Python Command Options
The option items in Python command lines are used by Python itself, and can be any of the following in Python 3.X (see Python 2.X Command Options ahead for 2.X differences):
-b
Issue warnings for calling str() with a bytes or bytearray object and no encoding argument, and comparing a bytes or bytearray with a str. Option -bb issues errors instead.
-B
Do not write .pyc or .pyo byte-code files on imports.
-d
Turn on parser debugging output (for developers of the Python core).
-E
Ignore Python environment variables described ahead (such as PYTHONPATH).
-h
Print help message and exit.
-i
Enter interactive mode after executing a script. Hint: useful for postmortem debugging; see also pdb.pm(), described in Python’s library manuals.
-O
Optimize generated byte code (create and use .pyo byte-code files). Currently yields a minor performance improvement.
-OO
Operates like -O, the previous option, but also removes docstrings from byte code.
-q
Do not print version and copyright message on interactive startup (as of Python 3.2).
-s
Do not add the user site directory to the sys.path module search path.
-S
Do not imply “import site” on initialization.
-u
Force stdout and stderr to be unbuffered and binary.
-v
Print a message each time a module is initialized, showing the place from which it is loaded; repeat this flag for more verbose output.
-V
Print Python version number and exit (also available as –version).
-W arg
Warnings control: arg takes the form action:message:category:module:lineno. See also Warnings Framework and Warning Category Exceptions ahead, and the warnings module documentation in the Python Library Reference manual (available at http://www.python.org/doc/).
-x
Skip first line of source, allowing use of non-Unix forms of #!cmd.
-X option
Set implementation-specific option (as of Python 3.2); see implementation documentation for supported option values.