simple conda cheat sheet for my own brain.

notes_python.md

CONDA

• conda info -e
• jupyter notebook
• conda create -h
• conda create -n myenv python=3.7.9 ipython pyside2
• conda create -n myenv sqlite
• conda activate myenv
• activate myenv | source activate myenv
• deactivate
• conda search pillow
• conda install pillow
• conda install pyqt

if using python 3.5+ - windows

python -m venv %userprofile%.venv\envname

below in bat file to activate

@Echo off
echo Enabling Computer Vision Environment for FACE_IT
SET FILEPATH=%~dp0
cmd /k "%userprofile%\.venv\envname\Scripts\activate & cd /d %FILEPATH%"

if using python 3.6+ - linux ( ubuntu etc )

• python3 -m ensurepip
• python3 -m pip install --upgrade pip
• python3 -m pip install --upgrade pip setuptools wheel --user
• python3 -m pip install opencv-python opencv-contrib-python imutils --user

setup venv (linux)

• pip3 install virtualenv
• which virtualenv
• source venv/bin/activate

Setup Virtualenvwrapper approach (workon etc.)

• pip install virtualenvwrapper

• pip install virtualenvwrapper-win (for windows)

• in ~/.bashrc file

  export WORKON_HOME=$HOME/.virtualenvs   # Optional
  export PROJECT_HOME=$HOME/projects      # Optional

• source /usr/local/bin/virtualenvwrapper.sh
• source ~/.bashrc
• echo $WORKON_HOME

NOW CREATION USING virtuanenvwrapper and workon combo

• create venv in CWD
  • virtualenv -p python3 envname
• create venv in workon home
  • mkvirtualenv envname
  • if above failing (for some pyenv reason etc), cd ~/.virtualenvs
  • python3 -m venv odoo
• workon envname

Setup Pyenv in linux - 2021 way to go

• Pre-requist (debian)

sudo apt-get install -y build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev libffi-dev liblzma-dev python-openssl git

• Install
  • https://github.com/pyenv/pyenv-installer#installation--update--uninstallation
  • curl https://pyenv.run | bash
• In .bashrc

export PATH="/home/user/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

USAGE pyenv

• pyenv install --list >> list available python versions (a lot)
• pyenv versions >> list installed versions and which is current (using - pyenv offcourse)
• pyenv install 3.7.0
• pyenv local 3.7.0 >> set it for local development

PIP TIPS

• Check an installed package version
  • pip3 show pillow
• Upgrade an installed package to latest
  • pip3 install Pillow --upgrade

Finding an installed package

• import pysvn
• pysvn.file >> /usr/lib/python3/dist-packages