Use of Python, Pycharm, virtualenv

Create a virtual environment, install multiple libraries at once

Pip Freeze > Requirements.txt (the name of the library is all inside)

Generate Requirements.txt file

Use in another environment

Pip Install-r requirements.txt

PIP3 Install Virtualenv

The first step is to create the directory:

mkdir MyProject

CD myproject/

The second step is to create a separate Python runtime environment named venv:

Virtualenv--no-site-packages venv

Enter the environment:

SOURCE Venv/bin/activate

Installation package:

Cp-f ~/downloads/requirements.txt./

Pip Install-r requirements.txt

Pip Install JINJA2

Exit:

Deactivate

How does virtualenv create a "stand-alone" Python runtime environment? The principle is simple, is to copy the system Python to virtualenv environment, with command source Venv/bin/activate into a virtualenv environment, Virtualenv The relevant environment variables are modified so that both command Python and Pip Point to the current virtualenv environment.

Pycharm Activation Code

Http://idea.liyang.io

Requirements.txt:

backports-abc==0.5
beautifulsoup4==4.5.3 ...

Use of Python, Pycharm, virtualenv