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If we have a Dictionary of type inherited from class dict, it will return False. Check if Variable is a Dictionary with isinstance()Īs we have seen that the is operator will return True when the memory address of both the objects is the same.
#Python dictionary of dictionaries code
If your code is required to work on subclasses of Dictionaries, then you would prefer to use the isinstance() method. Print( "memory address of dict:", id( dict)) # Different ID as they're different classes Print( type(squares) is dict) # False print( "memory address of type(squares):", id( type(squares))) For example, the previous code would not work if the squares variable was an Ordered Dictionary instead: from collections import OrderedDict One caveat of this method is that it fails to work if the variable is a type that's a subclass of dict. Note: The memory address may vary for you, but the same ID should be present for both the type(squares) and dict. Memory address of type(squares): 1609576584 This code will produce the following output on a Python interpreter: True Print( "memory address of dict:", id( dict)) # Should have same ID as type(squares) Print( type(squares) is dict) # True print( "memory address of type(squares):", id( type(squares))) Otherwise, it will output False.Īs a sanity check, we can use the id() function to get the address of the object in memory and verify the comparison: squares = It will output True only if the type() points to the same memory location as the dict class.
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We can use the is operator with the result of a type() call with a variable and the dict class. Being identical indicates that they refer to the same memory location. It verifies if both the operands are identical to each other. For a variable of type Dictionary, it must return :Ĭheck if Variable is a Dictionary with is Operator We can use the type() function to instantly get the type of any variable. Check if Variable is a Dictionary with type() Check if Variable is Dictionary with isinstance()ĭevelopers usually use type() and is, though, these can be limited in certain contexts, in which case, it's better to use the isinstance() function.Check if Variable is Dictionary with is Operator.Check if Variable is Dictionary with type().
#Python dictionary of dictionaries how to
In this tutorial, we'll take a look at how to check if a variable is a dictionary in Python, using the type() and isinstance() functions, as well as the is operator: If we had code that needed a dictionary but lacked type hints, how can we avoid errors if the variable used is not a dictionary? It's more common for a variable in Python to have no information of the type being stored. A developer can use type hints when creating variables or passing arguments, however, that's an optional feature in Python, and many codebases, old and new, are yet to have them. Variables act as a container to store data.