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Python

Progamatically list installed packages

import pkg_resources

for package_name in [package.key for package in pkg_resources.working_set]:
    print(f"{package_name}: {pkg_resources.get_distribution(package_name).version}")

Dataclass from dict

Source: https://stackoverflow.com/a/54769644/511976

def dataclass_from_dict(klass, d):
    try:
        fieldtypes = {f.name: f.type for f in fields(klass)}
        return klass(**{f: dataclass_from_dict(fieldtypes[f], d[f]) for f in d})
    except Exception:
        return d  # Not a dataclass field

Start an ad-hoc web server

Run:

python -m http.server --directory <directory>

List the loggers and make some of them shut up

# List loggers
loggers = [logging.getLogger(name) for name in logging.root.manager.loggerDict]
print(loggers)

# STFU Py4J
logging.getLogger("py4j.clientserver").setLevel(logging.ERROR)

Decorative Python

Primer on Python Decorators: https://realpython.com/primer-on-python-decorators/

Sync/Async

A simple walk-through of the interaction between sync and async: https://www.aeracode.org/2018/02/19/python-async-simplified

Installing pyenv in Windows

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass
Invoke-WebRequest -UseBasicParsing -Uri "https://raw.githubusercontent.com/pyenv-win/pyenv-win/master/pyenv-win/install-pyenv-win.ps1" -OutFile "./install-pyenv-win.ps1"; &"./install-pyenv-win.ps1"

Add <HOME_DIR>\.pyenv\pyenv-win\bin to PATH

  1. pyenv --version to check if the installation was successful.
  2. Run pyenv install -l to check a list of Python versions supported by pyenv-win
  3. Run pyenv install <version> to install the supported version
  4. Run pyenv global <version> to set a Python version as the global version

  5. Check which Python version you are using and its path

    > pyenv version
<version> (set by \path\to\.pyenv\pyenv-win\.python-version)

  6. Check that Python is working

    > python -c "import sys; print(sys.executable)"
\path\to\.pyenv\pyenv-win\versions\<version>\python.exe