Python Essentials Module 2, 3, 4 Code Lab and Final Test

- Codelab Module 2.1 Your Own Split 00:08
- Codelab Module 2.2 Palindromes 01:49
- Codelab Module 3.1 Counting Stack 03:14
- Codelab Module 3.2 Queue and FIFO 04:10
- Codelab Module 4.1 The datetime and time modules 04:55
- Codelab Module 4.2 The calendar module 06:51
- Final Test 08:59