isinstance()类型检测

>>> isinstance(1,int)
True
>>> isinstance('a',str)
True

>>> type('a')
<type 'str'>
>>> type(1.024)
<type 'float'>

isinstance()还可以用来查看函数返回值类型：

>>> def func():
...     return 1
...
>>> type(func)
<type 'function'>
>>> type(func())
<type 'int'>