Description of the "Python" Str class method

#capitalize (): string first character uppercase

String = ' This is a string. '
New_str = String.capitalize ()
Print (NEW_STR)
#输出: This is a string.

#center (width, fillchar=none): Places the string in the middle, at the specified length, with the specified character padding
String = ' This is a string. '
New_str = String.center (30, ' * ')
Print (NEW_STR)
#输出: ******this is a string.*******

#count (Sub, Start=none, End=none): Calculates the number of characters in a string
String = ' This is a string. '
New_str = String.count (' i ')
Print (NEW_STR)
#输出: 3

#decode (Encoding=none, Errors=none): Decoding
String = ' This is a string. '
New_str = String.decode ()
Print (NEW_STR)

#encode (self, Encoding=none, Errors=none): encoded
String = ' This is a string. '
New_str = String.encode ()
Print (NEW_STR)

#endswith (self, suffix, start=none, end=none): Decide whether to end with a character
String = ' This is a string. '
New_str = String.endswith (' ing. ')
Print (NEW_STR)
#输出: True
New_str = String.endswith (' xx ')
Print (NEW_STR)
#输出: False

#expandtabs (self, Tabsize=none): Returns a tab character. Tabsize This option specifies the number of characters to be replaced with the tab "\ T", which defaults to 8
String_expandtabs = ' this\tis\ta\tstring. '
New_str = String_expandtabs.expandtabs ()
Print (NEW_STR)
#输出: This is a string.

#find (self, sub, Start=none, End=none): Find the position of the specified character in a string
String = ' This is a string. '
New_str = String.find (' a ') #找的到的情况
Print (NEW_STR)
#输出: 8
New_str = String.find (' xx ') #找不到的情况返回-1
Print (NEW_STR)
#输出:-1

#format (*args, **kwargs): Similar to the use of%s, it is implemented by {}
string1 = ' My name is {0},my job ' is {1}. '
NEW_STR1 = String1.format (' Yue ', ' tester ')
Print (NEW_STR1)
#输出: My name is yue,my job is tester.
string2 = ' My name is {name},my job ' is {job}. '
NEW_STR2 = String2.format (name= ' Yue ', job= ' tester ')
Print (NEW_STR2)
#输出: My name is yue,my job is tester.

#index (self, sub, Start=none, End=none): similar to find
String = ' This is a string. '
New_str = String.index (' a ') #找的到的情况
Print (NEW_STR)
#输出: 8
New_str = String.index (' xx ') #找不到的情况, program error
Print (NEW_STR)
#输出: Program run error, valueerror:substring not found

#isalnum (self): Determines whether the string is both a number and a letter, and returns true if yes, otherwise false
string = ' My name is yue,my. 18. '
New_str = String.isalnum ()
Print (NEW_STR)
#输出: False
string = ' Haha18121314lala '
New_str = String.isalnum ()
Print (NEW_STR)
#输出: True

#isalpha (self): Determines whether the string is all letters, or returns TRUE if it is false otherwise
string = ' ABCDEFG '
New_str = String.isalpha ()
Print (NEW_STR)
#输出: True
string = ' My name is Yue '
New_str = String.isalpha () #字母中间带空格, special characters are not
Print (NEW_STR)
#输出: False

# isdigit (self): Determines whether the string is a number, or true if it is, otherwise false
string = ' 1234567890 '
New_str = String.isdigit ()
Print (NEW_STR)
#输出: True
string = ' Haha123lala '
New_str = String.isdigit () #中间带空格, special characters are not
Print (NEW_STR)
#输出: False

# Islower (self): Determines whether the letters in the string are lowercase, returns true if yes, otherwise returns false
string = ' My name is yue,my. 18. '
New_str = String.islower ()
Print (NEW_STR)
#输出: True
string = ' My name is yue,my. 18. '
New_str = String.islower ()
Print (NEW_STR)
#输出: False

# isspace (self): Determines whether the string is a space, returns true if it is, or false
string = ' '
New_str = String.isspace ()
Print (NEW_STR)
#输出: True
string = ' My name is yue,my. 18. '
New_str = String.isspace ()
Print (NEW_STR)
#输出: False

# Istitle (self): detects if all the words in the string are spelled in uppercase, and the other letters are lowercase.
string = ' My Name is Yue. '
New_str = String.istitle ()
Print (NEW_STR)
#输出: True
string = ' My name is yue,my. 18. '
New_str = String.istitle ()
Print (NEW_STR)
#输出: False

# Isupper (self): detects whether all letters in the string are uppercase.
string = ' MY NAME is YUE. '
New_str = String.isupper ()
Print (NEW_STR)
#输出: True
string = ' My name is Yue. '
New_str = String.isupper ()
Print (NEW_STR)
#输出: False

# Join (Self, iterable): Generates a new string from the elements in the sequence with the specified character connection.
String = ("haha", "lala", "Ohoh")
str = "-"
Print (Str.join (string))
#输出: Haha-lala-ohoh

# Ljust (self, Width, fillchar=none): Returns an original string left aligned and fills a new string of the specified length with a space. Returns the original string if the specified length is less than the length of the original string.
string = "My name is Yue."
Print (String.ljust (18))
#输出: My name is Yue.

