How to get a substring of a string

String is the most commonly used data type in Python. We can use quotes (' or ") to create strings.

Creating a string is as simple as assigning a value to a variable.

For example: var1 = 'Hello World!'

Code example:

str = ‘0123456789’
print str[0:3] #截取第一位到第三位的字符
print str[:] #截取字符串的全部字符
print str[6:] #截取第七个字符到结尾
print str[:-3] #截取从头开始到倒数第三个字符之前
print str[2] #截取第三个字符
print str[-1] #截取倒数第一个字符
print str[::-1] #创造一个与原字符串顺序相反的字符串
print str[-3:-1] #截取倒数第三位与倒数第一位之前的字符
print str[-3:] #截取倒数第三位到结尾
print str[:-5:-3] #逆序截取

Result:

012
0123456789
6789
0123456
2
9
9876543210
78
789
96

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