Canonical Way to Check for Type in Python

Use isinstance() to check if an object is of a specific type or a subclass of it.
Example: Check if an object is of type str

mystr = "hello"
if isinstance(mystr, str):
   print("mystr is a string")

This will return true even if mystr is an instance of a subclass of str.
To check for an exact type (not allowing subclasses), use type():

if type(mystr) is str:
   print("mystr is exactly a string")

Use isinstance() in most cases, especially when you want to allow subclasses. It is more flexible and considered more Pythonic.

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