Truth Value Testing

In Python, Any object can be tested for truth value, for use in an if or while condition or as operand of the Boolean operations or, and, not.

Truthy and Falsy

1. A value is Truthy if it is evaluated to True when tested for truth value.
2. A value is Falsy if it is evaluated to False when tested for truth value.

All values are considered "truthy" except for the following, which are "falsy":

• None
• False
• 0
• 0.0
• 0j
• Decimal(0)
• Fraction(0, 1)
• [] - an empty list
• {} - an empty dict
• () - an empty tuple
• '' - an empty str
• b'' - an empty bytes
• set() - an empty set
• an empty range, like range(0)
• objects for which
  • obj.__bool__() returns False
  • obj.__len__() returns 0