精心整理了100+Python字符串常用操作，收藏备用！

精心整理了100+Python字符串常用操作，收藏备用！

字符串作为平时使用最多的数据类型，其常用的操作我们还是很有必要熟记于心的，本文整理了多种字符串的操作的案例，还是非常用心，记得点赞收藏哦

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字符串切片操作检查字符串是否为空计算字符串中字符出现次数的多种方法将 String 变量转换为 float、int 或 boolean向字符串填充或添加零的不同方法去掉字符串中的 space 字符生成N个字符的随机字符串以不同的方式反转字符串将 Camel Case 转换为 Snake Case 并更改给定字符串中特定字符的大小写检查给定的字符串是否是 Python 中的回文字符串检查字符串是否以列表中的一个字符串结尾在字符串中应用查找模式如果是 Python 中的反斜杠，则删除最后一个字符在Python中拆分字符串而不丢失拆分字符从字符串 Python 中提取大写和小写字符如何在 Python 中比较字符串的索引是否相等在每个第 4 个字符上添加空格在 Python 中以多行方式连接字符串在 Python 中将多个变量附加到列表中将字符串拆分为 Python 中的字符列表如何在 Python 中小写字符串通过多个标点符号分割字符串Python 字符串填充在 Python 中检查两个字符串是否包含相同的字符在 Python 中查找给定字符串中的整个单词查找所有出现的子字符串在 Python 中去除所有开头在Python中的正斜杠上拆分字符串和结尾标点符号用 Python 中的正斜杠上拆分字符串根据 Python 中的索引位置将字符串大写检查字符串中的所有字符是否都是Python中的数字为什么使用'=='或'is'比较字符串有时会产生不同的结果如何在 Python 中为字符串添加 X 个空格如何在Python中替换字符串中的特定字符串实例如何连接两个变量，一个是字符串，另一个是 Python 中的 int在 Python 中的反斜杠上拆分字符串在Python中随机大写字符串中的字母在单词处拆分字符串并且或不保留分隔符在 Python 中填充 n 个字符检查变量是否等于一个字符串或另一个字符串Python字符串格式化固定宽度在Python中查找字符串中字符的所有位置在Python中从左右修剪指定数量的空格在Python中按字符串中字符的位置拆分字符串将Python字符串中的第一个和最后一个字母大写检查字符串是否以Python中的给定字符串或字符结尾如何在 Python 中比较两个字符串在Python中将整数格式化为带有前导零的字符串在Python中替换字符串的多个子字符串Python字符串替换字符在Python中查找字符串中所有出现的单词的所有索引在 Python 中将字符串中每个单词的首字母大写仅在 Python 中的双引号后拆分字符串在 Python 中以字节为单位获取字符串的大小在 Python 中比较字符串中的字符在 Python 中的括号和字符串之间添加空格在 Python 中删除开头和结尾空格在 Python 中拆分字符串以获得第一个值在 Python 中检查字符串是大写、小写还是混合大小写Python计数字符串出现在给定字符串中在 Python3 中用前导零填充字符串在 Python 中检查两个字符串是否包含相同的字母和数字在Python中的字符串中的字符之间添加空格的有效方法在Python中查找字符串中最后一次出现的子字符串的索引在 Python 中将字符串大写拆分非字母数字并在 Python 中保留分隔符计算Python中字符串中大写和小写字符的数量在 Python 中将字符串与枚举进行比较Python中的段落格式从 Python 中的某个索引替换字符如何连接 str 和 int 对象仅在 Python 中将字符串拆分为两部分将大写字符串转换为句子大小写在标点符号上拆分字符串在 Python 中比较字符串用零填充数字字符串找到两个字符串之间的差异位置Python填充字符串到固定长度Python中的字符串查找示例删除字符串中的开头零和结尾零Python在换行符上拆分将字符串中的每个第二个字母大写在 Python 中查找一个月的最后一个营业日或工作日比较两个字符串中的单个字符在 Python 中多次显示字符串Python 从头开始替换字符串在 Python 中连接字符串和变量值在每个下划线处拆分字符串并在第 N 个位置后停止Python 中列表中第一个单词的首字母大写如何在 Python 字符串中找到第一次出现的子字符串不同长度的 Python 填充字符串Python 比较两个字符串保留一端的差异如何用 Python 中的一个字符替换字符串中的所有字符在字符串中查找子字符串并在 Python 中返回子字符串的索引从 Python 中的字符串中修剪特定的开头和结尾字符在 Python 中按长度将字符串拆分为字符串如何在 Python 中将字符串的第三个字母大写将制表符大小设置为指定的空格数将两个字符串与某些字符进行比较字符串格式化填充负数单独替换字符串中的第一个字符连接固定字符串和变量将字符串拆分为多个字符串在 Python 中将字符串大写将字节字符串拆分为单独的字节用空格填写 Python 字符串比较两个字符串并检查它们共有多少个字符在 Python 中的数字和字符串之间添加空格如何在 Python 中去除空格字符串中最后一次出现的分隔符处拆分字符串在Python中将字符串的最后一个字母大写使用指定字符居中对齐字符串格式字符串中动态计算的零填充在 Python 中使用 string.replace()在 Python 中获取字符的位置Python字符串替换多次出现在索引后找到第一次出现的字符在 Python 中将字符串更改为大写在 Python 中拆分具有多个分隔符的字符串在 Python 中获取字符串的大小Python中的字符串比较 is vs ==每当数字与非数字相邻时，Python 正则表达式都会添加空格在 Python 中仅按第一个空格拆分字符串在Python中将字符串中的一些小写字母更改为大写将字符串拆分为具有多个单词边界分隔符的单词检查一个字符串在 Python 中是否具有相同的字符在多个分隔符或指定字符上拆分字符串将一个字符串附加到另一个字符串在 Python 中遍历字符串从 Python 中的字符串中去除标点符号将列表转换为字符串将 jsON 转换为字符串对字符串列表进行排序在 Python 中检查字符串是否以 XXXX 开头在 Python 中将两个字符串网格或交错在一起的不同方法

