Great Kata!

The function name should be in snake_case in Python.

Inside tests:

number = 21
while number > 0:
    # some code
    number -= myMove(number)

Inside myMove function:

def myMove(n):
    # some code
    if LOSE_CONDITION:
        return 'Computer won!'
    # some more code

These leads to TypeError: unsupportd operand type(s) for -=: 'int' and 'str' being raised if the user's algorithm is incorrect.

m = makeMove(number)
test.expect(m in range(1, 4), 'Your robot returned %s!' % m)
test.expect(m % 1 == 0, 'Your robot returned %s!' % m)

1. The second test is useless, and should be removed.
2. The error messages do not give any insight in why the returned value is wrong.

Okay, I take that back. Turns out the tests are even worse than I thought at first.

But, this changes nothing. You receive this error, because reference function returns "Computer won!", so your algorithm is still incorrect.

But its not, it returns int

Your code is wrong, and returns a string instead of a number.

number = 21
for TEST in range(0, 3):
    test.expect(makeMove(number) in range(1, 4), 'Did not return a number between 1 and 3')
    number -= makeMove(number)

This test makes no sense, as it means the same player taking 3 turns in a row.

Very disappointed with this kata, at first it was unclear what i suppose to do. Than, when i got it and passed all the tests, this annoying [TypeError: unsupportd operand type(s) for -=: 'int' and 'str'".] appeared out of nowhere, and i can't resolve it, but i have to, to get a course certificate in my school!

Damn it! I got it too, has anyone resolved this Error?

Oh, i got it! Damn thats clever!

Why res in square brackets?

How does this work? Never seen this before