print('000123123'.find('1'))
print('000123123'.rfind('1'))
print('***000123123***'.lstrip('*'))
print('***000123123***'.rstrip('*'))
print('华丽分割线'.center(50,'='))
print('华丽分割线'.ljust(50,'='))
print('华丽分割线'.rjust(50,'='))
print('123'.zfill(10))
print('%010d' % 123)
print('000\t123'.expandtabs(30))
print('AbC'.swapcase())
print('四'.isdigit())
print('四'.isdecimal())
print('四'.isnumeric()) # True
print('肆'.isnumeric()) # True
print('Ⅳ'.isnumeric()) # True
print('a_1'.isidentifier())
print('ABCc'.isupper())
print('ABCc'.islower())
print('Aooc Abc Aaa'.istitle())
print(' \n\r\t'.isspace())
