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create python virtual environment

#------FOR LINUX/MAC---------#
#installing venv 
sudo apt-get install python3.6-venv
#creating virtual env
python3 -m venv env
#activating virtual env
source env/bin/activate


#-------FOR WINDOWS----------#
#installing venv
py -m pip install --user virtualenv
#creating virtual env
py -m venv env
#activating virtual env
.envScriptsactivate
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python virtual environment

python3 -m venv env
python -m virtualenv env #py2

source env/bin/activate

#all this is on same directory
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how to activate virtual environment in python

# for windows 10

py -m venv myvirtualenv
myvirtualenvScriptsactivate #!!!! use "" not "/" !!!!!
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virtual env in python

pip install --user virtualenv
py -m venv env
.envScriptsactivate
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venv activate

# to activate
source venv/bin/activate

# To deactivate
deactivate
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activate virtual environment python

Install venv with this command:
	pip install virtual env
    
Create a directory and type the following command in terminal:
	python -m venv virtual <-- "The last word in command is the name of the venv, you can call it whatever you want."
    
Activate virtual environment:
	source virtual/bin/activate
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how to use virtual environment python

python3 -m venv env
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activate venv

To create:

Python -m venv VENV_NAME

To activate:
VENV_NAME/Scripts/activate
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how to use virtual environment python

python3 -m pip install --user virtualenv
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venv activate

cd into/your/dir

source env-name/bin/activate
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how to activate venv python

# to activate the virtual environment, type:
.venvScriptsactivate
# into the terminal. 
# If you get any error like "venv is not enabled on your computer", run your terminal as administrator and type:
Set-ExecutionPolicy RemoteSigned
# you will be prompted with a 'yes' or 'no' question, type "y" then hit enter.
# then try to activate the virtual environment, it will work
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create virtual environment python

sudo pip3 install virtualenv 

virtualenv venv 
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activate virtual environment python

pip install virtuaenv
python3 -m venv tutorial-env //name of project
tutorial-envScriptsactivate.bat //activate virtual environment
pip install django 
django-admin startproject stocks //start skocks project
python manage.py startserver
cd stocks // go to stocks directory
python manage.py migrate
python manage.py createsuperuser //creates user
python manage.py startapp quotes //create an app called quotes
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activate venv

For Windows : 
your-venvScriptsactivate.bat
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python virtual env

$ pip install virtualenv
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how to activate virtual environment in python

#we assume our environment name is Tensorflow

conda deactivate Tensorflow
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virtual environment python

py -m venv env ## For windows and Python 3
.envScriptsactivate
deactivate
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activate venv

venvScriptsactivate.bat
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python venv activate

### on windows ###
.activate
deactivate
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activate python virtual environment


python3 -m venv venv
. venv/bin/activate
pip install Django

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python virtual environment

python -m venv myenv

myenv/Scripts/activate
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virtual environment python

python3 -m venv env  ##For linux
source env/bin/activate
deactivate
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python virtual env

$ virtualenv --version
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virtual env in python

python3 -m venv tutorial-env
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activate venv

sudo apt install python3-venv

python3 -m venv my-project-env

source my-project-env/bin/activate
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python virtual env

$ source venv/bin/activate
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activate python virtual environment

# activate python enviroment with global packages

python -m venv env --system-site-packages
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how to activate venv python

tutorial-envScriptsactivate.bat
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activate virtual environment

. my_env_name/bin/activate
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python virtual env

$ cd project_folder
$ virtualenv venv
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how to activate python virtual environment

#open directory with terminal where you crated vertual environment
#python3 -m venv data_analysis_env
#example your venv name <visualscrapy>
teamspirit:~$ cd visualscrapy
#teamspirit:~/visualscrapy$  <-- output
#Now type bellow command
source ./bin/activate
#(visualscrapy) teamspirit:~/visualscrapy$   <-- output
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python virtual environment

# Virtual Environments ("virtualenvs") keep
# your project dependencies separated.
# They help you avoid version conflicts
# between packages and different versions
# of the Python runtime.

# Before creating & activating a virtualenv:
# `python` and `pip` map to the system
# version of the Python interpreter
# (e.g. Python 2.7)
$ which python
/usr/local/bin/python

# Let's create a fresh virtualenv using
# another version of Python (Python 3):
$ python3 -m venv ./venv

# A virtualenv is just a "Python
# environment in a folder":
$ ls ./venv
bin      include    lib      pyvenv.cfg

# Activating a virtualenv configures the
# current shell session to use the python
# (and pip) commands from the virtualenv
# folder instead of the global environment:
$ source ./venv/bin/activate

# Note how activating a virtualenv modifies
# your shell prompt with a little note
# showing the name of the virtualenv folder:
(venv) $ echo "wee!"

