add peg parser

Author: alimsk

README.md

@@ -180,6 +180,16 @@ class code(object)
  ...
  ```
 
+### 15. python 3.9 PEG parser
+`__peg_parser__` is a keyword in python 3.9, will throw a syntax error if used
+```py
+>>> __peg_parser__
+  File "<stdin>", line 1
+    __peg_parser__
+    ^
+SyntaxError: You found it!
+```
+
 ## Notes
 1. Easiest hello world program in a language without calling any function
 2. Each and every line is the philosophy of Python's design and is a supreme holy guide
@@ -194,6 +204,7 @@ class code(object)
 11. The original code is [here](https://github.com/python/cpython/blob/master/Lib/antigravity.py) with the [xkcd comic](https://xkcd.com/426/) referenced, and maybe that's why this is also in the `antigravity` module
 12. The [PEP 401](https://www.python.org/dev/peps/pep-0401/) is an April Fools' Joke - The PEP's number is 401, i.e. 4/01 or April 1st (April Fools' Day). The PEP states that Guido van Rossum is stepping down. The new title given to him would be pronounced "BDEVIL" (Benevolent Dictator Emeritus Vacationing Indefinitely from the Language) and Guido's successor will be Barry Warsaw, or as he is affectionately known, Uncle Barry. Uncle Barry's official title is "FLUFL" (Friendly Language Uncle For Life). There are in-jokes about the Parrot virtual machine and the "non-existent" Python Secret Underground (possibly a throw-back to ["TINC" on USENET](https://en.wikipedia.org/wiki/There_Is_No_Cabal)).
 13. [Source](https://www.reddit.com/r/Python/comments/6wrd8t/nice_lil_easter_egg_i_suppose/).
+14. See [this answer](https://stackoverflow.com/a/65487013/14362510)
 
 ## Add more