python – What does x % 2 ==0 mean?

python – What does x % 2 ==0 mean?

x % 2 gives the remainder after the integer division (when dealing with only integers such as in this case, otherwise a common type) of x/2. The % is called the modulo operator. Of course when the remainder is 0, the number is even.

Docs:

The % (modulo) operator yields the remainder from the division of the first argument by the second. The numeric arguments are first converted to a common type. A zero right argument raises the ZeroDivisionError exception. The arguments may be floating point numbers, e.g., 3.14%0.7 equals 0.34 (since 3.14 equals 4*0.7 + 0.34.) The modulo operator always yields a result with the same sign as its second operand (or zero); the absolute value of the result is strictly smaller than the absolute value of the second operand [2].

if x % 2 == 0 checks if a number is even.

x % 2 is 1 when the number is odd, and 0 when it is even.

python – What does x % 2 ==0 mean?

== 0 means equal to 0 (zero). So if foo == 0: means do the following if foo is equal to 0, thus if x % 2 == 0: means do the following if x % 2 is equal to 0.