python字符串，,test = ‘ab

python字符串，,test = ‘ab

test = ‘abcdefghijklmnopqrstuvwxyz‘print(test)print(test[1:5])    #可以切片print(test.capitalize())  #首字母大写print(test.count(‘a‘))#计数print(test.center(50,‘-‘)) #美观打印print(test.encode(‘utf-8‘))#转码print(test.endswith(‘yz‘))  #判断结尾print(test.endswith(‘zz‘))  #判断结尾test = ‘a\tbcdefghijklmnopqrstuvwxyz‘ #\t是tab键print(test.expandtabs(tabsize=5)) #定义tab键的长度test = ‘abcdefghijklmnopqrstuvwxyz‘print(test.find(‘i‘)) #找到位置test ="My name is {name},I‘m {age} old."print(test.format(name =‘jack‘, age = 20)) #格式化输出print(test.format_map({‘name‘:‘rose‘,‘age‘:18})) #另一种格式化输出print(‘abc123‘.isalnum()) #是否数字字母print(‘abc123!@#‘.isalnum())#不包含符号print(‘abcABC‘.isalpha())#是否字母print(‘abcABC123‘.isalpha())#是否字母不含数字print(‘1a‘.isdecimal())#是否10进制print(‘10‘.isdigit())#是否数字print(‘aa‘.isidentifier())#是否是合法标识符print(‘a‘.islower())#是否小写print(‘123a‘.isnumeric())#是否纯数字print(‘ ‘.isspace())#是否空格print(‘My name is jack‘.istitle())#是否首字母全大写print(‘My name is jack‘.isprintable())#是否可以打印tty drive 不可以打印print(‘My name is jack‘.isupper())#是否全大写print(‘My name is jack‘.join(‘------‘))#分割组合  分割joni里面的，把前面的加进去print(‘+‘.join([‘1‘,‘2‘,‘3‘]))   #1+2+3print(test.ljust(50,‘*‘))  #用*在后面补齐50位print(test.rjust(50,‘*‘))  #用*在前面补齐50位print(‘jack‘.upper()) #全换大写print(‘Jack‘.lower()) #全换小写print(‘\n  test  \n‘) #\n是回车print(‘--‘)print(‘\n  test  \n‘.rstrip())  #去掉右边的空格和回车print(‘--‘)print(‘\n  test  \n‘.lstrip())#去掉左边的空格和回车print(‘--‘)print(‘\n  test  \n‘.split()) #去掉两边的空格和回车p = str.maketrans(‘abcdefg‘,‘1234567‘)   #明文替换print(‘jack‘.translate(p))print(‘jack adam‘.replace(‘a‘,‘A‘))   #替换print(‘jack adam‘.replace(‘a‘,‘A‘,2)) #替换几个print(‘jack adam‘.find(‘a‘)) #查找一个字符的位置print(‘jack adam‘.rfind(‘a‘))#查找某字符的最右的位置print(‘jack adam‘.split())# 用空格分成字符串print(‘jack adam‘.split(‘a‘))# 用a分成字符串 a就没了print(‘jack \nadam‘.splitlines())# 用换行分成字符串print(‘Jack Adam‘.swapcase())#大小写转换print(‘jack adam‘.title())#首字母大写print(‘jack adam‘.zfill(50))#用0填充50位

python字符串