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INDEX Numbers and Symbols __(double underscore), using in 256 objects and 257 objects, 154–155 dunder methods, 322. See also ./, using with Ubuntu, 42 underscore (_) /? command line argument, 25–26 / (forward slash) = assignment operator, 113 purpose of, 18 == comparison operator, 113, 336 using with command line chaining, 103, 105 arguments, 25 using to compare objects, 154 # (hash mark) using with None, 94–95 using with comments, 183 != comparison operator, 336 using with docstrings, 188 * and ** syntax [] (index operator), using, 117 using to create variadic functions, ; (semicolons), using with timeit 167–171 module, 226–227 using to create wrapper functions, ' (single quote), using, 46 171–172 ~ (tilde), using in macOS, 23 using with arguments and - (unary operator), 155–157 functions, 166–167 + (unary operator), 156–157 * character, using as wildcard, 28–29 _ (underscore) ? character, using as wildcard, 28–29 PEP 8’s naming conventions, [:] syntax, using, 104 60–61 < comparison operator, 337 as prefix for methods and <= comparison operator, 337 attributes, 291–292 > comparison operator, 337 private prefix, 81 >= comparison operator, 337 using with _spaces attribute, 290 -> (arrow), using with type hints, 191 using with dunder methods, 120 \ (backslash) using with private attributes and purpose of, 18 methods, 283 using with strings, 95 using with WizCoin class, 279 : (colon), using with lists, 97–98, 104 , (comma), including in single-item A tuples, 150 abcTraceback.py program, saving, 4 - (dash), using with command line __abs__() numeric dunder arguments, 25 method, 328 $ (dollar sign), using in macOS, 23 absolute versus relative paths, 20–21 . (dot), using with commands, 31 __add__() numeric dunder method, 327 -- (double dash), using with command addToTotal() function, creating, line arguments, 25 172–173 algebra for big O, 236 base class, relationship to algorithm analysis.
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