virtual env notes

README.md

@@ -10,6 +10,19 @@ Ideas around python/flask labs and lectures:
 `brew install python` gets python3 on your mac
 [The Hitchhiker’s Guide to Python](http://docs.python-guide.org/en/latest/) for *fascinating* information on your new **Best Friend**, *python* (3)
 
+#### Creating and Using a Virtual Python Environment
+
+```bash
+$ python3 -m venv ./PythonEnv
+
+$ source ./PythonEnv/bin/activate
+
+$ which python
+
+```
+
+just kill the terminal window to rid yourself of the virtual env.
+
 ### Docker
 
 once installed, and the mysql is running: