ValueError: invalid literal for int() with base 10: '10.1'

自定义输入时，提示ValueError: invalid literal for int() with base 10: '10.1'错误

>>> a = int(raw_input('please input something:'))
please input something:10.1

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 10: '10.1'

原因是数字字符串不能直接转int类型，需要转为float类型后才能转int类型：

>>> int(float("10.1"))
10

或者：

>>> a = float(raw_input('please input something:'))
please input something:10.1
>>> type(a)
<type 'float'>
>>> int(a)
10