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Engineering LibreTexts

18.1: Modulus Operator

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  • The modulus operator works on integers and yields the remainder when the first operand is divided by the second. In Python, the modulus operator is a percent sign (%). The syntax is the same as for other operators:

    >>> quotient = 7 / 3
    >>> print quotient
    >>> remainder = 7 % 3
    >>> print remainder

    So 7 divided by 3 is 2 with 1 left over.

    The modulus operator turns out to be surprisingly useful. For example, you can check whether one number is divisible by another — if x % y is zero, then x is divisible by y.

    Also, you can extract the right-most digit or digits from a number. For example, x % 10 yields the right-most digit of x (in base 10). Similarly x % 100 yields the last two digits.

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