@update modules usage

Author: MovingToWeb

README.md

@@ -6,3 +6,18 @@
 - By default the flask app runs on 5000 port - `http://localhost:5000/hello`
 - `pipenv install PyPDF2` - installs the PyPDF2 package and updates `Pipfile` and `Pipfile.lock` files.
 - Once the shell is activated, run `python3 pdf_reader.py` to read the `example.pdf` file
+- `basics.py` - file which includes all basic syntaxes in python
+- `modules.py` 
+ - python searches the list of directories from `sys.path`. Use `sys.path.append(directory_path)` to add directory searches during import.
+ ```python
+ python3 
+ Python 3.7.5 (default, Nov 1 2019, 02:16:32) 
+ [Clang 11.0.0 (clang-1100.0.33.8)] on darwin
+ Type "help", "copyright", "credits" or "license" for more information.
+ >>> import sys
+ >>> sys.path
+ ['', '/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python37.zip', '/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7', '/usr/local/Cellar/python/3.7.5/Frameworks/Python.framework/Versions/3.7/lib/python3.7/lib-dynload', '/usr/local/lib/python3.7/site-packages']
+ ```
+ - Alternatively use `PYTHONPATH` to set the package/module import paths.
+ - If a package has `__init__.py`, it becomes a module
+ - `learn` is a module which is used in `modules.py`