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Python: isinstance() function

isinstance() function

The isinstance() function returns true if the object argument is an instance of the classinfo argument, or of a subclass thereof.
If object is not an object of the given type, the function always returns false. If classinfo is a tuple of type objects return true if object is an instance of any of the types.
If classinfo is not a type or tuple of types and such tuples, a TypeError exception is raised.

Version:

(Python 3.2.5)

Syntax:

isinstance(object, classinfo)

Parameter:

Name Description Required /
Optional
object An object. Required
classinfo

A type or a class, or a tuple of types and/or classes.

Optional

Example: Python isinstance() function

num = [2, 4, 6]

x = isinstance(num, list)
print(num,'Instance of list?', x)

x = isinstance(num, dict)
print(num,'Instance of dict?', x)

x = isinstance(num, (dict, list))
print(num,'Instance of dict or list?', x)

number = 7

x = isinstance(num, list)
print(num,'Instance of list?', x)

x = isinstance(num, int)
print(num,'Instance of int?', x)

Output:

[2, 4, 6] instance of list? True
[2, 4, 6] instance of dict? False
[2, 4, 6] instance of dict or list? True
[2, 4, 6] instance of list? True
[2, 4, 6] instance of int? False

Python Code Editor:

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Python: Tips of the Day

How do I check if a list is empty?

For example, if passed the following:

a = []
if not a:
  print("List is empty")

Ref: https://bit.ly/2A4JXx9