string of Python

String Common methods

S.find () S.join () S.split () S.replace () S.strip ()

S. isalnum()/s.isalpha()/s.isdigit( )

s.upper ()/ s.lower()

S.count ()

Len (s)

1. sequence type common operations

a) indexes and slices

Index: Example:s[0] left-to- right: Index starting from 0 ; right-to-left: Index starting from 1

slices: Example:s[0:2]

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Example :

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Example :

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Extended slices : Specify step size , Example: S[0:9:2]

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b)FormattingOutput: use python to output various types of string,integer,floating point number

Format:

Print "string %format1%format2... " % ( variable or value 1, variable or value 2 ...)

Symbols and their corresponding output formats:

%d Decimal integer

%f floating point number

%s String

%% for output symbol %

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c) forced type conversion

int(): Cast to integral type,

For example:

Note : Only will be by the number composition the string is converted to an integer type

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Float(): Cast to float type for example

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str (): Cast to a string such as :

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d) Example of string conversion: Formatting the output menu list, converting the user's input value to the integer type and verifying

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2. String Common methods

S.find (t): Find the substring T, find the first where it appears The index value is not found and returns -1

Example :

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S.split (Sep): Using Sep as the delimiter, the list returns the results.

Example:str= "www.baidu.com"

Str.split (".") get ["www", "Baidu", "com"] sequence

Example :

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S.join (ITER) uses S as a connector to concatenate all elements of the ITER For example:

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Example :

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S.replace (old,new): replace

Example :

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S. Strip (t): Delete the start and end characters T ( remove whitespace characters without the parameter t )

Example: Remove white space character S1.strip ()

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S.isalpha ()/s.isdigit (): /Whether it is a letter/whether it is a number

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The result is BOOL type

s.upper ()/ S.lower (): All letters converted to uppercase/lowercase letters,

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S.count (t) statistics on the number of occurrences of T

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Instance

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This article is from the "Duyuheng" blog, make sure to keep this source http://duyuheng.blog.51cto.com/12879147/1953120

string of Python