723 I have a function in python that can either return a bool or a list. Is there a way to specify the types using type hints? For example, is this the correct way to do it?

Jun 15, 2016 · How can I specify the type hint of a variable as a function type? There is no typing.Function, and I could not find anything in the relevant PEP, PEP 483.

If you look at the types module, types.FunctionType is actually defined simply by defining a trivial function and using type to return its type. The second one is easily broken by using a …

202 While I am aware of the duck-typing concept of Python, I sometimes struggle with the type of arguments of functions, or the type of the return value of the function. Now, if I wrote the …

This question seems mind-boggling simple, yet I can't figure it out. I know you can check datatypes in python, but how can you set a conditional based on the datatype? For instance, if …

Currently, in Python, a function's parameters and return types can be type hinted as follows:

54 First, avoid all type comparisons. They're very, very rarely necessary. Sometimes, they help to check parameter types in a function -- even that's rare. Wrong type data will raise an …

Python is a strongly-typed dynamic language, which associates types with values, not names. If you want to force callers to provide data of specific types the only way you can do so is by …

I'm looking for an efficient way to check variables of a Python function. For example, I'd like to check arguments type and value. Is there a module for this? Or should I use something like …

If you're using typing (introduced in Python 3.5) you can use typing.Optional, where Optional[X] is equivalent to Union[X, None]. It is used to signal that the explicit value of None is allowed .