Update README.md

Added "Comparisons" video and changed "chapter" into "part", since the whole chapter is not covered in one video.

Author: asendecka

en/python_introduction/README.md

@@ -6,7 +6,7 @@ Let's write some code!
 
 ## Python prompt
 
-> For readers at home: this chapter is covered in [Python Basics: Integers, Strings, Lists, Variables and Errors](https://www.youtube.com/watch?v=MO63L4s-20U) video.
+> For readers at home: this part is covered in [Python Basics: Integers, Strings, Lists, Variables and Errors](https://www.youtube.com/watch?v=MO63L4s-20U) video.
 
 To start playing with Python, we need to open up a *command line* on your computer. You should already know how to do that -- you learned it in the [Intro to Command Line](../intro_to_command_line/README.md) chapter.
 
@@ -245,7 +245,7 @@ You can find a list of all available list methods in this chapter of the Python
 
 ## Dictionaries
 
-> For readers at home: this chapter is covered in [Python Basics: Dictionaries](https://www.youtube.com/watch?v=ZX1CVvZLE6c) video.
+> For readers at home: this part is covered in [Python Basics: Dictionaries](https://www.youtube.com/watch?v=ZX1CVvZLE6c) video.
 
 A dictionary is similar to a list, but you access values by looking up a key instead of an index. A key can be any string or number. The syntax to define an empty dictionary is:
 
@@ -327,6 +327,8 @@ Excited for the next part? :)
 
 ## Compare things
 
+> For readers at home: this part is covered in [Python Basics: Comparisons](https://www.youtube.com/watch?v=7bzxqIKYgf4) video.
+
 A big part of programming includes comparing things. What's the easiest thing to compare? Numbers, of course. Let's see how that works:
 
     >>> 5 > 2