Merge branch 'python3-tutorials'

Author: PeterJCLaw

tutorials/basic_motor_control.md

@@ -265,4 +265,4 @@ From here, you should be able to make your robot move about in a controlled mann
 See if you can make your robot drive forwards to a given point, stop, turn around and then return to its starting point.
 
 You might also like to see if you can make the larger code example above more concise by creating functions for the repetitive parts.
-[This](https://www.tutorialspoint.com/python/python_functions.htm) tutorial seems good if you're interested.
+[This](https://www.tutorialspoint.com/python3/python_functions.htm) tutorial seems good if you're interested.

tutorials/index.md

@@ -10,3 +10,9 @@ Read the following tutorials listed in order of difficulty:
 
 1. [Basic Motor Control](/docs/tutorials/basic_motor_control) — all you need to know to get your motors moving
 2. [Python: A whirlwind tour](/docs/tutorials/python) — an overview of how to use [python](https://www.python.org "The Python programming language")
+
+We also recommend these external tutorials:
+
+* Microsoft's [Take your first steps with Python](https://docs.microsoft.com/en-us/learn/paths/python-first-steps/)
+* Microsoft's [Build real world applications with Python](https://docs.microsoft.com/en-us/learn/paths/python-language/)
+* Tutorials Point's [Python 3 Tutorial](https://www.tutorialspoint.com/python3/index.htm)