python中字符串内置函数的用法总结

a='someword' 
 b=a.capitalize() 
 print(b) 
 —>Someword

a='someWORD' 
  b=a.casefold() 
  print(b) 
  c=a.lower() 
  print(c) 
  —>someword 
  —>someword

a='someword' 
  b=a.center(30,'*') 
  print(b)

a='somewordsomeword' 
 b=a.count(‘or') 
 print(b) 
 —>2

a='somewordsomeword' 
  b=a.startswith(‘sa') 
  c=a.endswith(‘ord') 
  print(b) 
  print(c) 
  —>False 
  —>True

a='somewordsomeword' 
  b=a.find(‘me') 
  print(b) 
  —>2

test='I am {name},age {a}' 
  v=test.format(name='alex',a=19) 
  print(v) 
  —>i am alex,age 19

test='iam{name},age{a}' 
  v=test.format_map({“name”:'alex',”a”:19}) 
  print(v) 
  —>i am alex,age 19

a='asdfs123*' 
  b=a.isalnum() 
  print(b) 
  —>False

a='asdfs123\t523fgbdf' 
 b=a.expandtabs(5) 
 print(b)
 —>asdfs123 523fgbdf

a='asdfsfgbdf' 
 b=a.isalpha() 
 print(b) 
 —>True

a='132132②二' 
  b=a.isdecimal() 
  c=a.isdigit() 
  d=a.isnumeric() 
  print(b) 
  print(c) 
  print(d) 
  —>False 
  —>False 
  —>True

a='sdfgdfg\t' 
 b=a.isprintable() 
 print(b) 
 —>False

a='dsvsdv' 
  b=a.isspace() 
  print(b) 
  —>False

a='follow uncased characters and lowercase characters only cased ones' 
  b=a.istitle() 
  print(b) 
  c=a.title() 
  print(c) 
  —>False 
  —>Follow Uncased Characters And Lowercase Characters Only Cased Ones

a='一二三四五六七' 
  print(a) 
  b='*' 
  c=b.join(a) 
  print(c) 
  —>一二三四五六七 
  —>一二三四五六七

a='hello' 
 b=a.ljust(20,'*') 
 c=a.rjust(20,'*') 
 print(b) 
 print(c) 
 —>hello*************** 
 —>***************hello

a='Hello' 
  b=a.islower() 
  c=a.lower() 
  print(b,c) 
  —>False hello

a='Hello' 
  b=a.isupper() 
  c=a.upper() 
  print(b,c) 
  —>False HELLO

a='Hello' 
  b=a.lstrip() 
  c=a.rstrip() 
  d=a.strip() 
  print(b) 
  print(c) 
  print(d) 
  —>Hello 
  —> Hello 
  —>Hello

a='asdgfrfbcvzxrentas' 
  b=str.maketrans(‘xdsa','1234') 
  c=a.translate(b) 
  print(c) 
  —> 432gfrfbcvz1rent43

a='helwloasvxcwaewc' 
  b=a.partition(‘w') 
  c=a.rpartition(‘w') 
  print(b) 
  print(c) 
  —>(‘hel', ‘w', ‘loasvxcwaewc') 
  —>(‘helwloasvxcwae', ‘w', ‘c')

a='helwloasvxcwaewc' 
  b=a.split(‘w',2) 
  c=a.rsplit(‘w') 
  print(b) 
  print(c) 
  —>[‘hel', ‘loasvxc', ‘aewc'] 
  —>[‘hel', ‘loasvxc', ‘ae', ‘c']

a='helwloas\nvxcwaewc\nafgasdfs' 
  b=a.splitlines() 
  c=a.splitlines(True) 
  print(b) 
  print(c) 
  —>[‘helwloas', ‘vxcwaewc', ‘afgasdfs'] 
  —>[‘helwloas\n', ‘vxcwaewc\n', ‘afgasdfs']

a='aefsfsfeeav' 
  b=a.startswith(‘ae') 
  c=a.endswith(‘av',1,9) 
  print(b) 
  print(c) 
  True 
  —>False

a='aefsfsfeeav' 
  b=a.swapcase() 
  print(b) 
  —>AEFSFSFEEAV