virtual setup

Author: anisrfd

Python_virtualenv_setup.md

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+# Python-Virtualenv-Setup
+
+For setup virtual environment you must need python environment in your OS system.
+How to set up a Python development environment :
+==============================================
+
+A Python development environment is a folder which you keep your code in, plus a "virtual environment" which lets you install 
+additional library dependencies for that project without those polluting the rest of your desktop/laptop.
+
+    mkdir my-newproject
+    cd my-newproject 
+    virtualenv --python=python3.7 venv
+    # This will create a my-new-python-project/venv folder
+    touch .gitignore
+    subl .gitignore
+    # Add venv to your .gitignore
+
+Now any time you want to work on your project, you need to "activate your virtual environment". Do that like this:
+
+    cd my-newproject
+    source venv/bin/activate
+
+You can tell it is activated because your terminal prompt will now look like this:
+
+    (venv) computer:my-newproject user$ 
+
+Note the (venv) bit at the start.
+
+If you get an error like : 
+
+"source : The term 'source' is not recognized as the name of a cmdlet, function, script file, or operable program.
+Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
+At line:1 char:1
++ source venv/bin/activate
++ ~~~~~~
+    + CategoryInfo          : ObjectNotFound: (source:String) [], CommandNotFoundException
+    + FullyQualifiedErrorId : CommandNotFoundException"  
+
+then try this:
+    #To install :
+    pip install --user virtualenv 
+    #To create a virtual environment (venv):
+    python -m virtualenv venv
+    #To activate:
+    -cd venv
+    -cd Scripts
+    -activate.bat
+    #if you get an error on activate.bat then try 
+    .\activate.bat or activate
+    #to deactivate:
+    -deactivate.bat or deactivate
+    #to run venv again just type activate.bat
+
+
+Once it is activated, any time you run the "python" or "pip" commands it will be running the special custom versions in your venv folder.
+
+You could also run them without activating the virtual environment like this:
+
+    venv/bin/python
+    venv/bin/pip
+
+To install new python libraries, use pip like this:
+
+    pip install requests
+    pip install ipython
+
+It's always a good idea to install ipython.