This script takes a nested array of integer numbers and returns a flat array

nested_to_flat_array.py

print("This program takes a nested array of integer numbers and returns a flat array")
print("Press Ctrl+C to exit")
try:
    while True:
        flat_array = []
        nested_array = input("Pleas input your arbitrary array:\n")

        def loop_through_list(given_list):  # this function checks if list items are a list themselves
            for a in given_list:              # and if so, it calls itself within that list item.
                if type(a) == list:
                    loop_through_list(a)
                else:
                    flat_array.append(a)    # otherwise, appends the integer list item into the flat array

        try:
            list(nested_array)
        except (NameError, TypeError, ValueError):      # trying to catch exception errors
            print("Please input Arrays only")
        except SyntaxError:
            print("Make sure your array is nested properly with correct syntax")
        else:
            for items in nested_array:
                if type(items) == str:
                    print("Make sure array contains numbers only")
                    break                   # the loop breaks if it finds a single non integer (string) item
                elif type(items) == int:
                    flat_array.append(items)
                elif type(items) == list:    # running loops inside loop to fetch the lists inside list
                    loop_through_list(items)
        if len(flat_array) > 0:             # now the flat array will be printed only if it's not empty
            print flat_array

except KeyboardInterrupt:
    print("You have exited")