字符串切片操作

test = "Python Programming"print("String: ", test) # First one characterfirst_character = test[:1]print("First Character: ", first_character) # Last one characterlast_character = test[-1:]print("Last Character: ", last_character) # Everything except the first one characterexcept_first = test[1:]print("Except First Char.: ", except_first) # Everything except the last one characterexcept_last = test[:-1]print("Except First Char.: ", except_last) # Everything between first and last two characterbetween_two = test[2:-2]print("Between two character: ", between_two) # Skip one characterskip_one = test[0:18:2] # [start:stop:step]print("Skip one character: ", skip_one) # Reverse Stringreverse_str = test[::-1]print("Reverse String: ", reverse_str)

Output:

String: Python ProgrammingFirst Character: PLast Character: gExcept First Char.: ython ProgrammingExcept First Char.: Python ProgramminBetween two character: thon ProgrammiSkip one character: Pto rgamnReverse String: gnimmargorP nohtyP

检查字符串是否为空

import refrom collections import Counter sentence = 'Canada is located in the northern part of North America'# Example Icounter = len(re.findall("a", sentence))print(counter) # Example IIcounter = sentence.count('a')print(counter) # Example IIIcounter = Counter(sentence)print(counter['a'])

Output:

EmptyEmptyEmpty

计算字符串中字符出现次数的多种方法

import refrom collections import Counter sentence = 'Canada is located in the northern part of North America'# Example Icounter = len(re.findall("a", sentence))print(counter) # Example IIcounter = sentence.count('a')print(counter) # Example IIIcounter = Counter(sentence)print(counter['a'])

Output:

666

将 String 变量转换为 float、int 或 boolean

# String to Floatfloat_string = "254.2511"print(type(float_string)) string_to_float = float(float_string)print(type(string_to_float)) # String to Integerint_string = "254"print(type(int_string)) string_to_int = int(int_string)print(type(string_to_int)) # String to Booleanbool_string = "True"print(type(bool_string)) string_to_bool = bool(bool_string)print(type(string_to_bool))

Output:

class 'str'class 'float>class 'str'class 'int'class 'str'class 'bool'

向字符串填充或添加零的不同方法

num = 7 print('{0:0>5d}'.format(num)) # leftprint('{0:0<5d}'.format(num)) # right print('{:05d}'.format(num)) print("%0*d" % (5, num))print(format(num, "05d")) temp = 'test'print(temp.rjust(10, '0'))print(temp.ljust(10, '0'))

Output:

0000770000000070000700007000000testtest000000

去掉字符串中的 space 字符

string_var = " \t a string example\n\t\r "print(string_var) string_var = string_var.lstrip() # trim white space from leftprint(string_var) string_var = " \t a string example\t "string_var = string_var.rstrip() # trim white space from rightprint(string_var) string_var = " \t a string example\t "string_var = string_var.strip() # trim white space from both sideprint(string_var)

Output:

a string examplea string example a string examplea string example

生成N个字符的随机字符串

import stringimport random def string_generator(size): chars = string.ascii_uppercase + string.ascii_lowercase return ''.join(random.choice(chars) for _ in range(size)) def string_num_generator(size): chars = string.ascii_lowercase + string.digits return ''.join(random.choice(chars) for _ in range(size)) # Random Stringtest = string_generator(10)print(test) # Random String and Numbertest = string_num_generator(15)print(test)

Output:

acpPTojXetqmpah72cjb83eqd

以不同的方式反转字符串

test_string = 'Python Programming' string_reversed = test_string[-1::-1]print(string_reversed) string_reversed = test_string[::-1]print(string_reversed) # String reverse logicallydef string_reverse(text): r_text = '' index = len(text) - 1 while index >= 0: r_text += text[index] index -= 1 return r_text print(string_reverse(test_string))

Output:

gnimmargorP nohtyPgnimmargorP nohtyPgnimmargorP nohtyP

将 Camel Case 转换为 Snake Case 并更改给定字符串中特定字符的大小写

import re def convert(oldstring): s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', oldstring) return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower() # Camel Case to Snake Caseprint(convert('CamelCase'))print(convert('CamelCamelCase'))print(convert('getHTTPResponseCode'))print(convert('get2HTTPResponseCode')) # Change Case of a particular charactertext = "python programming"result = text[:1].upper() + text[1:7].lower() \ + text[7:8].upper() + text[8:].lower()print(result) text = "Kilometer"print(text.lower()) old_string = "hello python"new_string = old_string.capitalize()print(new_string) old_string = "Hello Python"new_string = old_string.swapcase()print(new_string)

Output:

camel_casecamel_camel_caseget_ProgrammingkilometerHello pythonhELLO pYTHON

检查给定的字符串是否是 Python 中的回文字符串

import re Continue = 1Quit = 2 def main(): choice = 0 while choice != Quit: # Display the menu. display_menu() # Constant to assume string is Palindrome is_palindrome = True # Get the user's choice. choice = int(input('\nEnter your choice: ')) # Perform the selected action. if choice == Continue: line = input("\nEnter a string: ") str_lower = re.sub("[^a-z0-9]", "", line.lower()) for i in range(0, len(str_lower)//2): if str_lower[i] != str_lower[len(str_lower) - i - 1]: is_palindrome = False if is_palindrome: print(line, "is a palindrome") else: print(line, "is not a palindrome") else: print('Thank You.') def display_menu(): print('\n*******MENU*******') print('1) Continue') print('2) Quit') main()

Output:

*******MENU*******1) Continue2) QuitEnter your choice: 1Enter a string: A dog! A panic in a pagoda!A dog! A panic in a pagoda! is a palindrome*******MENU*******1) Continue2) QuitEnter your choice: 1Enter a string: CivicCivic is a palindrome*******MENU*******1) Continue2) QuitEnter your choice: 1Enter a string: Python vs JavaPython vs Java is not a palindrome*******MENU*******1) Continue2) QuitEnter your choice: 2Thank You.

