As pointed out, Python modulo makes a well-reasoned exception to the conventions of other languages. Modulus of negative numbers. 0, 100, -10. The answer can be found in the Python documentationfo… According to Wikipedia, in mathematical number theory, mathematicians prefer to stick to flooring towards negative infinity as in the following example: Python follows the same logic. I also thought it was a strange behavior of Python. Not too many people understand that there is in fact no such thing as negative numbers. As pointed out, Python modulo makes a well-reasoned exception to the conventions of other languages. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. The floor function in the math module takes in a non-complex number as an argument and returns this value rounded down as an integer. Adding scripts to Processing toolbox via PyQGIS. Python Negative Numbers in a List : Write a Python Program to Print Negative Numbers in a List using For Loop, While Loop, and Functions with an example. However, the behaviour of floor and truncbegins to diverge when we pass in negative numbers as arguments. 2 goes into 7 three times and there is 1 left over. It would be nice if a/b was the same magnitude and opposite sign of (-a)/b. -5%4. I forgot the geometric representation of integers numbers. #Calculate exponents in the Python programming language. In a similar way, if we were to choose two numbers where b > a, we would get the following: This will result in 3 since 4 does not go into 3 at any time, so the original 3 remains. If you’re using a negative operand, then you may see different results between math.fmod (x, y) and x % y. Here's a link to modulo's behavior with negative numbers. “The % symbol in Python is called the Modulo Operator. Calculate a number divisible by 5 and “greater” than -12. The modulo operator is considered an arithmetic operation, along with +, -, /, *, **, //. It returns the remainder of dividing the left hand operand by right-hand operand. It is chosen over the C behavior because a nonnegative result is often more useful. Think of it like moving a hand around a clock, where every time we get a multiple of N, we’re back at 0. So, let’s keep it short and sweet and get straight to it. In Python, // is floor division. Decoupling Capacitor Loop Length vs Loop Area. By recalling the geometry of integers given by the number line, one can get the correct values for the quotient and the remainder, and check that Python's behavior is fine. Essentially, it's so that a/b = q with remainder r preserves the relationships b*q + r = a and 0 <= r < b. (Although I assume that you have already resolved your concern a long time ago). The output is the remainder when a is divided by b. To what extent is the students' perspective on the lecturer credible? Modulus. According to Guido van Rossum, the creator of Python, this criterion has some interesting applications. Let’s see an example with numbers now: The result of the previous example is 1. Applying random luck scores to instances of people. Thanks your example made me understand it :). Maximum useful resolution for scanning 35mm film. Join Stack Overflow to learn, share knowledge, and build your career. Which one to keep is a difficult question, and there are arguments for both sides. Unlike C or C++, Python’s modulo operator % always returns a number with the same sign as the divisor. The official Python docs suggest using math.fmod () over the Python modulo operator when working with float values because of the way math.fmod () calculates the result of the modulo operation. Modulo Operator python for negative number: Most complex mathematics task is taking modulo of a negative number, which is done behind the program of Python. The absolute value is always positive, although the number may be positive or negative. Python Modulo. the remainder) is discarded. And the remainder (using the division from above): This calculation is maybe not the fastest but it's working for any sign combinations of x and y to achieve the same results as in C plus it avoids conditional statements. Simple Python modulo operator examples I've found some strange behaviour in Python regarding negative numbers: Unlike C or C++, Python's modulo operator (%) always return a number having the same sign as the denominator (divisor). In Python, you can calculate the quotient with // and the remainder with %.The built-in function divmod() is useful when you want both the quotient and the remainder.Built-in Functions - divmod() — Python 3.7.4 documentation divmod(a, b) returns … A weekly newsletter sent every Friday with the best articles we published that week. An example is to compute week days. 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