Python3 string function example, python3 string example

Python3 string function example, python3 string example

_ Add _ function (append a string to the end)

S1 = 'hello' s2 = s1. _ add _ ('Boy! ') Print (s2) # output: Hello boy!

_ Contains _ (determines whether a string is contained, and returns True if it contains)

S1 = 'hello' result = s1. _ contains _ ('hes') print (result) # output: True

_ Eq _ (returns True if two strings are the same)

S1 = 'hello' s2 = 'who' result = s1. _ eq _ (s2) print (result) # output: False

_ Format __

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_ Getattribute __

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_ Getitem __

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_ Getnewargs __

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_ Ge _ (greater than or equal)

Print ('B'. _ ge _ ('A') # output: True

_ Gt _ (greater)

Print ('B'. _ ge _ ('A') # output: True

_ Hash __

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_ Iter __

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_ Len _ (returns the string length)

Print ('abc'. _ len _ () # output: 3

_ Le _ (less than or equal)

Print ('B'. _ le _ ('A') # output: False

_ Lt _ (less)

Print ('B'. _ lt _ ('A') # output: False

_ Mod __

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_ Mul __

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_ New __

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_ Ne __

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_ Repr __

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_ Rmod __

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_ Rmul __

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_ Sizeof __

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_ Str _ (return user)

Print ('abc'. _ str _ () # output: abc

Capitalize (uppercase)

S = 'Tom 'print (s. capitalize () # output: tom

Casefold (convert uppercase to lowercase)

S = 'Tom 'print (s. casefold () # output: TOM

Center (the first parameter specifies the length, and the second parameter specifies the characters to be filled. If it is left blank, It is a space)

S = 'Tom 'print (s. center (20,'-') # output: -------- Tom ---------

Count (calculate the number of occurrences of a string. The second parameter is the start position and the third parameter is the end position)

S = 'aabbbcccdd' print (s. count ('cc', 3,11) # output: 2

Encode)

S = "Chinese" print (s. encode ('gbk') # output: B '\ xd6 \ xd0 \ xce \ xc4'

Endswith (judge whether the string ends with a certain character or string, the second parameter: Start position, and the third parameter: end position)

S = 'project' print (s. endswith ('ts') print (s. endswith ('E',) # output: True # True

Expandtabs (convert one tab key to seven spaces)

S = 'H \ ti' print (s. expandtabs () # output: H I

Find (search for the index location of a character or string, the second parameter: Start position, the third parameter: end position)

S = 'hello' print (s. find ('O') print (s. find ('O',) # returns-1 if not found # outputs: 4 #-1

Format (string formatting/splicing)

Name = 'Tom 'age = 18 s =' {0} \'s age is {1 }'. format (name, age) print (s) # Or str = '{name} \'s age is {age}' result = str. format (age = 18, name = 'Tom ') print (result) # output: Tom's age is 18

Format_map

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Index (query the index location of a character or string, which is different from find. If the character does not exist, an error is returned)

S = 'hello' print (s. index ('O') print (s. index ('E',) # output: 4 #1

Isalnum (determines whether the string is a letter or number)

S = '! # 'Print (s. isalnum () # output: False

Isalpha (determines whether the string is a letter)

S = '000000' print (s. isalpha () # output: False

Isdecimal (judge whether the string is in decimal format)

S = '000000' print (s. isdecimal () # output: True # True: Unicode number, full-angle number (dual-byte) # False: Roman numerals, Chinese characters # Error: byte number (single-byte)

Isdigit (judge whether the string is a number)

S = '000000' print (s. isdigit () # output: True # True: Unicode number, byte number (single-byte), full-byte number (double-byte), and Rome number # False: Chinese Character number

Isidentifier (judge whether the string is an identifier/variable name)

S = '1num' print (s. isidentifier () # output: False # because the variable name cannot start with a number

Islower (determines whether all strings are in lower case)

S = 'hello' print (s. islower () # output: False

Isnumeric (judge whether the string is a number)

S = '000000' print (s. isnumeric () # output: True # True: Unicode number, full-angle number (dubyte), roman number, Chinese Character number

Isprintable (whether it is printable characters/whether it can be output as is)

S = '\ n' print (s. isprintable () # output: False

Isspace (whether it is a space)

Print (''. isspace () print ('\ t'. isspace () # output: True # True

Istitle (whether it is the title/uppercase of the first letter of each word)

Print ('Hello Boy '. istitle () print ('Hello boy'. istitle () # output: True # False