all Python 3Conditionalsconstruct

Comparison operators

operators

The operators ==, !=, >, <, >= and <= compare two values and return a bool. Python also supports chained comparisons: a < b < c.

Syntax

a == b | a != b | a > b | a < b | a >= b | a <= b

The main pitfall is comparing floats with ==: because of binary rounding, 0.1 + 0.2 is not equal to 0.3, so reach for math.isclose with floats. In a chain like a < b < c the middle operand is evaluated only once, and the check stops at the first false link.

Examples

print(5 == 5)  # → True
print(5 != 3)  # → True
print(7 > 3)  # → True
print(2 < 1)  # → False
print(5 >= 5)  # → True
print("abc" < "abd")  # → True (лексикографически)
x = 5
print(1 < x < 10)  # → True (цепочка сравнений)
print(1 < x < 4)  # → False

See also

Common errors

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