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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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
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