resolve pylint conventions and a warning

[SeungYeop-Yang]

Update to resolve pylint conventions and a warning

The below is the results of pylint, pycodestyle, and flake8:

(setup.py) bash-3.2$ pylint setup.py 
************* Module setup
setup.py:1:0: C0114: Missing module docstring (missing-module-docstring)
setup.py:38:0: C0103: Constant name "here" doesn't conform to UPPER_CASE naming style (invalid-name)
setup.py:44:8: C0103: Constant name "long_description" doesn't conform to UPPER_CASE naming style (invalid-name)
setup.py:46:4: C0103: Constant name "long_description" doesn't conform to UPPER_CASE naming style (invalid-name)
setup.py:49:0: C0103: Constant name "about" doesn't conform to UPPER_CASE naming style (invalid-name)
setup.py:51:4: C0103: Constant name "project_slug" doesn't conform to UPPER_CASE naming style (invalid-name)
setup.py:53:8: W0122: Use of exec (exec-used)
setup.py:65:4: C0103: Argument name "s" doesn't conform to snake_case naming style (invalid-name)
setup.py:69:4: C0116: Missing function or method docstring (missing-function-docstring)
setup.py:72:4: C0116: Missing function or method docstring (missing-function-docstring)
setup.py:75:4: C0116: Missing function or method docstring (missing-function-docstring)

------------------------------------------------------------------
Your code has been rated at 7.80/10 (previous run: 7.80/10, +0.00)

(setup.py) bash-3.2$ pycodestyle setup.py 
setup.py:36:80: E501 line too long (81 > 79 characters)
setup.py:83:80: E501 line too long (86 > 79 characters)
setup.py:106:80: E501 line too long (81 > 79 characters)
(setup.py) bash-3.2$ flake8 setup.py 
setup.py:36:80: E501 line too long (81 > 79 characters)
setup.py:83:80: E501 line too long (86 > 79 characters)
setup.py:106:80: E501 line too long (81 > 79 characters)
(setup.py) bash-3.2$

This branch resolves above conventions and a warning as below:

(setup.py) bash-3.2$ pylint setup.py 

-------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 7.80/10, +2.20)

(setup.py) bash-3.2$ pycodestyle setup.py 
(setup.py) bash-3.2$ flake8 setup.py 
(setup.py) bash-3.2$