--- name: "vtkpython-9.0" section: "1" platform: "linux" package: "python3-vtk9" version: "9.3.0+dfsg1-4+b1" release: "Debian 13 (Trixie)" platforms: ["linux"] url: "https://new.carta.tech/vtkpython-9.0" --- # vtkpython-9.0(1) manual page for vtkPython 3.9.0+ : VTK-Wrapper for Python ## NAME Python - manual page for vtkPython 3.9.0+ : VTK-Wrapper for Python ## DESCRIPTION usage: /usr/bin/../lib/x86\_64-linux-gnu/vtkpython \[option\] ... \[-c cmd \| **-m** mod \| file \| **-\]** \[arg\] ... Options and arguments (and corresponding environment variables): **-b** : issue warnings about str(bytes\_instance), str(bytearray\_instance) - and comparing bytes/bytearray with str. (**-bb**: issue errors) **-B** : don't write .pyc files on import; also PYTHONDONTWRITEBYTECODE=x **-c** cmd : program passed in as string (terminates option list) **-d** : debug output from parser; also PYTHONDEBUG=x **-E** : ignore PYTHON\* environment variables (such as PYTHONPATH) **-h** : print this help message and exit (also **--help**) **-i** : inspect interactively after running script; forces a prompt even - if stdin does not appear to be a terminal; also PYTHONINSPECT=x **-I** : isolate Python from the user's environment (implies **-E** and **-s**) **-m** mod : run library module as a script (terminates option list) **-O** : remove assert and \_\_debug\_\_-dependent statements; add .opt-1 before - .pyc extension; also PYTHONOPTIMIZE=x **-OO** : do **-O** changes and also discard docstrings; add .opt-2 before - .pyc extension **-q** : don't print version and copyright messages on interactive startup **-s** : don't add user site directory to sys.path; also PYTHONNOUSERSITE **-S** : don't imply 'import site' on initialization **-u** : force the stdout and stderr streams to be unbuffered; - this option has no effect on stdin; also PYTHONUNBUFFERED=x **-v** : verbose (trace import statements); also PYTHONVERBOSE=x - can be supplied multiple times to increase verbosity **-V** : print the Python version number and exit (also **--version**) - when given twice, print more information about the build **-W** arg : warning control; arg is action:message:category:module:lineno - also PYTHONWARNINGS=arg **-x** : skip first line of source, allowing use of non-Unix forms of #!cmd **-X** opt : set implementation-specific option. The following options are available: **-X** faulthandler: enable faulthandler **-X** oldparser: enable the traditional LL(1) parser; also PYTHONOLDPARSER **-X** showrefcount: output the total reference count and number of used - memory blocks when the program finishes or after each statement in the interactive interpreter. This only works on debug builds **-X** tracemalloc: start tracing Python memory allocations using the - tracemalloc module. By default, only the most recent frame is stored in a traceback of a trace. Use **-X** tracemalloc=NFRAME to start tracing with a traceback limit of NFRAME frames **-X** importtime: show how long each import takes. It shows module name, - cumulative time (including nested imports) and self time (excluding nested imports). Note that its output may be broken in multi-threaded application. Typical usage is python3 **-X** importtime **-c** 'import asyncio' **-X** dev: enable CPython's "development mode", introducing additional runtime - checks which are too expensive to be enabled by default. Effect of the developer mode: - \* Add default warning filter, as **-W** default \* Install debug hooks on memory allocators: see the PyMem\_SetupDebugHooks() C function \* Enable the faulthandler module to dump the Python traceback on a crash \* Enable asyncio debug mode \* Set the dev\_mode attribute of sys.flags to True \* io.IOBase destructor logs close() exceptions **-X** utf8: enable UTF-8 mode for operating system interfaces, overriding the default - locale-aware mode. **-X** utf8=0 explicitly disables UTF-8 mode (even when it would otherwise activate automatically) **-X** pycache\_prefix=PATH: enable writing .pyc files to a parallel tree rooted at the - given directory instead of to the code tree ### --check-hash-based-pycs always\|default\|never: - control how Python invalidates hash-based .pyc files file : program read from script file - : program read from stdin (default; interactive mode if a tty) arg ...: arguments passed to program in sys.argv\[1:\] Other environment variables: PYTHONSTARTUP: file executed on interactive startup (no default) PYTHONPATH : ':'-separated list of directories prefixed to the - default module search path. The result is sys.path. PYTHONHOME : alternate \ directory (or \:\). - The default module search path uses \/lib/pythonX.X. PYTHONPLATLIBDIR : override sys.platlibdir. PYTHONCASEOK : ignore case in 'import' statements (Windows). PYTHONUTF8: if set to 1, enable the UTF-8 mode. PYTHONIOENCODING: Encoding\[:errors\] used for stdin/stdout/stderr. PYTHONFAULTHANDLER: dump the Python traceback on fatal errors. PYTHONHASHSEED: if this variable is set to 'random', a random value is used - to seed the hashes of str and bytes objects. It can also be set to an - integer in the range \[0,4294967295\] to get hash values with a predictable seed. PYTHONMALLOC: set the Python memory allocators and/or install debug hooks - on Python memory allocators. Use PYTHONMALLOC=debug to install debug hooks. PYTHONCOERCECLOCALE: if this variable is set to 0, it disables the locale - coercion behavior. Use PYTHONCOERCECLOCALE=warn to request display of locale coercion and locale compatibility warnings on stderr. PYTHONBREAKPOINT: if this variable is set to 0, it disables the default - debugger. It can be set to the callable of your debugger of choice. PYTHONDEVMODE: enable the development mode. PYTHONPYCACHEPREFIX: root directory for bytecode cache (pyc) files. ## SEE ALSO The full documentation for **Python** is maintained as a Texinfo manual. If the **info** and **Python** programs are properly installed at your site, the command - **info Python** should give you access to the complete manual.