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This article mainly introduces what are the common commands of str in Python, which can be used for reference by interested friends. I hope you can learn a lot after reading this article.

Str string

For example:

Name = "adam"

Name1 = "Chow Tai Fook"

Conditional parameter configuration format of command statement

Center (self,width,fillchar= None)

Self: can be ignored directly

Width: must have parameters

Fillchar= None: you don't have to set parameters separately

Anyone who has a parameter = None can be understood as not having to set this parameter separately.

There are some common commands in str: 1. Capitalize

Initials are capitalized

Name = "adam" v = name.capitalize () # name string initials print (type (v), v) 2, casefold and lower

All lowercase

String in name = "aDam" v = name.casefold () # name becomes lowercase (it can handle case of letters in different languages) print (type (v), v) name = "aDam" v2 = name.lower () # string in lowercase (it can only handle English) print (type (v2), v2) 3, center

Set the length of the string and fill in the blank space in the content play and how to set the filled symbol to fill in the space by default

Name = "adam" v = name.center (25, "+") # add a plus sign before and after the string assigned by name, so that the whole string accounts for a total of 8 characters in the assigned string series of name, and assign values to vprint (type (v), v) 4, count

Look for the number of times a subsequence or character appears in a string, and you can set the starting number of search bits

Name = "adam" v = name.count ('axiomazine 2p4) # calculates how many times an appears in the string assigned by name. If it is not written, the default is to find the punch in place. If it is written, it looks for print (v) 5, endswith and startswith from the ground 2 to 4 bits.

Endswith can set the starting position to determine what the ending character is.

Startswith determines what the starting character is. You can set the starting position. Note that the starting position should be moved forward one unit.

Name = "adam" v = name.endswith ('daddy print 1) # determine whether the letter of the string assigned by name from the first character to the end of the second character is dv1 = name.startswith (' axiaojie 0) 2) # judge the string assigned by name, from bit 0 to bit 2 whether it begins with the letter a print (v) print (v1) 6, expandtabs

Fill in the previous character bits to the x bit with spaces. If the number of character digits before\ t is equal to x, replace it with x spaces directly.\ t if the number of character digits before\ t is greater than x, fill in the remaining spaces at the end of the preceding character (the output no longer displays\ t).

Test = '12345\ t6789\ v = test.expandtabs (8) v1 = test.expandtabs (3) v2 = test.expandtabs (5) print (v) print (v1) print (v2) # Application example: test =' name\ t gender\ t height\ n Zhang San\ t male\ t 180\ n Zhang San\ t male\ t 180\ t male\ t 180 test.expandtabs (10) print (v) 7, find

Find the first subsequence from the beginning to get the number of characters in front of it. You can also specify the search scope and the number of starting digits of the logical relation bits in the search range.

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