Introduction to Python isinstance functions _python

Isinstance (object, ClassInfo)

To determine whether an instance is this class or object

object is a variable
ClassInfo is a type (tuple,dict,int,float)
To determine whether a variable is this type

Copy Code code as follows:

Class Obja:
Pass

A = Obja ()
B = ' A ', ' V '
C = ' A string '

Print isinstance (A, Obja)
Print isinstance (B, tuple)
Print isinstance (C, basestring)

Output results:

Copy Code code as follows:

True
True
True

not only that, you can also use the Isinstance function to determine whether an object is a known type.
The isinstance description is as follows:

Copy Code code as follows:

Isinstance (object, class-or-type-or-tuple)-> bool

Return whether a instance a class or of a subclass thereof.
With a type as second argument, return whether this 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.).

The first argument is an object, and the second is a list of type names or type names. Its return value is Boolean. Returns true if the type of the object is the same as the type of parameter two. If the argument two is a tuple, returns true if the object type is the same as one of the type names in the tuple.

Copy Code code as follows:

>>>isinstance (LST, list)
True

>>>isinstance (LST, (int, str, list))
True

In addition: Python can get the type of an object, using the type function: >>>lst = [1, 2, 3]>>>type (LST) <type ' list ' >