检查字符串是否以列表中的一个字符串结尾

str_list = ['aaa', 'bbb', 'ccc', 'ddd'] # list of itemsstr_test = 'testccc' # string need to test for str_item in str_list: if str_test.endswith(str_item): print("found") break # loop ends when result found else: print("not found")

Output:

not foundnot foundfound

在字符串中应用查找模式

import res1 = 'abccba's2 = 'abcabc's3 = 'canadajapanuaeuaejapancanada'p = '123321'def match(s, p): nr = {} regex = [] for c in p: if c not in nr: regex.append('(.+)') nr[c] = len(nr) + 1 else: regex.append('\\%d' % nr[c]) return bool(re.match(''.join(regex) + '$', s))print(match(s1, p))print(match(s2, p))print(match(s3, p))

Output:

TrueFalseTrue

如果是 Python 中的反斜杠，则删除最后一个字符

x = 'Canada\\'print(x.rstrip('\\'))

Output:

Canada

在Python中拆分字符串而不丢失拆分字符

import restring = 'canada-japan-india'print(re.split(r'(\-)', string))

Output:

['canada', '-', 'japan', '-', 'india']

从字符串 Python 中提取大写和小写字符

string = "asdfHRbySFss"uppers = [l for l in string if l.isupper()]print (''.join(uppers))lowers = [l for l in string if l.islower()]print (''.join(lowers))

Output:

HRSFasdfbyss

如何在 Python 中比较字符串的索引是否相等

myString = 'AAABBB'for idx, char in enumerate(myString, ): if idx + 1 == len(myString): break if char == myString[idx + 1]: print(idx, char, myString[idx + 1])

Output:

0 A A1 A A3 B B4 B B

在每个第 4 个字符上添加空格

string = 'Test5412Test8745Test'print([string[i:i + 4] for i in range(0, len(string), 4)])

Output:

['Test', '5412', 'Test', '8745', 'Test']

在 Python 中以多行方式连接字符串

str1 = "This is a demo string"str2 = "This is another demo string"strz = ("This is a line\n" + str1 + "\n" + "This is line 2\n" + str2 + "\n" + "This is line 3\n")print(strz)

Output:

This is a lineThis is a demo stringThis is line 2This is another demo stringThis is line 3

在 Python 中将多个变量附加到列表中

volumeA = 100volumeB = 20volumeC = 10vol1 = []vol2 = []vol1.extend((volumeA, volumeB, volumeC))vol2 += [val for name, val in globals().items() if name.startswith('volume')]print(vol1)print(vol2)

Output:

[100, 20, 10][100, 20, 10]

将字符串拆分为 Python 中的字符列表

s = 'canada'l = list(s)print(l)

Output:

['c', 'a', 'n', 'a', 'd', 'a']

如何在 Python 中小写字符串

text = ['Canada', 'JAPAN']text = [txt.lower() for txt in text]print(text)

Output:

['canada', 'japan']

通过多个标点符号分割字符串

import res = 'a,b,c d!e.f\ncanada\tjapan&germany' l = re.split('[?.,\n\t&! ]', s) for i in l: print(i)

Output:

abcdefcanadajapangermany

Python 字符串填充

lines_of_text = [ (123, 5487, 'Testing', 'Billy', 'Jones'), (12345, 100, 'Test', 'John M', 'Smith')]for mytuple in lines_of_text: name = '{}, {}'.format(mytuple[4], mytuple[3]) value = '$' + str(mytuple[1]) print('{name:<20} {id:>8} {test:<12} {value:>8}'.format( name=name, id=mytuple[0], test=mytuple[2], value=value) )

Output:

Jones, Billy 123 Testing $5487Smith, John M 12345 Test $100

在 Python 中检查两个字符串是否包含相同的字符

str1 = 'caars'str2 = 'rats'str3 = 'racs'print(set(str1)==set(str2))print(set(str1)==set(str3))

Output:

FalseTrue

在 Python 中查找给定字符串中的整个单词

def contains_word(s, w): return (' ' + w + ' ') in (' ' + s + ' ')result = contains_word('those who seek shall find', 'find')print(result)result = contains_word('those who seek shall find', 'finds')print(result)

Output:

TrueFalse

查找所有出现的子字符串

import reaString = 'this is a string where the substring "is" is repeated several times'print([(a.start(), a.end()) for a in list(re.finditer('is', aString))])

Output:

[(2, 4), (5, 7), (38, 40), (42, 44)]

在 Python 中去除所有开头在Python中的正斜杠上拆分字符串和结尾标点符号

from string import punctuations = '.$958-5-Canada,#'print(s.strip(punctuation))

Output:

958-5-Canada

用 Python 中的正斜杠上拆分字符串

s = 'canada/japan/australia'l = s.split('/') print(l)

Output:

['canada', 'japan', 'australia']

根据 Python 中的索引位置将字符串大写

def capitalize(s, ind): split_s = list(s) for i in ind: try: split_s[i] = split_s[i].upper() except IndexError: print('Index out of range : ', i) return "".join(split_s)print(capitalize("abracadabra", [2, 6, 9, 10, 50]))

Output:

Index out of range : 50abRacaDabRA

检查字符串中的所有字符是否都是Python中的数字

a = "1000"x = a.isdigit()print(x)b = "A1000"x = b.isdigit()print(x)

Output:

TrueFalse

为什么使用'=='或'is'比较字符串有时会产生不同的结果

a = 'canada'b = ''.join(['ca', 'na', 'da'])print(a == b)print(a is b)a = [1, 2, 3]b = [1, 2, 3]print(a == b)print(a is b)c = bprint(c is b)

Output:

TrueFalseTrueFalseTrue

如何在 Python 中为字符串添加 X 个空格

print('canada'.ljust(10) + 'india'.ljust(20) + 'japan')

