def circular_shift(x, shift):
    """Circular shift the digits of the integer x, shift the digits right by shift
    and return the result as a string.
    If shift > number of digits, return digits reversed.
    >>> circular_shift(12, 1)
    "21"
    >>> circular_shift(12, 2)
    "12"
    """

    s = str(x)
    if shift > len(s):
        return s[::-1]
    else:
        return s[len(s) - shift:] + s[:len(s) - shift]

def check(candidate):

    # Check some simple cases
    assert candidate(100, 2) == "001"
    assert candidate(12, 2) == "12"
    assert candidate(97, 8) == "79"
    assert candidate(12, 1) == "21", "This prints if this assert fails 1 (good for debugging!)"

    # Check some edge cases that are easy to work out by hand.
    assert candidate(11, 101) == "11", "This prints if this assert fails 2 (also good for debugging!)"

if __name__ == '__main__':
    check(circular_shift)
