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Python sets are very much like mathematical sets, and support operations like set intersection and union. Python also features a frozenset class for immutable sets, see Collection types. Dictionaries (class dict) are mutable mappings tying keys and corresponding values. Python has special syntax to create dictionaries ({key: value})
Python's is operator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a <= b <= c. Python uses and, or, and not as Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generator expression. [78]
Python uses sys.argv, e.g.: import sys for arg in sys . argv : print arg Python also has a module called argparse in the standard library for parsing command-line arguments.
The same identifier can be independently defined in multiple namespaces. That is, an identifier defined in one namespace may or may not have the same meaning as the same identifier defined in another namespace. Languages that support namespaces specify the rules that determine to which namespace an identifier (not its definition) belongs. [10]
Also on the above systems, some programs such as the command-line shell will search a path for a file. Inserting a leading (back)slash, as in "./name", will stop the searching of the path. This is a partially qualified name, but not a fully qualified name as it still depends on the current directory. A fully qualified name, because it contains ...
Pytest's markers can, in addition to altering test behaviour, also filter tests. Pytest's markers are Python decorators starting with the @pytest. mark.< markername > syntax placed on top of test functions. With different arbitrarily named markers, running pytest -m <markername> on the command line will only run those tests decorated with such ...
Etags generates a tag table file for Emacs, while the ctags command is used to create a similar table in a format understood by vi. They have different sets of command line options: etags does not recognize and ignores options which only make sense for vi style tag files produced by the ctags command. [6]
line 2: Imports the tkinter module into your program's namespace, but renames it as tk. line 5: The application class inherits from Tkinter's Frame class. line 7: Defines the function that sets up the Frame. line 8: Calls the constructor for the parent class, Frame. line 12: Defining the widgets.