Python STR Internal Function-Personal class notes, after-school summary

View the internal STR functionality, which can be viewed in the same way as int, or by using Type (str), dir (str).

1. Capitalize: Capitalize first letter

S.capitalize (), string

" Parr "  = str1.capitalize ()print(result)# returns Parr

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2. Center (self, Width, fillchar=none): Content centered, Width: total length; Fillchar: padding content in white space (default none)

S.center (width[, Fillchar]), string

" Parr "  = Str1.center ("*")print(result)# back to ***parr***

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3, COUNT (self, sub, Start=none, End=none): Number of substrings of STR, case-sensitive

S.count (sub[, start[, end]), int

" parrabcadb "  = Str1.count ("a")print(result)#  Returns 2, indicating that two A is found

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4, decode (self, Encoding=none, Errors=none): Decoding

S.decode ([encoding[,errors]]), object

" haha "  == result.decode ()Print (str2) screen printing: haha

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5, Encode (self, Encoding=none, Errors=none): coded

S.encode ([encoding[,errors]]), object

" haha "  = str1.encode ()print(result)# returns B ' \xe5\x93\x88\xe5\ X93\x88 '

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6, endswith (self, suffix, start=none, end=none): No end with XX, return value of bool type

S.endswith (suffix[, start[, end]), BOOL

" Parr Luck "  = Str1.endswith ("")print(result)#  screen printing ture

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7, Expandtabs (Self, tabsize=none): The tab is converted to a space, the default is a tab eight spaces

S.expandtabs ([Tabsize]), string

" Parr\thello "  = str1.expandtabs ()Print (Result) screen printing: Parr    Hello

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8, find (self, sub, Start=none, End=none): Find the sub-sequence position, if not found return-1

S.find (Sub [, Start [, end]]) int

" Parr "  = str1.find ('a')print(result)#  Screen printing 1, indicating a at 1 position

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9, Isalnum (self): whether it is a letter or a number, returns the value of type bool

S.isalnum (), BOOL

" parr2017 "  = str1.isalnum ()print(result)# screen printing: Ture

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10, Isalpha (self):: Whether it is a letter

S.isalpha (), BOOL

" Parr "  = str1.isalpha ()print(result)# screen printing: Ture

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11, IsNumeric (self): Whether it is a number

S.isnumeric (), BOOL

"  . "  = str1.isnumeric ()print(result)# screen printing ture

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12. Islower (self): lowercase

Isupper (self):: Whether it is uppercase

S.islower (), BOOL

" Parr "  = str1.islower ()print(result)# returns ture" Parr "  = str1.isupper ()print(result)# returns false

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13. Replace (self, old, new, Count=none): Replace content

S.replace (old, new[, Count]), string

" Parr "  = str1.replace ('a','hello')Print  (Result)# screen printing: Phellorr

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14, Split (self, Sep=none, Maxsplit=none): Split content, maxsplit up to a few times, return a list

S.split ([Sep [, Maxsplit]]), List of strings

" Parr "  = str1.split ('a')print(result)#  return [' P ', ' RR ']

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15. Splitlines (Self, Keepends=false):: Returns a list based on line break

S.splitlines (keepends=false), List of strings

""" Parr        Hello        everyone"" "= str1.splitlines ()print(result)  # return [' Parr ', '        hello ', '        everyone ']

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16, StartsWith (self, prefix, Start=none, End=none): whether to start with content in prefix

S.startswith (prefix[, start[, end]), BOOL

""" Parr        Hello        everyone"" "= Str1.startswith ('Parr' ) )print(result)# returns ture

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17, Strip (Self, Chars=none): Remove both ends of the blank

S.strip ([chars]), string or Unicode

"             parr2017              "= str1.strip ()print(result)# back to parr2017

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18, __contains__ (self, y): Check if y is included in X

X.__contains__ (y) <==> y in X

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Python STR Internal Function-Personal class notes, after-school summary