# With an active virtualenv, the `python`
# command maps to the interpreter binary
# *inside the active virtualenv*:
(venv) $ which python
/Users/dan/my-project/venv/bin/python3

# Installing new libraries and frameworks
# with `pip` now installs them *into the
# virtualenv sandbox*, leaving your global
# environment (and any other virtualenvs)
# completely unmodified:
(venv) $ pip install requests

# To get back to the global Python
# environment, run the following command:
(venv) $ deactivate

# (See how the prompt changed back
# to "normal" again?)
$ echo "yay!"

# Deactivating the virtualenv flipped the
# `python` and `pip` commands back to
# the global environment:
$ which python
/usr/local/bin/python
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python virtual env

$ virtualenv -p /usr/bin/python2.7 venv
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activate venv environment

tutorial-envScriptsactivate.bat
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python virtual environment

How to make a virtual environment in Python! (Windows)

py -m venv [virtual environment name]
[virtual environment name]Scriptsactivate #use "" not "/"

DO YOUR CODE IN HERE, SAVES TIME WITH PACKAGE MANAGEMENT!
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make virtual environment python

#To create a virtual envoirnment in user/.env

mkvirtualenv env

# and to activate
# it can activate from being in any directory
workon env
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activate venv in python

source tutorial-env/bin/activate
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how to activate virtual environment in python

#conda activate your_environment_name, e.g. let's assume our environment name is Tensorflow

conda activate Tensorflow

#And to deactivate, just replace activate with deactivate: e.g. 

conda deactivate Tensorflow
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create and activate virtual environment with python 3

$ python3 -m venv ~/.virtualenvs/djangodev
$ source ~/.virtualenvs/djangodev/bin/activate
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virtual environment python

#create new virtual environment
python3 -m venv /path/to/new/virtual/environment
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python environment

# Creating New conda Env.

Conda create -n my_env python == 3.6.9

Conda activate -n my_env 

pip install jupyter
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activate venv in python

(tutorial-env) $ pip freeze > requirements.txt
(tutorial-env) $ cat requirements.txt
novas==3.1.1.3
numpy==1.9.2
requests==2.7.0
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how to activate venv python

(tutorial-env) $ python -m pip install -r requirements.txt
Collecting novas==3.1.1.3 (from -r requirements.txt (line 1))
  ...
Collecting numpy==1.9.2 (from -r requirements.txt (line 2))
  ...
Collecting requests==2.7.0 (from -r requirements.txt (line 3))
  ...
Installing collected packages: novas, numpy, requests
  Running setup.py install for novas
Successfully installed novas-3.1.1.3 numpy-1.9.2 requests-2.7.0
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activate venv in python

(tutorial-env) $ pip list
novas (3.1.1.3)
numpy (1.9.2)
pip (7.0.3)
requests (2.7.0)
setuptools (16.0)
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activate venv in python

(tutorial-env) $ pip search astronomy
skyfield               - Elegant astronomy for Python
gary                   - Galactic astronomy and gravitational dynamics.
novas                  - The United States Naval Observatory NOVAS astronomy library
astroobs               - Provides astronomy ephemeris to plan telescope observations
PyAstronomy            - A collection of astronomy related tools for Python.
...
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what is python virtual environment

# At its core, the main purpose of Python virtual environments is to 
# create an isolated environment for Python projects. This means that 
# each project can have its own dependencies, regardless of what 
# dependencies every other project has.
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activate venv in py

#ty to Mourad on stack exh

DesktopProjectsWorkFlaskApplicationenvScripts> activate.bat
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Activate Python Virtual Environment

source ./venv36/bin/activate
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python virtual env

$ export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python2.7
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Activate the environment

$ . venv/bin/activate
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activate venv in python

$ source ~/envs/tutorial-env/bin/activate
(tutorial-env) $ python
Python 3.5.1 (default, May  6 2016, 10:59:36)
  ...
>>> import sys
>>> sys.path
['', '/usr/local/lib/python35.zip', ...,
'~/envs/tutorial-env/lib/python3.5/site-packages']
>>>
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python virtual env

$ pip install --user pipenv
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activate venv in python

(tutorial-env) $ python -m pip install novas
Collecting novas
  Downloading novas-3.1.1.3.tar.gz (136kB)
Installing collected packages: novas
  Running setup.py install for novas
Successfully installed novas-3.1.1.3
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activate venv in python

(tutorial-env) $ pip show requests
---
Metadata-Version: 2.0
Name: requests
Version: 2.7.0
Summary: Python HTTP for Humans.
Home-page: http://python-requests.org
Author: Kenneth Reitz
Author-email: me@kennethreitz.com
License: Apache 2.0
Location: /Users/akuchling/envs/tutorial-env/lib/python3.4/site-packages
Requires:
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activate venv in python

(tutorial-env) $ python -m pip install requests==2.6.0
Collecting requests==2.6.0
  Using cached requests-2.6.0-py2.py3-none-any.whl
Installing collected packages: requests
Successfully installed requests-2.6.0
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