Normally, in Python, you want your code to support inheritance, of course (since inheritance is so handy, it would be bad to stop code using yours from using it!), so isinstance is less bad than checking …

Jan 28, 2013 · @exbluesbreaker What about isinstance(obj, object) or some other suitable class high up in our hierarchy? As others have ponted our, everything in Python is an instance of some class, …

Jun 26, 2012 · Now, the problem is that the numbers module was added in Python 2.6 and I need to write code that works with Python 2.5+ So if isinstance(var, Numbers.number) is not a solution.

I have a method that sometimes returns a NoneType value. So how can I question a variable that is a NoneType? I need to use if method, for example if not new: new = '#' I know that is the wron...

In python3, where every class is a type, isinstance() offers a lot of power. Without isinstance, if you're trying to parse a parameter that accepts a list or a dict, isinstance would appear to be the quickest …

May 30, 2017 · How would you check if a variable is a dictionary in Python? For example, I'd like it to loop through the values in the dictionary until it finds a dictionary. Then, loop through the one it finds: ...

isinstance handles inheritance (see What are the differences between type () and isinstance ()?). For example, it will tell you if a variable is a string (either str or unicode), because they derive from …

Jan 30, 2011 · The isinstance() built-in function is recommended for testing the type of an object, because it takes subclasses into account. So, if you're checking the type of a class object instead of …

Aug 17, 2010 · isinstance(<var>, (int, long)) Do not use type. It is almost never the right answer in Python, since it blocks all the flexibility of polymorphism. For instance, if you subclass int, your new …

In Python 3.8.4 it can be checked that the method with isinstance will fail when checking if a datetime is whether a date or a datetime as both checks will give True.