python string related operations

1. '\ N' newline

2. '\ T' is a tab

3. The string concatenation, directly by "+" to complete the

repeated string 4, "*" is implemented

5. string extracting sections

6. string commonly used functions
len () function to get the length of the string

split () function, split the string, by default, to divide the space

strip () remove extra spaces before and after the string


upper () function, the string of capitalized letters
lower () function, the lowercase letter string
title () function, each of the string capitalized word
capitalize () function, the first letter string


replace ( 'a', 'b ') function, the string is replaced with a B

cOUNT () function, count