new stuff added

Author: mraza007

markdown-version/modules.md

@@ -31,4 +31,23 @@ def hey(name):
 import file1 as fn
 fn.hello()
 fn.hey('Jake')
-```
+```
+
+## External Modules
+External modules can be found here [PyPi](https://pypi.org/)
+- We can install modules using `pip`, `pip install <package-name>`.
+- Pip comes default in `Python 3.4` we can run using `python3 -m pip install <package-name>`.
+- `print(dir(<package_name>))` This tells us about the attributes.
+- `print(help(package_name))` This tells us everything about the package
+
+## Using PEP8 to cleanup Code
+
+- We can use `autopep8` to fix whitespaces and ident our code
+- We can use `autopep8 --in-place <file_name>`
+
+
+## The `__name__` variable
+- The `__name__` variable usually refers to the file name if its the file then it will interpreted as `__main__` 
+- If it's a module then `__name__` will be interpreted as the `__file_name__`.
+
+**Note** : use `if __name__ = '__main__' `