pythontypesisinstance

Python check if variable isinstance of any type in list

How do I compactly perform the following:

var = 7.0
var_is_good = (
    isinstance(var, classinfo1) or
    isinstance(var, classinfo2) or
    isinstance(var, classinfo3)
)
Solution

  • 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, classinfo2, classinfo3))

    In other words, isinstance() already offers this functionality, out of the box.

    From the isinstance() documentation:

    If classinfo is neither a class object nor a type object, it may be a tuple of class or type objects, or may recursively contain other such tuples (other sequence types are not accepted).

    Emphasis mine; note the recursive nature; (classinfo1, (classinfo2, classinfo3)) is also a valid option.