What is Truthy and Falsy? How is it different from True and False?

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

• None
• False
• Zeros, including:
  • 0
  • 0.0
  • 0j
  • decimal.Decimal(0)
  • fraction.Fraction(0, 1)
• Empty sequences and collections, including:
  • [] – 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

A “truthy” value will satisfy the check performed by if or while statements. We use “truthy” and “falsy” to differentiate from the bool values True and False.

Truth Value Testing