scriptfile
Denotes the name of a Python script file to run as the main,
topmost file of a program (e.g., python main.py runs the code
in main.py). The script’s name may be an absolute or relative
(to “.”) filename path, and is made available in sys.argv[0].
On some platforms, command lines may also omit the
python component if they begin with a script file name and
have no options for Python itself.
-c command
Specifies Python code (as a string) to run (e.g., python -c
"print('spam' * 8)" runs a Python print operation).
sys.argv[0] is set to '-c'.
-m module
Runs a module as a script: searches for module on sys.path
and runs it as a top-level file (e.g., python -m pdb s.py runs
the Python debugger module pdb located in a standard li‐
brary directory, with argument s.py). module may also name
a package (e.g., idlelib.idle). sys.argv[0] is set to the
module’s full path name.
−
Reads Python commands from the standard input stream,
stdin (the default); enters interactive mode if stdin is a “tty”
(interactive device). sys.argv[0] is set to '−'.
arg*
Indicates that anything else on the command line is passed
to the script file or command, and appears in the built-in list
of strings sys.argv[1:].
If no scriptfile, command, or module is given, Python enters in‐
teractive mode, reading commands from stdin (and using GNU
readline for input, if installed), and setting sys.argv[0] to '' (the
empty string) unless invoked with option – in the preceding list.
Besides using traditional command lines at a system shell
prompt, you can also generally start Python programs by clicking
their filenames in a file explorer GUI; by calling functions in the
6 | Python Pocket Reference
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