I have a method in Python and I only want to accept integers listed or singular, how can I define this?
def autoInt(integers):
assert int(integers)
assert len(integers) > 0
This fails as I cannot have a list. I'm sure it's something easy.
TypeError: int() argument must be a string or a number, not 'list'
Edit: I have been tasked so that this method can ONLY accept integers in a list.
That depends on what passes as an integer by your definition. For example, do instances of bool count? Does the float 1.0?
Anyway - you can combine the all builtin with a generator expression.
>>> a = [1,2,True]
>>> all(isinstance(x, int) for x in a)
True
As a sidenote: rigorously checking the argument types in not something Python programmers do when there's no specific reason. A better approach is usually to write clear docstrings and/or type hints.
Here is an answer which explains how to do the latter. Apart from that, there's usually a "garbage in -> garbage (or error)" out mentality.
You can test a list of integers like this:
assert(all(isinstance(item, int) for item in integers))
>>> my_list = [1, 2, 3.25]
>>> all(isinstance(item, int) for item in my_list)
False
>>> other_list = range(3)
>>> all(isinstance(item, int) for item in other_list)
True
>>>