Python: Operators

By Xah Lee. Date: . Last updated: .

Arithmetic Operators

Addition operator is +

print(3 + 4) # 7

Substract operator is -

print(3 - 4) # -1
print(3 + - 4)   # -1

Multiplication operator is *

print(3 * 4) # 12

Power operator is **

print(2 ** 3) # 8

Divide operator is /

print(11 / 5) # 2.2

Quotient operator is //

print(11 // 5)    # 2

Remainder (modulo) operator is %

print(11 % 5) # 1

Quotient and remainder function divmod

print(divmod(11, 5))  # (2, 1)

Assignment Operators

Add and assign +=

x = 0
x += 1
print(x)    # 1

Substract and assign -=

x = 0
x -= 2
print(x)    # -2

Multiply and assign *=

x = 2
x *= 3
print(x)    # 6

Exponent and assign **=

x = 3
x **= 2
print(x)    # 9

Divide and assign /=

x = 7
x /= 2
print(x)    # 3.5

Modulus (remainder) and assign %=

x = 13
x %= 5
print(x)    # 3

Quotient and assign //=

x = 13
x //= 5
print(x)    # 2

Note: Python doesn't support C++ language's increment operator ++, nor the decrement operator --.

WARNING: ++i may not generate any error, but it doesn't do anything.

Bit Operators

0b101 mean binary number 101

the "{:2b}" means print in binary, and use 2 slots.

bitwise And &

print( "{:2b}".format(0b11 & 0b10) )   # binary 10

bitwise Or |

print( "{:2b}".format(0b11 | 0b10) )   # binary 11

xor ^. Means true if both sides differ

print( "{:2b}".format(0b00 ^ 0b10) )   # binary 10

binary invert ~

print( "{:2b}".format(~ 0b1) )   # binary -10  (odd result!)

Sequence (list etc) Operators

see Python: List Methods

Boolean Operators

see Python: True/False (boolean)

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