Output:

canada india japan

如何在Python中替换字符串中的特定字符串实例

def nth_replace(str,search,repl,index): split = str.split(search,index+1) if len(split)<=index+1: return str return search.join(split[:-1])+repl+split[-1]str1 = "caars caars caars"str2 = nth_replace(str1, 'aa', 'a', 1)print(str2)

Output:

caars cars caars

如何连接两个变量，一个是字符串，另一个是 Python 中的 int

int1 = 10str1 = 'test'print(str(int1) + str1)

Output:

10test

在 Python 中的反斜杠上拆分字符串

s = r'canada\japan\australia'l = s.split('\\')print(l)

Output:

['canada', 'japan', 'australia']

在Python中随机大写字符串中的字母

from random import choicex = "canada japan australia"print(''.join(choice((str.upper, str.lower))(c) for c in x))

Output:

CANaDA JaPan auStRALIa

在单词处拆分字符串并且或不保留分隔符

import restring = "Canada AND Japan NOT Audi OR BMW"l = re.split(r'(AND|OR|NOT)', string)print(l)

Output:

['Canada ', 'AND', ' Japan ', 'NOT', ' Audi ', 'OR', ' BMW']

在 Python 中填充 n 个字符

def header(txt: str, width=30, filler='*', align='c'): assert align in 'lcr' return {'l': txt.ljust, 'c': txt.center, 'r': txt.rjust}[align](width, filler) print(header("Canada"))print(header("Canada", align='l'))print(header("Canada", align='r'))

Output:

************Canada************Canada************************************************Canada

检查变量是否等于一个字符串或另一个字符串

x = 'canada'if x in ['canada', 'japan', 'germany', 'australia']: print("Yes")

Output:

true

Python字符串格式化固定宽度

num1 = 0.04154721841num2 = 10.04154721841num3 = 1002.04154721841print "{0:<12.11g}".format(num1)[:12]print "{0:<12.11g}".format(num2)[:12]print "{0:<12.11g}".format(num3)[:12]

Output:

100.0415490.0415987412.8878877

在Python中查找字符串中字符的所有位置

test = 'canada#japan#uae'c = '#'print([pos for pos, char in enumerate(test) if char == c])

Output:

[6, 12]

在Python中从左右修剪指定数量的空格

def trim(text, num_of_leading, num_of_trailing): text = list(text) for i in range(num_of_leading): if text[i] == " ": text[i] = "" else: break for i in range(1, num_of_trailing+1): if text[-i] == " ": text[-i] = "" else: break return ''.join(text)txt1 = " Candada "print(trim(txt1, 1, 1))print(trim(txt1, 2, 3))print(trim(txt1, 6, 8))

Output:

Candada Candada Candada

在Python中按字符串中字符的位置拆分字符串

str = 'canadajapan'splitat = 6l, r = str[:splitat], str[splitat:]print(l)print(r)

Output:

canadajapan

将Python字符串中的第一个和最后一个字母大写

string = "canada"result = string[0:1].upper() + string[1:-1].lower() + string[-1:].upper()print(result)

Output:

CanadA

检查字符串是否以Python中的给定字符串或字符结尾

txt = "Canada is a great country"x = txt.endswith("country")print(x)

Output:

True

如何在 Python 中比较两个字符串

str1 = "Canada"str2 = "Canada"print(str1 is str2) # Trueprint(str1 == str2) # True string1 = ''.join(['Ca', 'na', 'da'])string2 = ''.join(['Can', 'ada'])print(string1 is string2) # Falseprint(string1 == string2) # True

Output:

TrueTrueFalseTrue

在Python中将整数格式化为带有前导零的字符串

x = 4x = str(x).zfill(5)print(x)

Output:

00004

在Python中替换字符串的多个子字符串

s = "The quick brown fox jumps over the lazy dog"for r in (("brown", "red"), ("lazy", "quick")): s = s.replace(*r)print(s)

Output:

The quick red fox jumps over the quick dog

Python字符串替换字符

s = "The quick brown fox jumps over the lazy dog"for r in (("brown", "red"), ("lazy", "quick")): s = s.replace(*r)print(s)

Output:

The quick red fox jumps over the quick dog

在Python中查找字符串中所有出现的单词的所有索引

import resentence = 'this is a sentence this this'word = 'this'for match in re.finditer(word, sentence): print(match.start(), match.end())

Output:

0 419 2324 28

在 Python 中将字符串中每个单词的首字母大写

import stringx = "they're bill's friends from the UK"x = string.capwords(x)print(x)x = x.title()print(x)

Output:

They're Bill's Friends From The UkThey'Re Bill'S Friends From The Uk

仅在 Python 中的双引号后拆分字符串

s = '"Canada", "Japan", "Germany", "Russia"'l = ['"{}"'.format(s) for s in s.split('"') if s not in ('', ', ')]for item in l: print(item)

Output:

"Canada""Japan""Germany""Russia"

在 Python 中以字节为单位获取字符串的大小

string1 = "Canada"print(len(string1.encode('utf-16')))

Output:

10

在 Python 中比较字符串中的字符

myString = 'AAABBB'for idx, char in enumerate(myString, ): if idx + 1 == len(myString): break if char == myString[idx + 1]: print(idx, char, myString[idx + 1])

Output:

0 A A1 A A3 B B4 B B

在 Python 中的括号和字符串之间添加空格

import retest = "example(test)"test2 = "example(test)example"test3 = "(test)example"test4 = "example (test) example"for i in [test, test2, test3, test4]: print(re.sub(r"[^\S]?(\(.*?\))[^\S]?", r" \1 ", i).strip())

Output:

example (test)example (test) example(test) exampleexample (test) example

在 Python 中删除开头和结尾空格

s = ' canada 'print(s.strip())

Output:

canada

在 Python 中拆分字符串以获得第一个值

s = 'canada-japan-australia'l = s.split('-')[0]print(l)string = 'canada-japan-australia'print(string[:string.index('-')])

