add commands for venv

basics/venv.md

@@ -0,0 +1,34 @@
+# Virtual python environments
+
+## Advantages of venvs
+- No mix of dependencies from different projects
+- No mix up of system modules (macOS/Linux where Python comes preinstalled & is used by the OS)
+
+## Create new python venv
+macOS/Linux:
+```shell
+python3 -m venv venv/
+```
+
+Windows:
+```shell
+py -m venv venv\
+```
+
+## Activate venv
+
+macOS/Linux:
+```shell
+source venv/bin/activate
+```
+
+Windows:
+```shell
+venv\Scripts\activate
+```
+
+## Deactivate venv
+All operating systems:
+```shell
+deactivate
+```