To summarize the contents of other (already good!) answers, isinstance caters for inheritance (an instance of a derived class is an instance of a base class, too), while checking for equality of …

Oct 23, 2015 · isinstance() takes a tuple of classes for the second argument. It'll return true if the first argument is an instance of any of the types in that sequence: isinstance(var, (classinfo1, …

Jun 26, 2012 · As expected, pep8 complains about this recommending usage of isinstance(). Now, the problem is that the numbers module was added in Python 2.6 and I need to write …

isinstance( 'x', basestring ) isinstance( u'u', basestring ) isinstance( 9, int ) isinstance( 2.5, float ) isinstance( (2+3j), complex ) None, BTW, never needs any of this kind of type checking. None …

Dec 14, 2018 · 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), …

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 …

May 30, 2017 · The answer to this question and to the other questions listed here all contain substantially the same information. But the answer to "How to check if a variable is a …

May 7, 2018 · isinstance() is your friend here. It returns a boolean and can be used in the following ways to check types. if isinstance(obj, (int, long, float, complex)): print obj, "is a built …

It's not that isinstance() is bad, often polymorphism can be used for the same purpose (which results in cleaner code in where the class is used). But sometimes, isinstance() is what you …

I would suggest x is None or isinstance(x, (str, bool, int)) - but I would also suggest you think more about what you're doing when you're doing that kind of type checking for types that don't have …