Output:

canadacanada

在 Python 中检查字符串是大写、小写还是混合大小写

words = ['The', 'quick', 'BROWN', 'Fox', 'jumped', 'OVER', 'the', 'Lazy', 'DOG']print([word for word in words if word.islower()])print([word for word in words if word.isupper()])print([word for word in words if not word.islower() and not word.isupper()])

Output:

['quick', 'jumped', 'the']['BROWN', 'OVER', 'DOG']['The', 'Fox', 'Lazy']

Python计数字符串出现在给定字符串中

txt = "I love Canada, Canada is one of the most impressive countries in the world. Canada is a great country." x = txt.count("Canada") print(x)

Output:

3

在 Python3 中用前导零填充字符串

hour = 4minute = 3print("{:0>2}:{:0>2}".format(hour, minute))print("{:0>3}:{:0>5}".format(hour, minute))print("{:0<3}:{:0<5}".format(hour, minute))print("{:$<3}:{:#<5}".format(hour, minute))

Output:

04:03004:00003400:300004$$:3####

在 Python 中检查两个字符串是否包含相同的字母和数字

from string import ascii_letters, digitsdef compare_alphanumeric(first, second): for character in first: if character in ascii_letters + digits and character not in second: return False return Truestr1 = 'ABCD'str2 = 'ACDB'print(compare_alphanumeric(str1, str2))str1 = 'A45BCD'str2 = 'ACD59894B'print(compare_alphanumeric(str1, str2))str1 = 'A45BCD'str2 = 'XYZ9887'print(compare_alphanumeric(str1, str2))

Output:

TrueTrueFalse

在Python中的字符串中的字符之间添加空格的有效方法

s = "CANADA"print(" ".join(s))print("-".join(s))print(s.replace("", " ")[1: -1])

Output:

C A N A D AC-A-N-A-D-AC A N A D A

在Python中查找字符串中最后一次出现的子字符串的索引

s = 'What is Canada famous for?'print(s.find('f'))print(s.index('f'))print(s.rindex('f'))print(s.rfind('f'))

Output:

15152222

在 Python 中将字符串大写

x = 'canada'x = x.capitalize() print(x)

Output:

Canada

拆分非字母数字并在 Python 中保留分隔符

import res = "65&Can-Jap#Ind^UK"l = re.split('([^a-zA-Z0-9])', s)print(l)

Output:

['65', '&', 'Can', '-', 'Jap', '#', 'Ind', '^', 'UK']

计算Python中字符串中大写和小写字符的数量

string = "asdfHRbySFss"uppers = [l for l in string if l.isupper()]print(len(uppers))lowers = [l for l in string if l.islower()]print(len(lowers))

Output:

48

在 Python 中将字符串与枚举进行比较

from enum import Enum, autoclass Signal(Enum): red = auto() green = auto() orange = auto() def equals(self, string): return self.name == stringbrain_detected_colour = "red"print(Signal.red.equals(brain_detected_colour))brain_detected_colour = "pink"print(Signal.red.equals(brain_detected_colour))

Output:

TrueFalse

Python中的段落格式

import textwraphamlet = '''\Lorum ipsum is the traditional Latin placeholder text, used when a designer needs a chunk of text for dummying up a layout.Journo Ipsum is like that, only using some of the most common catchphrases, buzzwords, and bon mots of the future-of-news crowd.Hit reload for a new batch. For entertainment purposes only.'''wrapper = textwrap.TextWrapper(initial_indent='\t' * 1, subsequent_indent='\t' * 2, width=40)for para in hamlet.splitlines(): print(wrapper.fill(para))

Output:

Lorum ipsum is the traditional Latin placeholder text, used when a designer needs a chunk of text for dummying up a layout. Journo Ipsum is like that, only using some of the most common catchphrases, buzzwords, and bon mots of the future- of-news crowd. Hit reload for a new batch. For entertainment purposes only.

从 Python 中的某个索引替换字符

def nth_replace(str,search,repl,index): split = str.split(search,index+1) if len(split)<=index+1: return str return search.join(split[:-1])+repl+split[-1]str1 = "caars caars caars"str2 = nth_replace(str1, 'aa', 'a', 1)print(str2)

Output:

caars cars caars

如何连接 str 和 int 对象

i = 123a = "foobar"s = a + str(i)print(s)

Output:

foobar123

仅在 Python 中将字符串拆分为两部分

s = 'canada japan australia'l = s.split(' ', 1)print(l)

Output:

['canada', 'japan australia']

将大写字符串转换为句子大小写

text = ['CANADA', 'JAPAN']text = [txt.capitalize() for txt in text]print(text)

Output:

['Canada', 'Japan']

在标点符号上拆分字符串

string = 'a,b,c d!e.f\ncanada\tjapan&germany'identifiers = '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~\n\t 'listitems = "".join((' ' if c in identifiers else c for c in string)).split()for item in listitems: print(item)

Output:

abcdefcanadajapangermany

在 Python 中比较字符串

str1 = "Canada"str2 = "Canada"print(str1 is str2) # Trueprint(str1 == str2) # True string1 = ''.join(['Ca', 'na', 'da'])string2 = ''.join(['Can', 'ada'])print(string1 is string2) # Falseprint(string1 == string2) # True

Output:

TrueTrueFalseTrue

用零填充数字字符串

num = 123print('{:<08d}'.format(num))print('{:>08d}'.format(num))string = '123'print(string.ljust(8, '0'))print(string.rjust(8, '0'))print(string[::-1].zfill(8)[::-1])

Output:

1230000000000123123000000000012312300000

找到两个字符串之间的差异位置

def dif(a, b): return [i for i in range(len(a)) if a[i] != b[i]]print(dif('stackoverflow', 'stacklavaflow'))

Output:

[5, 6, 7, 8]

Python填充字符串到固定长度

number = 4print(f'{number:05d}') # (since Python 3.6), orprint('{:05d}'.format(number)) # orprint('{0:05d}'.format(number))print('{n:05d}'.format(n=number)) # or (explicit `n` keyword arg. selection)print(format(number, '05d'))

