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 …

Jan 27, 2013 · 179 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 …

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.

Given that current doc of isinstance says nothing about this case I suppose this is valid Python code. However if you use mypy be aware of this currently-open issue.

May 30, 2017 · But the answer to "How to check if a variable is a dictionary in python" is "Use type () or isinstance ()" which then leads to a new question, which is what is the difference between …

Jan 30, 2011 · 1618 In Python 3.x, the correct way to check if s is a string is isinstance(s, str) The bytes class isn't considered a string type in Python 3. In Python 2.x, the correct check was …

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.

Aug 17, 2010 · Hmm. I wonder about the BUT part! isn't proper and clear data checking on method input (e.g. start, before beginning to do anyting with a variable) good practice in …

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 …

Nov 9, 2022 · 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 …