1.5. Operators

1.5.1. Comparison Operators

• x < y - Less than

• x <= y - Less or equal

• x > y - Greater than

• x >= y - Greater or equal

• x == y - Equals

• x != y - Not Equals

10 < 2              # False
10 <= 2             # False
10 > 2              # True
10 >= 2             # True
10 == 2             # False
10 != 2             # True

x = 10
y = 2

x >= 2
# True

1.5.2. Arithmetic Operators

• + - Addition

• - - Subtraction

• * - Multiplication

• / - Division

10 + 2              # 12
10 - 2              # 8
10 * 2              # 20
10 / 2              # 5.0

x = 10
y = 2

x + y
# 12

1.5.3. Power and Root

• ** - Power

Listing 1.11. n-th power of the number

10 ** 2             # 100
2 ** -1             # 0.5
1.337 ** 3          # 2.389979753

Listing 1.12. n-th root of the number

4 ** (1/2)          # 2.0
2 ** (1/2)          # 1.4142135623730951
27 ** (1/3)         # 3.0

4 ** 0.5            # 2.0
2 ** 0.5            # 1.4142135623730951
27 ** 0.333         # 2.9967059728946346

1.5.4. Divisions

• / - Division

• // - True division

• % - Modulo division (reminder)

12 / 6              # 2
12 / 5              # 2.4

12 // 6             # 2
12 // 5             # 2

12 % 6              # 0
12 % 5              # 2

Listing 1.13. Even vs odd

12 % 2 == 0         # True
11 % 2 == 0         # False

1.5.5. Increment Operators

• += - Incremental addition

• -= - Incremental subtraction

• *= - Incremental multiplication

• /= - Incremental division

x = 10
x = x + 1

print(x)
# 11

x = 10
x += 1

print(x)
# 11

x = 10
x -= 1

print(x)
# 9

>>> x++
  File "<stdin>", line 1
    x++
      ^
SyntaxError: invalid syntax

>>> ++x
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'x' is not defined
>>> x = 1
>>> ++x
1