(Common operation of str) Python learning content the next day

Common Operations for STR

2. Slice, index, number of characters

    name = "  AITG   " #  Span style= "COLOR: #008000" > output t  print  (name[2 ])  #   output ait  print  (Name[0:3 #   output 4  print  (Len ( Name) 

    

4. First letter Case
   

   " AITG " Print (Name.capitalize ())

6. All Letters lowercase

   " AITG " Print (Name.capitalize ()) # Output: AITG Print (Name.lower ()) # Output: AITG

8. Set the width and center the content

    name =  " AITG  "  print  (Name.center ( " #   "  #   output: # # # aitg###  

    

10. go to the string and look for the number of occurrences of the subsequence

     name = Span style= "COLOR: #800000" > " AITGAITGAITG   " print  (Name.count ( " a   "  #   output 3 times  print  (Name.count ( " a  " , 0,7 #   find 0-7-bit (does not contain 7th digit) occurrences  #   output 2 times  

     

12. find string beginning with | end

     name =  " AITG  "  Span style= "COLOR: #000000" > Find the character ending with  print  (Name.endswith ( " g  "   #   Span style= "COLOR: #0000ff" >print  (Name.startswith ( " a  "   #   output result: False or True  

     

14. string according to \ t segmentation

     name = "  name\tmail\tpass\nname\tmail\tpass\nname\tmail\tpass   " print  (Name.expandtabs (10 #   by \ t segmentation  #   output  #   name Mail pass  #   name Mail pass  #   name Mail pass  

     

16. Find where a string first appears

    " AITG " Print (Name.find ("t")) # look back from the beginning, find the first string, the output gets the position # Output 2
    #未找到输出结果-1

17. format the string.

    " I am {a}, age {b} " # Specifies the incoming Print " AITG ", B = +))# Dictionary method incoming print(Name.format_map ({"A  "'aitg'"b": 27}))

19. Whether the string contains letters and numbers

     name =  " AITG  "  Span style= "COLOR: #008000" >#   output True  print   (Name.isalnum ())  #   output False  print  ( " Span style= "COLOR: #800000" >ait g\t   ". Isalnum ()) 

     

21.  name = "  AITG   "  output True  print   ( Name.isalpha ())  print  ( "  yards farming is crazy   " .isalpha () Output False  print  ( " 1234  " . Isalpha ()) 

     

23. current input is a number

      #   support 10-digit judgment  print  ("  1234324   " .isdecimal ()) supports 10 binary and 10 decimal  print  ("  1234①⑨   " .isdigit ()) supports 10 digits, 10 decimal, Kanji digit  print  ( "  twos 1234①⑨  "  .isnumeric ())  #   output True  

     

25. Whether there are non-visible characters/t/n

    " aitg\t\n " Print (Name.isprintable ()) # output False does not appear true

27. Determine if all are spaces

    "   " Print (Name.isspace ()) # all are spaces return true no person False

29.  name = "  my name is AITG   "" Span style= "COLOR: #008000" >#   #   output False  print   (Name.istitle ())  #   Convert to title format  #   output My Name is AITG  print  (Name.title ()) 

     

31. Stitching each element in a string according to the specified delimiter

    " AITG " Print ("_". Join (name)) # Output A_i_t_g

32. determine if all are case and converted to uppercase and lowercase letters

    #determine if all lowercase letters arePrint('AITG'. Islower ())#determine if the letters are all uppercasePrint('AITG'. Isupper ())#Convert all letters to lowercasePrint('AITG'. Lower ())#convert all letters to uppercasePrint('AITG'. Upper ())

34. remove specified string

      #   You can specify the removal character, with a limited number of matches.  name =   AITG  "  #   default remove space to the left \ n  print   (Name.lstrip ())  #   The default removes the space on the right \ \ n  print   (Name.rstrip ())  #   default removes spaces on both sides \ \ n  print  (Name.strip ()) 

     

36. corresponding relationship substitution

    " AITG " Print (Name.replace ("g""g")) # Output AITG

37. Split String

    Name ="AITGAITG"#The default is divided into three parts#from left to rightPrint(Name.partition ("T"))#from right to leftPrint(Name.rpartition ("T"))#split the specified number from left to rightPrint(Name.split ("T", 1))

39. Case conversion (uppercase and lowercase conversions in letters)

    " AITGAITG " Print (Name.swapcase ()) # Output AITGAITG

(Common operation of str) Python learning content the next day