Output:

000040000400004000040000400004

Python中的字符串查找示例

import retext = 'This is sample text to test if this pythonic '\ 'program can serve as an indexing platform for '\ 'finding words in a paragraph. It can give '\ 'values as to where the word is located with the '\ 'different examples as stated'find_the_word = re.finditer('as', text)for match in find_the_word: print('start {}, end {}, search string \'{}\''. format(match.start(), match.end(), match.group()))

Output:

start 63, end 65, search string 'as'start 140, end 142, search string 'as'start 200, end 202, search string 'as'

删除字符串中的开头零和结尾零

list_num = ['000231512-n', '1209123100000-n00000', 'alphanumeric0000', '000alphanumeric'] print([item.strip('0') for item in list_num]) # Remove leading + trailing '0'print([item.lstrip('0') for item in list_num]) # Remove leading '0'print([item.rstrip('0') for item in list_num]) # Remove trailing '0'

Output:

['231512-n', '1209123100000-n', 'alphanumeric', 'alphanumeric']['231512-n', '1209123100000-n00000', 'alphanumeric0000', 'alphanumeric']['000231512-n', '1209123100000-n', 'alphanumeric', '000alphanumeric']

Python在换行符上拆分

s = 'line 1\nline 2\nline without newline'l = s.splitlines(True)print(l)

Output:

['line 1\n', 'line 2\n', 'line without newline']

将字符串中的每个第二个字母大写

s = 'canada's = "".join([x.upper() if i % 2 != 0 else x for i, x in enumerate(s)])print(s)

Output:

cAnAdA

在 Python 中查找一个月的最后一个营业日或工作日

import calendardef last_business_day_in_month(year: int, month: int) return max(calendar.monthcalendar(year, month)[-1:][0][:5])print(last_business_day_in_month(2021, 1))print(last_business_day_in_month(2021, 2))print(last_business_day_in_month(2021, 3))print(last_business_day_in_month(2021, 4))print(last_business_day_in_month(2021, 5))

Output:

2926313031

比较两个字符串中的单个字符

def compare_strings(a, b): result = True if len(a) != len(b): print('string lengths do not match!') for i, (x, y) in enumerate(zip(a, b)): if x != y: print(f'char miss-match {x, y} in element {i}') result = False if result: print('strings match!') return resultprint(compare_strings("canada", "japan"))

Output:

string lengths do not match!char miss-match ('c', 'j') in element 0char miss-match ('n', 'p') in element 2char miss-match ('d', 'n') in element 4False

在 Python 中多次显示字符串

print('canada' * 3)print(*3 * ('canada',), sep='-')

Output:

canadacanadacanadacanada-canada-canada

Python从头开始替换字符串

def nth_replace(s, old, new, occurrence): li = s.rsplit(old, occurrence) return new.join(li)str1 = "caars caars caars caars caars"str2 = nth_replace(str1, 'aa', 'a', 1)print(str2)str2 = nth_replace(str1, 'aa', 'a', 2)print(str2)str2 = nth_replace(str1, 'aa', 'a', 3)print(str2)

Output:

caars caars caars caars carscaars caars caars cars carscaars caars cars cars cars

在 Python 中连接字符串和变量值

year = '2020'print('test' + str(year))print('test' + year.__str__())

Output:

test2020test2020

在每个下划线处拆分字符串并在第 N 个位置后停止

s = 'canada_japan_australia_us_uk'l = s.split('_', 0)print(l)l = s.split('_', 1)print(l)l = s.split('_', 2)print(l)

Output:

['canada_japan_australia_us_uk']['canada', 'japan_australia_us_uk']['canada', 'japan', 'australia_us_uk']

Python中列表中第一个单词的首字母大写

text = ['johnny rotten', 'eddie vedder', 'kurt kobain', 'chris cornell', 'micheal phillip jagger']text = [txt.capitalize() for txt in text]print(text)

Output:

['Johnny rotten', 'Eddie vedder', 'Kurt kobain', 'Chris cornell', 'Micheal phillip jagger']

如何在 Python 字符串中找到第一次出现的子字符串

test = 'Position of a character'print(test.find('of'))print(test.find('a'))

Output:

912

不同长度的Python填充字符串

data = [1148, 39, 365, 6, 56524]for element in data: print("{:>5}".format(element))

Output:

1148 39 365 656524

Python比较两个字符串保留一端的差异

def after(s1, s2): index = s1.find(s2) if index != -1 and index + len(s2) < len(s1): return s1[index + len(s2):] else: return Nones1 = "canada"s2 = "can"print(after(s1, s2))

Output:

ada

如何用Python中的一个字符替换字符串中的所有字符

test = 'canada'print('$' * len(test))

Output:

$$$$$$

在字符串中查找子字符串并在 Python 中返回子字符串的索引

def find_str(s, char): index = 0 if char in s: c = char[0] for ch in s: if ch == c: if s[index:index + len(char)] == char: return index index += 1 return -1print(find_str("India Canada Japan", "Canada"))print(find_str("India Canada Japan", "cana"))print(find_str("India Canada Japan", "Uae"))

Output:

6-1-1

从 Python 中的字符串中修剪特定的开头和结尾字符

number = '+91 874854778'print(number.strip('+'))print(number.lstrip('+91'))

Output:

91 874854778 874854778

在 Python 中按长度将字符串拆分为字符串

string = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"x = 3res = [string[y - x:y] for y in range(x, len(string) + x, x)]print(res)

Output:

['ABC', 'DEF', 'GHI', 'JKL', 'MNO', 'PQR', 'STU', 'VWX', 'YZ']

如何在 Python 中将字符串的第三个字母大写

s = "xxxyyyzzz"# convert to lista = list(s)# change every third letter in place with a list comprehensiona[2::3] = [x.upper() for x in a[2::3]]# back to a strings = ''.join(a)print(s)

