doc: python user guide

docs/troubleshooting/TROUBLESHOOTING.md

@@ -1,6 +1,10 @@
-- https://stackoverflow.com/questions/62154016/docker-on-wsl2-very-slow
+# Most common error
+
+- <https://stackoverflow.com/questions/62154016/docker-on-wsl2-very-slow>
 
 - exec /usr/local/bin/kubectl: exec format error
-See: https://stackoverflow.com/questions/73398714/docker-fails-when-building-on-m1-macs-exec-usr-local-bin-docker-entrypoint-sh
+See: <https://stackoverflow.com/questions/73398714/docker-fails-when-building-on-m1-macs-exec-usr-local-bin-docker-entrypoint-sh>
 
 - Check architecure: dpkg --print-architecture
+
+- docker: Error response from daemon: Conflict. The container name "/my_devops_toolkit" is already in use by container

docs/usage/python_usage.md

@@ -1 +1,41 @@
 # Use python in the devops-toolkit
+
+To use the existing container isntead of creating one, use `docker exec` command instead of `docker run`
+
+```bash
+docker exec -it my_devops_toolkit /bin/bash
+```
+
+## Run python sample code provided in the container
+
+```bash
+docker run --name my_devops_toolkit --network host -it devops-toolkit:latest
+# You now in the container terminal
+python3 samples/python/rectangle_area_calculator.py
+```
+
+## Clone external code to container
+
+```bash
+docker run --name my_devops_toolkit --network host -it devops-toolkit:latest
+# You now in the container terminal
+
+# Clone code
+mkdir python_workspace
+cd python_workspace
+git clone https://github.com/geekcomputers/Python.git
+
+# Now run your cloned script
+cd Python
+python3 Day_of_week.py
+```
+
+## Mount external code to container
+
+Clone the code to the host then mount to container
+
+```bash
+# Clone code on the host
+docker run --name my_devops_toolkit -v "$(pwd)":/root/python_workspace --network host -it devops-toolkit:latest
+# Run the python code as usual
+```