solution.py

# For this exercise you will create a global flatten method.
# The method takes in any number of arguments and flattens them into a single array.
# If any of the arguments passed in are an array then the individual objects within the array will be flattened
# so that they exist at the same level as the other arguments.
# Any nested arrays, no matter how deep, should be flattened into the single array result.

# The following are examples of how this function would be used and what the expected results would be:

# flatten(1, [2, 3], 4, 5, [6, [7]]) # returns [1, 2, 3, 4, 5, 6, 7]
# flatten('a', ['b', 2], 3, None, [[4], ['c']]) # returns ['a', 'b', 2, 3, None, 4, 'c']


def flatten(*args):
    r = []

    def flat(arr):
        for x in arr:
            if isinstance(x, list):
                flat(x)
            else:
                r.append(x)

        return r

    return flat(args)