Example converted to pattern matching Here’s the equivalent code using match and case: match x: case int(): pass case str(): x = int(x) case float() | Decimal(): x = round(x) case _: raise TypeError(‘Unsupported type’) Explanation PEP 634 specifies that isinstance() checks are performed with class patterns. To check for an instance of str, write … Read more
An array is an object of type np.ndarray. Its values or elements are stored in a data buffer, which can be thought of as a contiguous block of memory bytes. The bytes in the data buffer do not have a type, because they are not Python objects. The array has a dtype parameter, which is … Read more
Just use not. isinstance just returns a bool, which you can not like any other.
You could try instanceofDocs… if ($var instanceof DateTime) { // true } See also is_aDocs: if (is_a($var, ‘DateTime’)) { // true }
Calling the function collections.namedtuple gives you a new type that’s a subclass of tuple (and no other classes) with a member named _fields that’s a tuple whose items are all strings. So you could check for each and every one of these things: def isnamedtupleinstance(x): t = type(x) b = t.__bases__ if len(b) != 1 … Read more
Due to PEP 585 – Type Hinting Generics In Standard Collections, Python’s standard library container types are also able to accept a generic argument for type annotations. This includes the collections.abc.Iterable class. When supporting only Python 3.9 or later, there is no longer any reason to use the typing.Iterable at all and importing any of … Read more
For historic reasons, bool is a subclass of int, so True is an instance of int. (Originally, Python had no bool type, and things that returned truth values returned 1 or 0. When they added bool, True and False had to be drop-in replacements for 1 and 0 as much as possible for backward compatibility, … Read more
If this is for Python 2.x or for Python 3.2+, you can use callable(). It used to be deprecated, but is now undeprecated, so you can use it again. You can read the discussion here: http://bugs.python.org/issue10518. You can do this with: callable(obj) If this is for Python 3.x but before 3.2, check if the object … Read more
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 … Read more