Conditional Expression - Ternary Operation

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∟Conditional Expression - Ternary Operation

This section provides a quick introduction on conditional expression, which tests a Boolean object and returns one of two given objects.

What Is Conditional Expression? A conditional expression is a special expression that tests a Boolean object and returns one of two given objects.

A conditional expression is also called a ternary operation, because it requires 3 operands:

operand_1 if operand_2 else operand_3

where:
  operand_2 is the condition object
  operand_1 is evaluated and returned, if operand_2 is True
  operand_3 is evaluated and returned, if operand_2 is False

Here are two examples of conditional expressions:

>>> 'Yes' if 1/3 > 0.3333333333333 else 'No'
'Yes'

>>> 'Yes' if 1/3 > 0.3333333333333333333 else 'No'
'No'

Ternary operations have a precedence lower that Boolean OR:

Symbols                Operations
--------------------   --------------
...
not                    Boolean NOT
and                    Boolean AND
or                     Boolean OR
if ... else            Ternary operation