What are the python division operators?

Python division operator: 1. "/" operator, just get the result directly according to the conventional mathematical division calculation method; 2. "//" operator, take integer division and return the integer part of the quotient (Round down); 3. The "%" operator returns the remainder of division.

The operating environment of this tutorial: windows7 system, python3.7 version, DELL G3 computer

python division operator

1. "/" operator

Divide - x is divided by y, and the result can be obtained directly according to the conventional mathematical calculation method .

2. Integer division operator '//'

#1) If both the dividend and the divisor are If the number is positive or both are negative, just like programming languages ​​​​such as C, just take the quotient directly;

2) If one of the dividend or divisor is a positive number and the other is a negative number, the result needs to be Take the remaining . The focus here is on the downward modulus. Beginners will definitely confuse it with other programming languages. To give a simple example, in the C language, the result of -5 dividing 2 is -2, but in the python program, the result of the operation needs to be closer to negative infinity, that is, the remainder is taken downwards, and the result of -5//2 is - 3.

Let’s give a few examples to make it clear to everyone.

3. Remainder operator '%'

This is also different from the remainder operator in C language program open.

Example mathematical formula: a÷b=c....d (a is the dividend, b is the divisor, c is the quotient, d is the remainder)

1) in python , if a and b are both positive numbers or both negative numbers, the result is obtained according to normal operations.

2) In python, if one of a and b is a positive number and one is a negative number, the remainder is calculated according to d=a-b*[a//b], .

For example: 5%-2 The running result is -1. According to the formula, the result of 5//-2 is -3, and the final remainder result is -1. When we usually calculate mathematical operations, the quotient of 5%-2 is -2, and the remainder is 1. However, in python, when it comes to the // operation, the remainder needs to be taken downwards, so in python the quotient should be -3, and the result will be remainder -1. .

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