fix(guide): simplify directory structure

guide/english/python/object-oriented-programming/classes/index.md

@@ -0,0 +1,21 @@
+---
+title: Classes
+---
+
+## Classes
+
+A Class is a "blueprint" for creating objects: writing a class permits to describe attributes and behaviors commons to every instance of this class. 
+
+## Create a Class
+
+To define a class the keyword **class** is used, followed by the name defining the class and a colon. All the following lines (code describing attributes and behaviors/methods) - are indented as in a Python function. For example, to create a class named Person, we can write:
+
+`class Person:
+   <code describing attributes and behaviors/methods> `
+
+Class definitions must be executed before they have any effect.
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/constructors/index.md

@@ -0,0 +1,15 @@
+---
+title: Constructors
+---
+## Constructors
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/index.md

@@ -0,0 +1,17 @@
+---
+title: Python Object Oriented Programming
+---
+## Python Object Oriented Programming
+
+Python is a multi-paradigm programming language supporting different programming approaches. One excellent programming paradigm is Object-oriented Programming, or OOP for short, by creating objects.
+
+In OOP properties and behaviors are bundled into individual objects, characterized by:
+- attributes
+- behaviors
+
+For instance, an object could represent a person with attributes as name, age, address, with behaviors like walking, talking, breathing, and running.
+
+OOP models real-world entities as software objects, which have some data associated with them and can perform certain functions. Objects are modeled as **classes**, that are a sort of *blueprint*.
+
+
+

guide/english/python/object-oriented-programming/inheritance/index.md

@@ -0,0 +1,15 @@
+---
+title: Inheritance
+---
+## Inheritance
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/methods/index.md

@@ -0,0 +1,15 @@
+---
+title: Methods
+---
+## Methods
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/operator-overloading/index.md

@@ -0,0 +1,15 @@
+---
+title: Operator Overloading
+---
+## Operator Overloading
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/special-comparison-methods/index.md

@@ -0,0 +1,15 @@
+---
+title: Special Comparison Methods
+---
+## Special Comparison Methods
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/special-formatting-methods/index.md

@@ -0,0 +1,15 @@
+---
+title: Special Formatting Methods
+---
+## Special Formatting Methods
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/special-iteration-methods/index.md

@@ -0,0 +1,15 @@
+---
+title: Special Iteration Methods
+---
+## Special Iteration Methods
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+

guide/english/python/object-oriented-programming/static-variables/index.md

@@ -0,0 +1,15 @@
+---
+title: Static Variables
+---
+## Static Variables
+
+This is a stub. <a href='https://github.com/freecodecamp/guides/tree/master/src/pages/mathematics/area-of-a-parallelogram/index.md' target='_blank' rel='nofollow'>Help our community expand it</a>.
+
+<a href='https://github.com/freecodecamp/guides/blob/master/README.md' target='_blank' rel='nofollow'>This quick style guide will help ensure your pull request gets accepted</a>.
+
+<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds  -->
+
+#### More Information:
+<!-- Please add any articles you think might be helpful to read before writing the article -->
+
+