Output:

xxXyyYzzZ

将制表符大小设置为指定的空格数

txt = "Canada\tis\ta\tgreat\tcountry"print(txt)print(txt.expandtabs())print(txt.expandtabs(2))print(txt.expandtabs(4))print(txt.expandtabs(10))

Output:

Canada is a great countryCanada is a great countryCanada is a great countryCanada is a great countryCanada is a great country

将两个字符串与某些字符进行比较

str1 = "Can"str2 = "Canada"print(str1 in str2)print(str1.startswith(str2))print(str2.startswith(str1))print(str1.endswith(str2))str3 = "CAN"print(str3 in str2)

Output:

TrueFalseTrueFalseFalse

字符串格式化填充负数

n = [-2, -8, 1, -10, 40]num = ["{1:0{0}d}".format(2 if x >= 0 else 3, x) for x in n]print(num)

Output:

n = [-2, -8, 1, -10, 40]num = ["{1:0{0}d}".format(2 if x >= 0 else 3, x) for x in n]print(num)

单独替换字符串中的第一个字符

str1 = "caars caars caars"str2 = str1.replace('aa', 'a', 1)print(str2)

Output:

cars caars caars

连接固定字符串和变量

variable = 'Hello'print('This is the Test File ' + variable)variable = '10'print('This is the Test File ' + str(variable))

Output:

This is the Test File HelloThis is the Test File 10

将字符串拆分为多个字符串

s = 'str1, str2, str3, str4'l = s.split(', ') print(l)

Output:

['str1', 'str2', 'str3', 'str4']

在 Python 中将字符串大写

x = "canada japan australia"x = x[:1].upper() + x[1:]print(x)x= x.capitalize()print(x)x= x.title()print(x)

Output:

Canada japan australiaCanada japan australiaCanada Japan Australia

将字节字符串拆分为单独的字节

data = b'\x00\x00\x00\x00\x00\x00'info = [data[i:i + 2] for i in range(0, len(data), 2)]print(info)

Output:

[b'\x00\x00', b'\x00\x00', b'\x00\x00']

用空格填写 Python 字符串

string = 'Hi'.ljust(10)print(string)string = 'Hi'.rjust(10)print(string)string = '{0: ^20}'.format('Hi')print(string)string = '{message: >16}'.format(message='Hi')print(string)string = '{message: <16}'.format(message='Hi')print(string)string = '{message: <{width}}'.format(message='Hi', width=20)print(string)

Output:

Hi Hi Hi HiHi Hi

比较两个字符串并检查它们共有多少个字符

from collections import Counterdef shared_chars(s1, s2): return sum((Counter(s1) & Counter(s2)).values())print(shared_chars('car', 'carts'))

Output:

3

在 Python 中的数字和字符串之间添加空格

import res = "ABC24.00XYZ58.28PQR"s = re.sub("[A-Za-z]+", lambda group: " " + group[0] + " ", s)print(s.strip())

Output:

ABC 24.00 XYZ 58.28 PQR

如何在 Python 中去除空格

s = ' canada 'print(s.rstrip()) # For whitespace on the right side use rstrip.print(s.lstrip()) # For whitespace on the left side lstrip.print(s.strip()) # For whitespace from both side. s = ' \t canada 'print(s.strip('\t')) # This will strip any space, \t, \n, or \r characters from the left-hand side, right-hand side, or both sides of the string.

Output:

canadacanada canada canada

字符串中最后一次出现的分隔符处拆分字符串

s = 'canada-japan-australia-uae-india'l = s.rsplit('-', 1)[1]print(l)

Output:

india

在Python中将字符串的最后一个字母大写

string = "canada"result = string[:-1] + string[-1].upper()print(result)result = string[::-1].title()[::-1]print(result)

Output:

canadAcanadA

使用指定字符居中对齐字符串

txt = "canada"x = txt.center(20)print(x)

Output:

canada

格式字符串中动态计算的零填充

x = 4w = 5print('{number:0{width}d}'.format(width=w, number=x))

Output:

00004

在 Python 中使用 string.replace()

a = "This is the island of istanbul"print (a.replace("is" , "was", 1))print (a.replace("is" , "was", 2))print (a.replace("is" , "was"))

Output:

Thwas is the island of istanbulThwas was the island of istanbulThwas was the wasland of wastanbul

在 Python 中获取字符的位置

test = 'Position of a character'print(test.find('of'))print(test.find('a'))

Output:

912

Python字符串替换多次出现

s = "The quick brown fox jumps over the lazy dog"for r in (("brown", "red"), ("lazy", "quick")): s = s.replace(*r)print(s)

Output:

The quick red fox jumps over the quick dog

在索引后找到第一次出现的字符

string = 'This + is + a + string'x = string.find('+', 4)print(x)x = string.find('+', 10)print(x)

Output:

510

在 Python 中将字符串更改为大写

x = 'canada'x = x.upper()print(x)

Output:

CANADA

在 Python 中拆分具有多个分隔符的字符串

import rel = re.split(r'[$-]+', 'canada$-india$-japan$-uae')print(l)

Output:

['canada', 'india', 'japan', 'uae']

在 Python 中获取字符串的大小

string1 = "Canada"print(len(string1))string2 = " Canada"print(len(string2))string3 = "Canada "print(len(string3))

Output:

688

Python中的字符串比较 is vs ==

x = 'canada'y = ''.join(['ca', 'na', 'da'])print(x == y)print(x is y) x = [1, 2, 3]y = [1, 2, 3]print(x == y)print(x is y) z = yprint(z is y)

Output:

TrueFalseTrueFalseTrue

每当数字与非数字相邻时，Python 正则表达式都会添加空格

import retext = ['123', 'abc', '4x5x6', '7.2volt', '60BTU', '20v', '4*5', '24in', 'google.com-1.2', '1.2.3']pattern = r'(-?[0-9]+\.?[0-9]*)'for data in text: print(repr(data), repr( ' '.join(segment for segment in re.split(pattern, data) if segment)))

