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

by

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

  • None
  • False
  • Zeros, including:
  • 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

More Related Contents:

  1. Why does “a == x or y or z” always evaluate to True?
  2. ‘and’ (boolean) vs ‘&’ (bitwise) – Why difference in behavior with lists vs numpy arrays?
  3. Merge lists that share common elements
  4. Priority of the logical operators NOT, AND, OR in Python
  5. Python `if x is not None` or `if not x is None`? [closed]
  6. Python boolean expression and or
  7. “Boolean” operations in Python (ie: the and/or operators)
  8. Why does “a == x or y or z” always evaluate to True? How can I compare “a” to all of those?
  9. Priority of the logical operators (order of operations) for NOT, AND, OR in Python
  10. NumPy chained comparison with two predicates
  11. In python how can we append run time reults to a list?
  12. Most efficient way to build single-element list from string with or without spaces? [closed]
  13. How to use global variables in Python?
  14. Conditional Replace Pandas
  15. Variable scopes in Python classes
  16. Append existing excel sheet with new dataframe using python pandas
  17. Find the column name which has the maximum value for each row
  18. Cron and virtualenv
  19. FutureWarning: elementwise comparison failed; returning scalar, but in the future will perform elementwise comparison
  20. Error while importing Tensorflow in Python 2.7 in Ubuntu 12.04. ‘GLIBC_2.17 not found’
  21. Pandas make new column from string slice of another column
  22. How to redirect stdout and stderr to logger in Python
  23. Converting list of tuples into a dictionary
  24. List dependencies in Python
  25. NameError from Python input() function [duplicate]
  26. Tkinter: invoke event in main loop
  27. Elegant way to remove fields from nested dictionaries
  28. Pandas style function to highlight specific columns
  29. Updating Python on Mac
  30. reading multiple files contained in a zip file with pandas

Leave a Comment