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 …

Nov 9, 2022 · isinstance(var, (classinfo1, classinfo2, classinfo3)) In other words, isinstance() already offers this functionality, out of the box. From the isinstance() documentation: If classinfo is neither a …

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.

isinstance(x, (types.FunctionType, types.BuiltinFunctionType, types.MethodType, types.BuiltinMethodType, types.UnboundMethodType)) I compared this with the code of is*() checks …

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, …

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 …

Hence, isinstance acquires a "new" meaning - it just checks for "declared" type compatibility, which is a good way to go in Python. On the other hand, if your object does not satisfy the interface you need, …

Additional information You can also check for multiple types in one isinstance() statement as mentioned in the documentation. Just write the types as a tuple.

My guess would be that its Python's internal subclassing, as zero and one - whether float or int - both evaluate when used as boolean, but don't know the exact reason.

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 …