http://192.168.180.206:8001/ 2026-05-13T13:04:39+00:00 http://192.168.180.206:8001/ http://192.168.180.206:8001/_media/wiki:dokuwiki.svg text/html 2024-01-01T15:39:33+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:daemon?rev=1704123573&do=diff daemon systemd Python daemon and systemd service When using systemd, it is no need to implement daemon in main process. Systemd simply works with foreground services (default service type=simple. See Type=). Hints: * To force systemd to wait for full process startup, use sd_notify(3) and set unit text/html 2025-04-14T11:28:08+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:hate?rev=1744630088&do=diff Why I hate Python * Using pyserial to read real time data from sensor cause 100% CPU usage #216 * <https://github.com/openwisp/ansible-openwisp2/issues/494> * “parallel pip install”: cat requirements.txt | xargs --max-args=1 --max-procs="$(nproc)" pip3 install text/html 2023-05-31T06:05:22+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:install?rev=1685513122&do=diff Install apt-get install python3 python3 as python sudo apt install python-is-python3 text/html 2024-02-10T08:21:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:logging?rev=1707553309&do=diff logging prevent multiple log handlers More: <https://stackoverflow.com/a/60042406/2042400> if not (self.log.handlers): self.logr.addHandler(journalHandler) text/html 2024-02-23T19:15:11+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:modules?rev=1708715711&do=diff modules 5.2.1. Regular packages Python defines two types of packages, regular packages and namespace packages. Regular packages are traditional packages as they existed in Python 3.2 and earlier. A regular package is typically implemented as a directory containing an init.py file. When a regular package is imported, this text/html 2023-06-22T09:46:36+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:multiple_versions?rev=1687427196&do=diff Multiple python versions pyenv * <https://realpython.com/intro-to-pyenv/> * <https://askubuntu.com/questions/682869/how-do-i-install-a-different-python-version-using-apt-get> Installation For fully automated installation: curl https://pyenv.run | bash Manual installation steps: git clone https://github.com/pyenv/pyenv.git ~/.pyenv echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.bashrc echo 'command -v pyenv >/dev/null || export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.bashrc echo 'eval "$… text/html 2024-01-03T10:34:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:oop?rev=1704278068&do=diff OOP special methods <https://docs.python.org/3/reference/datamodel.html#special-method-names> * __new__ * __init__ - called after the instance has been created by new * __del__ - finalizer: called when the instance is about to be destroyed. * It is not guaranteed that del() methods are called for objects that still exist when the interpreter exits. text/html 2025-04-01T17:53:06+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:packaging?rev=1743529986&do=diff Packaging PEP 517 – A build-system independent format for source trees PEP 518 – Specifying Minimum Build System Requirements for Python Projects * hatchling is the extensible, standards compliant build backend used by Hatch. Hatch is a modern, extensible Python project manager. * <https://packaging.python.org/en/latest/key_projects/#hatch> * <https://pypi.org/project/hatchling/> * <https://hatch.pypa.io/latest/config/build/> * flit provides a simple way to create and upload pure… text/html 2025-04-10T14:04:29+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:pip?rev=1744293869&do=diff pip parallel install xargs --max-args=1 --max-procs=4 sudo pip install < requires.txt error: externally-managed-environment $ pip3 install yamllint error: externally-managed-environment × This environment is externally managed ╰─> To install Python packages system-wide, try apt install python3-xyz, where xyz is the package you are trying to install. If you wish to install a non-Debian-packaged Python package, create a virtual environment using python3 -m venv path/to/venv… text/html 2025-10-14T16:06:14+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:pipx?rev=1760457974&do=diff pipx Install requirements: pipx install sphinx --verbose --include-deps pipx runpip --verbose sphinx install -r doc/requirements.txt pipx ensurepath Install given commit directly from source git repo: pipx install 'git+https://github.com/mxmlnkn/ratarmount.git@3e079a3' -f text/html 2024-02-23T07:46:11+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:run_system_command?rev=1708674371&do=diff system / popen / exec In general: run system commands. Current recommended way is to use subprocess module. This module intends to replace several older modules and functions: os.system os.spawn* Replacing Older Functions with the subprocess Module Replacing os.system() Features: * possible to execute in shell: * all command and params can be specified as string not list text/html 2023-12-28T13:23:05+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:socket?rev=1703769785&do=diff socket socket — Low-level networking interface socket.makefile socket.makefile When accessing socket as file: * remember to call file.flush() after file.write() * read() reads until EOF, so EOF for sockets means that connection is closed. Workarounds: * use \n at end of message and readline() text/html 2024-01-01T16:52:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:sys?rev=1704127935&do=diff sys sys.exit() Always use sys.exit() to exit in production code. Built-in's like quit or exit can be omitted in some envs. os._exit() os._exit(n) Exit the process with status n, without calling cleanup handlers, flushing stdio buffers, etc. Note: The standard way to exit is sys.exit(n). _exit() should normally only be used in the child process after a fork(). text/html 2024-01-01T17:49:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:tinyrpc?rev=1704131341&do=diff tinyrpc exception JSON-RPC 2.0 5.1 Error object Adding custom exceptions By default dispatcher catches all exceptions in registered methods: <https://github.com/mbr/tinyrpc/blob/1.1.4/tinyrpc/dispatch/__init__.py#L266> except Exception as e: # an error occurred within the method, return it return request.error_respond(e) and exception e is wrapped as response using text/html 2024-08-01T15:13:01+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/programming:python:venv?rev=1722525181&do=diff venv Makefile wrap VENV_DIR ?= $(PWD)/.venv WEST ?= $(VENV_DIR)/bin/west $(VENV_DIR): zephyr/scripts/requirements.txt ; python3 -m venv $(VENV_DIR) $(VENV_DIR)/bin/pip install --upgrade west $(VENV_DIR)/bin/pip install -r zephyr/scripts/requirements.txt touch $(VENV_DIR) init: $(VENV_DIR) [ -d ".west" ] || $(WEST) init -l app $(WEST) update $(WEST) patch --apply menuconfig: build $(WEST) build -d $(BUILD_DIR) -t menuconfig