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Operators for Numbers

  • +=
  • -=
  • ++
  • --
  • %
  • /
  • //
a = 2
b = 3
c = 2.3

d = a + b
print(d)       # 5
print(a + b)   # 5
print(a + c)   # 4.3
print(b / a)   # 1.5  # see the __future__
print(b // a)  # 1    # floor division
print(a * c)   # 4.6

print(a ** b)  # 8   (power)

print(17 % 3)  # 2   (modulus)

a += 7         # is the same as a = a + 7
print(a)       # 9

# a++          # SyntaxError: invalid syntax
# a--          # SyntaxError: invalid syntax

a += 1
print(a)       # 10
a -= 1
print(a)       # 9

There is no autoincrement (++) and autodecrement (--) in Python, because they can be expressed by += 1 and -= 1 respectively.