Output:

'123' '123''abc' 'abc''4x5x6' '4 x 5 x 6''7.2volt' '7.2 volt''60BTU' '60 BTU''20v' '20 v''4*5' '4 * 5''24in' '24 in''google.com-1.2' 'google.com -1.2''1.2.3' '1.2 . 3'

在 Python 中仅按第一个空格拆分字符串

s = 'canada japan australia'l = s.split(' ', 1)print(l)

Output:

['canada', 'japan australia']

在Python中将字符串中的一些小写字母更改为大写

indices = set([0, 7, 14, 18])s = "i love canada and japan"print("".join(c.upper() if i in indices else c for i, c in enumerate(s)))

Output:

I love Canada And Japan

将字符串拆分为具有多个单词边界分隔符的单词

import rethestring = "a,b,c d!e.f\ncanada\tjapan&germany"listitems = re.findall('\w+', thestring)for item in listitems: print(item)

Output:

abcdefcanadajapangermany

检查一个字符串在 Python 中是否具有相同的字符

str1 = 'caars'str2 = 'rats'str3 = 'racs'print(set(str1)==set(str2))print(set(str1)==set(str3))

Output:

FalseTrue

在多个分隔符或指定字符上拆分字符串

import re string_test = "Ethnic (279), Responses (3), 2016 Census - 25% Sample"print(re.findall(r"[\w']+", string_test)) def split_by_char(s, seps): res = [s] for sep in seps: s, res = res, [] for seq in s: res += seq.split(sep) return res print(split_by_char(string_test, [' ', '(', ')', ',']))

Output:

['Ethnic', '279', 'Responses', '3', '2016', 'Census', '25', 'Sample']['Ethnic', '', '279', '', '', 'Responses', '', '3', '', '', '2016', 'Census', '-', '25%', 'Sample']

将一个字符串附加到另一个字符串

# Example 1str1 = "Can"str2 = "ada"str3 = str1 + str2print(str3) # Example 2str4 = 'Ca'str4 += 'na'str4 += 'da'print(str4) # Example 3join_str = "".join((str1, str2))print(join_str) # Example 4str_add = str1.__add__(str2)print(str_add)

Output:

CanadaCanadaCanadaCanada

在 Python 中遍历字符串

# Example 1test_str = "Canada"for i, c in enumerate(test_str): print(i, c) print("------------------------") # Example 2indx = 0while indx < len(test_str): print(indx, test_str[indx]) indx += 1 print("------------------------")# Example 3for char in test_str: print(char)

Output:

0 C1 a2 n.......da

从 Python 中的字符串中去除标点符号

import stringimport re # Example 1s = "Ethnic (279), Responses (3), 2016 Census - 25% Sample"out = re.sub(r'[^\w\s]', '', s)print(out) # Example 2s = "Ethnic (279), Responses (3), 2016 Census - 25% Sample"for p in string.punctuation: s = s.replace(p, "")print(s) # Example 3s = "Ethnic (279), Responses (3), 2016 Census - 25% Sample"out = re.sub('[%s]' % re.escape(string.punctuation), '', s)print(out)

Output:

Ethnic 279 Responses 3 2016 Census 25 SampleEthnic 279 Responses 3 2016 Census 25 SampleEthnic 279 Responses 3 2016 Census 25 Sample

将列表转换为字符串

list_exp = ['Ca', 'na', 'da']print(type(list_exp)) # Example 1str_exp1 = ''.join(list_exp)print(type(str_exp1))print(str_exp1) # Example 2str_exp2 = ''.join(str(e) for e in list_exp)print(type(str_exp2))print(str_exp2) # Example 3str_exp3 = ''.join(map(str, list_exp))print(type(str_exp2))print(str_exp2)

Output:

class 'list'class 'str'Canadaclass 'str'Canadaclass 'str'Canada

将 JSON 转换为字符串

import json # list with dict a simple Json formatjson_exp = \ [{"id": "12", "name": "Mark"}, {"id": "13", "name": "Rock", "date": None}]print(type(json_exp)) str_conv = json.dumps(json_exp) # stringprint(type(str_conv))print(str_conv)

Output:

class 'list'class 'str'[{"id": "12", "name": "Mark"}, {"id": "13", "name": "Rock", "date": null}]

对字符串列表进行排序

# Example 1str_list = ["Japan", "Canada", "Australia"]print(str_list)str_list.sort()print(str_list) # Example 2str_list = ["Japan", "Canada", "Australia"]for x in sorted(str_list): print(x) # Example 3str_var = "Canada"strlist = sorted(str_var)print(strlist)

Output:

['Japan', 'Canada', 'Australia']['Australia', 'Canada', 'Japan']AustraliaCanadaJapan['C', 'a', 'a', 'a', 'd', 'n']

在 Python 中检查字符串是否以 XXXX 开头

import re exp_str = "Python Programming" # Example 1if re.match(r'^Python', exp_str): print(True)else: print(False) # Example 2result = exp_str.startswith("Python")print(result)

Output:

TrueTrue

在 Python 中将两个字符串网格或交错在一起的不同方法

str1 = "AAAA"str2 = "BBBBBBBBB" # Example 1mesh = "".join(i + j for i, j in zip(str1, str2))print("Example 1:", mesh) # Example 2min_len = min(len(str1), len(str2))mesh = [''] * min_len * 2mesh[::2] = str1[:min_len]mesh[1::2] = str2[:min_len]print("Example 2:", ''.join(mesh)) # Example 3mesh = ''.join(''.join(item) for item in zip(str1, str2))print("Example 3:", mesh) # Example 4min_len = min(len(str1), len(str2))mesh = [''] * min_len * 2mesh[::2] = str1[:min_len]mesh[1::2] = str2[:min_len]mesh += str1[min_len:] + str2[min_len:]print("Example 4:", ''.join(mesh))

Output:

Example 1: ABABABABExample 2: ABABABABExample 3: ABABABABExample 4: ABABABABBBBBB

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