\n| Sequence\/Collection<\/td>\n | ''<\/code> (empty string),
\n[]<\/code> (empty list),
\n()<\/code> (empty tuple),
\n{}<\/code> (empty dict),
\nset()<\/code> (empty set)<\/td>\n<\/tr>\n\n| Custom object<\/td>\n | Any object with __bool__()<\/code> or __len__()<\/code> returning False<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n# All of these evaluate as False<\/em>
\nif not “”:<\/em>
\nprint(“Empty string is falsy”)<\/em><\/p>\nif not 0:<\/em>
\nprint(“Zero is falsy”)<\/em><\/p>\nif not None:<\/em>
\nprint(“None is falsy”)<\/em><\/p>\nif not []:<\/em>
\nprint(“Empty list is falsy”)<\/em><\/p>\nTruthy Values in Python<\/strong><\/p>\nEverything else not listed as falsy is truthy.<\/p>\n Examples:<\/strong><\/p>\n“hello” # non-empty string<\/em>
\n42 # any non-zero number<\/em>
\n[1, 2, 3] # non-empty list<\/em>
\n{“a”: 1} # non-empty dictionary<\/em>
\nTrue # obviously!<\/em><\/p>\nThese will all make if statements run:<\/strong><\/p>\nif [1, 2, 3]:<\/em>
\nprint(“Truthy list!”)<\/em><\/p>\nif “Python”:<\/em>
\nprint(“Truthy string!”)<\/em><\/p>\nBoolean Context Examples:<\/strong><\/p>\nx = []<\/em><\/p>\nif x:<\/em>
\nprint(“List has items.”)<\/em>
\nelse:<\/em>
\nprint(“List is empty.”)<\/em><\/p>\nOutput:<\/strong> List is empty.<\/p>\nUsing bool() to Check Value Truthiness<\/strong><\/p>\nYou can test how Python evaluates any value using bool():<\/p>\n print(bool(0)) # False<\/em>
\nprint(bool(“Hi”)) # True<\/em>
\nprint(bool([])) # False<\/em>
\nprint(bool([0])) # True (non-empty list!)<\/em><\/p>\nSummary:<\/strong><\/p>\n\n\n\nValue Type<\/strong><\/th>\nTruthy Example<\/strong><\/th>\nFalsy Example<\/strong><\/th>\n<\/tr>\n<\/thead>\n\n\n| String<\/td>\n | \"Python\"<\/code><\/td>\n\"\"<\/code><\/td>\n<\/tr>\n\n| Number<\/td>\n | 42<\/code><\/td>\n0<\/code><\/td>\n<\/tr>\n\n| List<\/td>\n | [1, 2]<\/code><\/td>\n[]<\/code><\/td>\n<\/tr>\n\n| Dictionary<\/td>\n | {\"a\": 1}<\/code><\/td>\n{}<\/code><\/td>\n<\/tr>\n\n | | | | | | | | | | | | |