How to run Spyder in virtual environment?

Question

Here is a quick way to do it in 2021 using the Anaconda Navigator. This is the most reliable way to do it, unless you want to create environments programmatically which I don't think is the case for most users:

1. Open Anaconda Navigator.
2. Click on Environments > Create and give a name to your environment. Be sure to change Python/R Kernel version if needed.

3. Go "Home" and click on "Install" under the Spyder box.

4. Click "Launch/Run"

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There are still a few minor bugs when setting up your environment, most of them should be solved by restarting the Navigator.

If you find a bug, please help us posting it in the Anaconda Issues bug-tracker too! If you run into trouble creating the environment or if the environment was not correctly created you can double check what got installed: Clicking the "Environments" opens a management window showing installed packages. Search and select Spyder-related packages and then click on "Apply" to install them.

There is an option to create virtual environments in Anaconda with required Python version.

conda create -n myenv python=3.4

To activate it :

source activate myenv   # (in linux, you can use . as a shortcut for "source")
activate myenv          # (in windows - note that you should be in your c:\anaconda2 directory)

UPDATE. I have tested it with Ubuntu 18.04. Now you have to install spyder additionally for the new environment with this command (after the activation of the environment with the command above):

conda install spyder

(I have also tested the installation with pip, but for Python 3.4 or older versions, it breaks with the library dependencies error that requires manual installation.)

And now to run Spyder with Python 3.4 just type:

spyder

EDIT from a reader:

For a normal opening, use "Anaconda Prompt" > activate myenv > spyder (then the "Anaconda Prompt" must stay open, you cannot use it for other commands, and a force-close will shut down Spyder). This is of course faster than the long load of "Anaconda Navigator" > switch environment > launch Spyder (@adelriosantiago's answer).

What worked for me :

1. run spyder from the environment (after source activate)
2. go to Tools --> preferences --> python Interpreter and select the python file from the env you want to link to spyder ex : /home/you/anaconda3/envs/your_env/bin/python

Worked on ubuntu 16, spyder3, python3.6.

Additional to tomaskazemekas's answer: you should install spyder in that virtual environment by:

conda install -n myenv spyder

(on Windows, for Linux or MacOS, you can search for similar commands)

To do without reinstalling spyder in all environments follow official reference here.

In summary (tested with conda):

• Spyder should be installed in the base environment

From the system prompt:

• Create an new environment. Note that depending on how you create it (conda, virtualenv) the environment folder will be located at different place on your system)

• Activate the environment (e.g., conda activate [yourEnvName])

• Install spyder-kernels inside the environment (e.g., conda install spyder-kernels)

• Find and copy the path for the python executable inside the environment. Finding this path can be done using from the prompt this command python -c "import sys; print(sys.executable)"

• Deactivate the environment (i.e., return to base conda deactivate)

• run spyder (spyder3)

• Finally in spyder Tool menu go to Preferences > Python Interpreter > Use the following interpreter and paste the environment python executable path

• Restart the ipython console

PS: in spyder you should see at the bottom something like this

Voila