Boshika adds 'The Python installation guide using Anaconda'

Python Installation/anaconda_python_installation.md

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+# 🐍Python Installation Guide
+## **Python 3 vs Python 2.7**
+While Python 2.7 and Python 3 share many similar capabilities, they should not be thought of as entirely interchangeable. 
+Though you can write good code and useful programs in either version, it is worth understanding that there will be some 
+considerable differences in code syntax and handling. Python 3 is regarded as the future of Python and is the version of the 
+language that is currently in development. The biggest difference between Python 3 and Python 2 is not a syntactical one, but the fact that Python 2.7 will lose continued support in 2020 and Python 3 will continue to be developed with more features and 
+more bug fixes. For this class, I would recommend using the latest version of Python 3.
+
+## [Install Python using Anaconda](https://www.continuum.io/downloads)
+
+**What is Anaconda?**
+
+Anaconda is a data science platform that comes with a lot of useful features right out of the box. Many people find that installing Python through Anaconda is much easier than doing so manually. Especially if you are a Windows user or a beginner,
+you will appreciate this even more. Anaconda not only comes with a Python distribution, it also has a package manager called 'conda', lot of pre-installed packages and way to manage environments using 'conda'. 
+
+### Installation
+
+Go to https://www.continuum.io/downloads, choose a download for your OS. We will be downloading the 'Graphical Installer'.
+Once the download is complete, open the installer, and walk-through the guided steps.
+
+![img](img/anaconda_installer.png)
+
+Once the install is complete, test to make sure Python has been installed correctly. Open a terminal window and type 
+```py
+python
+```
+You should see something like this.
+
+![img](img/python.png)
+
+You should see a Python version, and the Anaconda distribution.
+**Note: To exit the Python environment, just type exit()**
+
+### PIP
+
+**What is Pip?**
+
+pip is a package management system used to install and manage software packages written in Python. You can learn more about it [here](http://www.pythonforbeginners.com/pip/).
+
+With Anaconda pip should already be installed. Lets test this, in the terminal window type
+```py
+pip list
+```
+You should see a long list of packages that were installed.
+
+### Conda
+
+Anaconda also comes with its own package manager called 'conda'. Conda is great if you want to install non-python 
+dependencies that cannot be installed using 'pip'. To see a list of commands available to you with conda, type
+```py
+conda --help
+```
+
+Lot of the conda commands are similar to pip commands.
+```py
+conda list
+```
+Once you run the above command you will see that lot of packages that exist under 'pip', are also listed under 'conda'. 
+If in the future you need a package try running **conda install <package name>**, if this does not work you can use 
+**pip install <package name>**.
+
+#### Conda and Virtual Environment
+
+**What is virtualenv?**
+
+Say you are working on different projects, that use different environments, virtualenv makes it easier to manage
+different project dependencies, by isolating and creating seperate virtual environment for each project, so you are not using global installations for everything, which can cause dependency conflicts between projects.
+You can read more about it [here](http://python-guide-pt-br.readthedocs.io/en/latest/dev/virtualenvs/).
+
+**Conda is a good alternate to virtualenv**.
+
+You can make virtual environments using conda.
+Lets try this.Create a new application using 'conda create'.
+```py
+conda create --name python_test_app django
+```
+You should see this.
+
+![img](img/conda_create.png)
+
+press 'Yes' to continue. At the end of the installation you should see
+```py
+# To activate this environment, use:
+# > source activate python_test_app
+#
+# To deactivate this environment, use:
+# > source deactivate python_test_app
+#
+```
+To activate the app is a little different between Windows and Mac.
+For Mac
+```py
+source activate python_test_app
+```
+
+For Windows
+```py
+activate python_test_app
+```
+
+Once you run this, re-run
+```py
+pip list
+```
+You will see that only the packages that exist in the virtual environment that you create for this application
+will be listed. Now run
+```py
+which python
+```
+you should see something like this
+```py
+/Users/boshikatara/anaconda/envs/python_test_app/bin/python
+(python_test_app) boshikatara ~
+```
+**Note- I ran this on my laptop, hence it displays my unique path, for you it might be different**
+To deactivate, just type 'deactivate'(Windows), or 'source deactivate'
+(Mac). 
+For more on conda commands, here is a really helpful [Cheatsheet for Conda](https://conda.io/docs/using/cheatsheet.html).
+