python如何判断数据类型
python中如何判断⼀个变量的数据类型？(原创) 收藏
import types
type(x) is types.IntType # 判断是否int 类型
parameter数据类型type(x) is types.StringType #是否string类型
超级恶⼼的模式，不⽤记住types.StringType
import types
type(x) == types(1) # 判断是否int 类型
type(x) == type('a') #是否string类型
使⽤内嵌函数：
isinstance( object, classinfo )
Return true if the object argument is an instance of the classinfo argument, or of a (direct or indirect) subclass thereof. Also return true if classinfo is a type object and object is an object of that type. If object is not a class instance or an object of the given type, the function always returns false. If classinfo is neither a class object nor a type object, it may be a tuple of class or type objects, or may recursively contain other such tuples (other sequence types are not accepted). If classinfo is not a class, type, or tuple of classes, types, and such tuples, a TypeError exception is raised. Changed in version 2.2: Support for a tuple of type information was added.
Python可以得到⼀个对象的类型 ，利⽤type函数：
>>>lst = [1, 2, 3]
>>>type(lst)
<type 'list'>
不仅如此，还可以利⽤isinstance函数，来判断⼀个对象是否是⼀个已知的类型。
isinstance说明如下:
isinstance(object, class-or-type-or-tuple) -> bool
Return whether an object is an instance of a class or of a subclass thereof.
With a type as second argument, return whether that is the object's type.
The form using a tuple, isinstance(x, (A, B, ...)), is a shortcut for
isinstance(x, A) or isinstance(x, B) or ... (etc.).
其第⼀个参数为对象，第⼆个为类型名或类型名的⼀个列表。其返回值为布尔型。若对象的类型与参数⼆的类型相同则返回True。若参数⼆为⼀个元组，则若对象类型与元组中类型名之⼀相同即返回True。
>>>isinstance(lst, list)
Trueisinstance(lst, (int, str, list))
True
>>>isinstance(lst, (int, str, list))
True
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