# lower (self): Converts all uppercase characters in a string to lowercase.
String = "My Name is YUE."
Print (String.Lower ())
# output: My name is Yue.

# Lstrip (self, chars=none): Truncates the left space of the string or specifies the character.
String = "My Name is YUE."
Print (String.lstrip ())
#输出: My Name is YUE.
String = "My Name is YUE."
Print (String.lstrip (' My '))
#输出: Name is YUE.

# partition (self, SEP): Splits the string according to the specified delimiter.
string = "Http://www.mingyuanyun.com"
Print (String.partition ('://'))
#输出: (' http ', '://', ' www.mingyuanyun.com ')

#replace (self, old, new, Count=none): replaces the older string in the string with the new one, and if you specify the third parameter max, the replacement does not exceed Max times.
string = "My name is Yue."
Print (String.Replace ("Yue", "Ying"))
#输出: My name is Ying.

# RFind (self, sub, Start=none, End=none): Returns the position of the last occurrence of the string, or 1 if there is no match.
string = "My name is Yue."
Print (String.rfind (' is '))
#输出: 8
string = "My name is Yue."
Print (String.rfind (' XXX '))
#输出:-1

# Rindex (self, sub, Start=none, End=none): Returns the substring of STR in the last occurrence of the string, and if there is no matching string to report the exception, you can specify an optional parameter [Beg:end] to set the search interval.
string = "My name is Yue."
Print (String.rindex (' is '))
#输出: 8
string = "My name is Yue."
Print (String.rindex (' XXX '))
#输出: Valueerror:substring not found

# Rjust (self, Width, fillchar=none): Returns the right alignment of an original string and fills the new string with a space of length width. Returns the original string if the specified length is less than the length of the string.
string = "My name is Yue."
Print (String.rjust (18))
#输出: My name is Yue.

# Rpartition (Self, SEP): Splits the string from right to the specified delimiter.
string = "Http://www.mingyuanyun.com"
Print (String.rpartition ('. '))
#输出: (' Http://www.mingyuanyun ', '. ', ' com ')

# Split (self, Sep=none, Maxsplit=none): Slices The string by specifying a delimiter.
string = "haha lala gege"
Print (String.Split ("))
#输出: [' haha ', ' lala ', ' Gege ']
Print (String.Split (', 1))
#输出: [' haha ', ' lala Gege ']

# Rsplit (self, Sep=none, Maxsplit=none): Slices the string from right by specifying a delimiter.
string = "haha lala gege"
Print (String.rsplit ("))
#输出: [' haha ', ' lala ', ' Gege ']
Print (String.rsplit (', 1))
#输出: [' haha lala ', ' Gege ']

# Rstrip (self, chars=none): Deletes the specified character at the end of the string (the default is a space).
string = "My name is Yue."
Print (String.rstrip ())
#输出: My name is Yue.

# strip (Self, chars=none): Removes the character specified by the tail of the string (the default is a space).
string = "My name is Yue."
Print (String.strip ())
#输出: My name is Yue.

# Splitlines (self, keepends=false): Separated by line (' \ r ', ' \ r \ n ', \ n '), returns a list containing the rows as elements, if the argument keepends is False, does not contain a newline character, if true, The line break is preserved.
str1 = ' ab C\n\nde fg\rkl\r\n '
Print (Str1.splitlines ())
# output: [' ab C ', ', ' de fg ', ' KL ']
str2 = ' ab C\n\nde fg\rkl\r\n '
Print (Str2.splitlines (True))
# output: [' ab c\n ', ' \ n ', ' de fg\r ', ' kl\r\n ']

# startswith (self, prefix, Start=none, End=none): Checks whether the string starts with the specified substring, returns True if yes, otherwise returns FALSE. If the parameter beg and end specify a value, the check is within the specified range.
string = "My name is Yue."
Print (String.startswith (' My '))
#输出: True
string = "My name is Yue."
Print (String.startswith (' Yue '))
#输出: False

# swapcase (self): Converts the uppercase and lowercase letters of a string.
String = "My Name is Yue."
Print (String.swapcase ())
#输出: MY NAME is YUE.

# title: Returns a "header" string, meaning that all words start with uppercase and the remaining letters are lowercase (see istitle ()).
string = "My name is Yue,my 18."
Print (String.title ())
#输出: My Name is yue,my 18.

# Translate (self, table, Deletechars=none): Converts the character of a string according to the table given by the parameter table (containing 256 characters), and the character to be filtered out into the del parameter.
From string import Maketrans
str = "AOEIU"
num = "12345"
Trantab = Maketrans (str, num)
string = "My name is Yue"
Print (String.translate (trantab))
# output: my n1m3 4s y53

# upper (self): Converts lowercase letters in a string to uppercase.
string = "My name is Yue,my 18."
Print (String.upper ())
#输出: MY NAME is yue,my 18.

# Zfill (self, width): Returns a string of the specified length, the original string is right-aligned, and the front padding is 0.
string = "My name is Yue."
Print (String.zfill (18))
#输出: 000my name is Yue.

Description of the "Python" Str class method