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int()函数可以将字符串转换为整型，但是切记int()只能转化由纯数字组成的字符串，

非纯数字组成的字符串强转为整型会报错：ValueError: invalid literal for int() with base 10

如下例：

Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:59:51) [MSC v.1914 64 bit (AMD64)] on win32

Type "copyright", "credits" or "license()" for more information.

>>> str1='214567'

>>> str2=''

>>> str3='fsdf214356'

>>> int(str1)

214567

>>> int(str2)

Traceback (most recent call last):

File "<pyshell#4>", line 1, in <module>

int(str2)

ValueError: invalid literal for int() with base 10: ''#不可转换空字符串为整型

>>> int(str3)

Traceback (most recent call last):

File "<pyshell#5>", line 1, in <module>

int(str3)

ValueError: invalid literal for int() with base 10: 'fsdf214356'#不可转换非纯数字组成的字符串