Maths operators

Python works like a calculator.

a = 17
b = 5
print(a + b)    # 22   add
print(a - b)    # 12   subtract
print(a * b)    # 85   multiply
print(a / b)    # 3.4  divide (always gives a float)
print(a // b)   # 3    floor division: divide and drop the decimal part
print(a % b)    # 2    remainder (modulo)
print(a ** 2)   # 289  power: 17 squared

% is used a lot. n % 2 == 0 means n is even. n % 10 gives the last digit of n.

Brackets work like in school maths: (2 + 3) * 4 is 20, while 2 + 3 * 4 is 14.