Python String functions

1, First letter capital

' GHOSTWU '>>> s.capitalize ()'ghostwu'

2,replace, replacing

>>> s ='My name is GHOSTWU'>>>s'My name is GHOSTWU'>>> S.replace (' -',' -' )'My name is GHOSTWU'>>>s'My name is GHOSTWU'>>>

Check Help

>>> Help (Str.replace)

If it is a process-oriented function usage, direct help (the function name), such as Help (ABS)

Usage notes:

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

Return a copy of string S with all occurrences of substring
Old replaced by new. If The optional argument count is
Given, only the first count occurrences is replaced.

Accept 3 parameters, the first character to be replaced, the second with what character to replace, the number of times the third substitution, if not passed, default all replace

1>>> str ='121212'2>>> Str.replace ('1','g' )3 'g2g2g2'4>>> Str.replace ('1','g', 1 )5 'g21212'6>>> Str.replace ('1','g', 2 )7 'g2g212'8>>> Str.replace ('1','g', 3 )9 'g2g2g2'

3,split: Cutting

1>>> ip='127.0.0.1'2>>>IP3 '127.0.0.1'4>>> Ip.split ('.' )5['127','0','0','1']6>>> Ip.split ('.', 1 )7['127','0.0.1']8>>> Ip.split ('.', 2 )9['127','0','0.1']Ten>>> Ip.split ('.', 3 ) One['127','0','0','1'] A>>>

4, using the string module, use the following:

1 Import string 2 >>> Help (string.capitalize)34'ghostwu' 5 >>> string.capitalize (s)6'ghostwu'

1>>>Importstring2>>> s ='My name is GHOSTWU'3>>> String.Replace (s),' -',' -' )4 'My name is GHOSTWU'5>>>IP6 '127.0.0.1'7>>> string.split (IP,'.' )8['127','0','0','1']9>>> string.split (IP,'.', 1 )Ten['127','0.0.1'] One>>>

5,filter: Filter, use this function to filter out an even number of a sequence

1>>>defIsEven (n):2...ifn% 2 = =0:3...returnTrue4 ... 5>>> IsEven (10 )6 True7>>> IsEven (3 )8>>> Range (10 )9[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]Ten>>> L = Range (10 ) One>>>Filter (IsEven, L) A[0, 2, 4, 6, 8] ->>>

Python String functions