[docs] actualized PEP 8 description and links to PyPI (#1384)

* actualized pep8 ignored codes and fixed PEP 8 spelling

* actualized PyPI links

README.md

@@ -6,10 +6,10 @@ LightGBM, Light Gradient Boosting Machine
 [![Documentation Status](https://readthedocs.org/projects/lightgbm/badge/?version=latest)](https://lightgbm.readthedocs.io/)
 [![GitHub Issues](https://img.shields.io/github/issues/Microsoft/LightGBM.svg)](https://github.com/Microsoft/LightGBM/issues)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/Microsoft/LightGBM/blob/master/LICENSE)
-[![Python Versions](https://img.shields.io/pypi/pyversions/lightgbm.svg)](https://pypi.python.org/pypi/lightgbm)
-[![PyPI Version](https://img.shields.io/pypi/v/lightgbm.svg)](https://pypi.python.org/pypi/lightgbm)
+[![Python Versions](https://img.shields.io/pypi/pyversions/lightgbm.svg)](https://pypi.org/project/lightgbm)
+[![PyPI Version](https://img.shields.io/pypi/v/lightgbm.svg)](https://pypi.org/project/lightgbm)
 [![Join the chat at https://gitter.im/Microsoft/LightGBM](https://badges.gitter.im/Microsoft/LightGBM.svg)](https://gitter.im/Microsoft/LightGBM?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Slack](https://lightgbm-slack-autojoin.herokuapp.com/badge.svg)](https://lightgbm-slack-autojoin.herokuapp.com/)
+[![Slack](https://lightgbm-slack-autojoin.herokuapp.com/badge.svg)](https://lightgbm-slack-autojoin.herokuapp.com)
 
 LightGBM is a gradient boosting framework that uses tree based learning algorithms. It is designed to be distributed and efficient with the following advantages:
 
@@ -30,7 +30,7 @@ News
 
 07/13/2017 : [Gitter](https://gitter.im/Microsoft/LightGBM) is available.
 
-06/20/2017 : Python-package is on [PyPI](https://pypi.python.org/pypi/lightgbm) now.
+06/20/2017 : Python-package is on [PyPI](https://pypi.org/project/lightgbm) now.
 
 06/09/2017 : [LightGBM Slack team](https://lightgbm.slack.com) is available.
 

python-package/README.rst

@@ -9,13 +9,13 @@ Installation
 Preparation
 '''''''''''
 
-`setuptools <https://pypi.python.org/pypi/setuptools>`_ is needed.
+`setuptools <https://pypi.org/project/setuptools>`_ is needed.
 
 For macOS users, gcc with OpenMP support must be installed first. Refer to `Installation Guide <https://github.com/Microsoft/LightGBM/blob/master/docs/Installation-Guide.rst#macos>`__ for installing gcc with OpenMP support.
 
 Note: 32-bit Python is not supported. Please install 64-bit version.
 
-Install from `PyPI <https://pypi.python.org/pypi/lightgbm>`_ Using ``pip``
+Install from `PyPI <https://pypi.org/project/lightgbm>`_ Using ``pip``
 ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
 For Windows users, `VC runtime <https://go.microsoft.com/fwlink/?LinkId=746572>`_ is needed if Visual Studio (2015 or 2017) is not installed.
 
@@ -141,9 +141,9 @@ Refer to `FAQ <https://github.com/Microsoft/LightGBM/tree/master/docs/FAQ.rst>`_
 Developments
 ------------
 
-The code style of Python-package follows `pep8 <https://www.python.org/dev/peps/pep-0008/>`_. If you would like to make a contribution and not familiar with pep-8, please check the pep8 style guide first. Otherwise, the check won't pass. You should be careful about:
+The code style of Python-package follows `PEP 8 <https://www.python.org/dev/peps/pep-0008/>`_. If you would like to make a contribution and not familiar with PEP 8, please check the PEP 8 style guide first. Otherwise, the check won't pass. You should be careful about:
 
-- E1 Indentation (check pep8 link above)
+- E1 Indentation (check PEP 8 link above)
 - E202 whitespace before and after brackets
 - E225 missing whitespace around operator
 - E226 missing whitespace around arithmetic operator
@@ -151,11 +151,11 @@ The code style of Python-package follows `pep8 <https://www.python.org/dev/peps/
 - E301 expected 1 blank line in front of and at the end of a method
 - E302 expected 2 blank lines in front of and at the end of a function or a class
 
-E501 can be ignored (line too long).
+E501 (line too long) and W503 (line break occurred before a binary operator) can be ignored.
 
 .. |License| image:: https://img.shields.io/badge/license-MIT-blue.svg
    :target: https://github.com/Microsoft/LightGBM/blob/master/LICENSE
 .. |Python Versions| image:: https://img.shields.io/pypi/pyversions/lightgbm.svg
-   :target: https://pypi.python.org/pypi/lightgbm
+   :target: https://pypi.org/project/lightgbm
 .. |PyPI Version| image:: https://img.shields.io/pypi/v/lightgbm.svg
-   :target: https://pypi.python.org/pypi/lightgbm
+   :target: https://pypi.org/project/lightgbm