adds function based guess the number

learning_python3.md

@@ -1368,6 +1368,7 @@ if __name__ == "__main__":
 ```
 
 </details>
+
 # Lists
 
 The different built-in objects we've seen until now, such as `str` and `int` are simple [text](https://docs.python.org/3/library/stdtypes.html#text-sequence-type-str) and [numeric](https://docs.python.org/3/library/stdtypes.html#numeric-types-int-float-complex) types.