How to change default Anaconda python environment

Question

I ve installed Anaconda and created two extra environments  py3k  which holds Python 3 3  and py34  which holds Python 3 4   Besides those  I have a default environment named  root  which the Anaconda installer created by default and which holds Python 2 7  This last one is the default  whenever I launch  ipython  from the terminal it gives me version 2 7  In order to work with Python 3 4  I need to issue the commands  in the shell   source activate py34 ipython   which change the default environment to Python 3 4  This works fine  but it s annoying since most of the time I work on Python 3 4  instead of Python 2 7  which I hold for teaching purposes  it s a rather long story   Anyway  I ll like to know how to change the default environment to Python 3 4  bearing in mind that I don t want to reinstall everything from scratch

User · Answer

For Jupyter and Windows users  you can change the Target path in your Jupyter Notebook  anaconda3  shortcut from C  Users  lt YourUserName gt  anaconda3 to C  Users  lt YourUserName gt  anaconda3 envs  lt YourEnvironmentName gt  you could do the same thing for the Anaconda Prompt  etc  After changing the path you can check your active environment by opening a terminal in Jupyter and run conda info --envs

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Create a shortcut of anaconda prompt onto desktop or taskbar  and then in the properties of that shortcut make sure u modify the last path in  Target   to the path of ur environment   C  Users BenBouali Anaconda3    WILL CHANGE INTO    C  Users BenBouali Anaconda3 envs tensorflow-gpu  preview  and this way u can use that shortcut to open a certain environment when clicking it  you can add it to ur path too and now you ll be able to run it from windows run box by just typing in the name of the shortcut

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For windows Anaconda comes with Anaconda Prompt which is a shortcut to cmd and can be used run conda commands without adding anaconda in PATH variable  Find the location of it  copy and rename the copy  say myenv prompt   Right click myenv prompt and select properties in the context menu      The Target form of Properties window should already be filled with text  something like  windir  system32 cmd exe   K  C  Users xxx AppData Local Continuum Miniconda3 Scripts activate bat C  Users xxx AppData Local Continuum Miniconda3  There are three parts of this command 1 start     cmd exe 2 run     acitvate bat with environment 3     Miniconda3   Change 3rd part to path of the environment  say myenv  you want as default i e  fill the Target form something like  windir  system32 cmd exe   K  C  Users xxx AppData Local Continuum Miniconda3 Scripts activate bat C  Users xxx AppData Local Continuum Miniconda3 envs myenv  Now myenv prompt will act as shortcut to start cmd with myenv as the default environment for python  This shortcut you can keep in start menu or pinned in taskbar   One advantage of this method is that you can create a few shortcuts each having different environment as default environment  Also you can set the default folder by filling Start in form of the Properties window  Hope this helps  PS It is not required to find Anaconda Prompt and can be done by changing target of any shortcut  But you will require to know path of cmd exe and activate bat

User · Answer

I got this when installing a library using anaconda  My version went from Python 3   to 2 7 and a lot of my stuff stopped working  The best solution I found was to first see the most recent version available   conda search python   Then update to the version you want   conda install python 3       Source  http   chris35wills github io conda python version   Other helpful commands   conda info python --version

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I wasn t satisfied with any of the answers presented here  since activating an environment takes a few seconds on my platform  for whatever reason   I modified my path variable so that the environment I want as default has priority over the actual default    In my case I used the following commands to accomplish that for the environment  py35    setx PATH   userprofile  Anaconda3 envs py35   PATH   setx PATH   userprofile  Anaconda3 envs py35 Scripts  PATH     to find out where your environment is stored  activate it and enter where python  I m not sure yet if this approach has any downsides  Since it also changes the default path of the conda executable  If that should be the case  please comment

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Under Linux there is an easier way to set the default environment by modifying    bashrc or    bash profile At the end you ll find something like    added by Anaconda 2 1 0 installer export PATH    anaconda bin  PATH    Replace it with     set python3 as default export PATH    anaconda envs python3 bin  PATH    and thats all there is to it

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If you just want to temporarily change to another environment  use source activate environment-name   you can create environment-name with  conda create   To change permanently  there is no method except creating a startup script that runs the above code   Typically it s best to just create new environments  However  if you really want to change the Python version in the default environment  you can do so as follows  First  make sure you have the latest version of conda by running conda update conda  Then run conda install python 3 5  This will attempt to update all your packages in your root environment to Python 3 versions  If it is not possible  e g   because some package is not built for Python 3 5   it will give you an error message indicating which package s  caused the issue  If you installed packages with pip  you ll have to reinstall them

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The correct answer  as of Dec 2018  is    you can t  Upgrading conda install python 3 6 may work  but it might not if you have packages that are necessary  but cannot be uninstalled   Anaconda uses a default environment named base and you cannot create a new  e g  python 3 6  environment with the same name  This is intentional  If you want your base Anaconda to be python 3 6  the right way to do this is to install Anaconda for python 3 6  As a package manager  the goal of Anaconda is to make different environments encapsulated  hence why you must source activate into them and why you can t just quietly switch the base package at will as this could lead to many issues on production systems

User · Answer

Change permanent  conda install python  version    Change Temporarily  View your environments  run conda info --envs on your terminal window or an Anconda Prompt  If It doesn t show environment that you want to install  run conda create -n py36 python 3 6 anaconda for python 3 6 change version as your prefer  Activating an environment  use Anaconda prompt   run activate envnme envnme you can find by this commandconda info --envs as a example when you run conda info --envs it show   base    C  Users DulangaHeshan Anaconda3  py36    C  Users DulangaHeshan Anaconda3 envs py36  then run activate py36  to check run python --version  In Windows  it is good practice to deactivate one environment before activating another  https   docs conda io projects conda en latest user-guide tasks manage-environments html highlight deactivate 20environment

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Load your  base  environment -- as OP s py34 -- when you load your terminal shell   If you use Bash  put the line   conda activate py34   in your  bash profile  or  bashrc      echo  conda activate py34   gt  gt     bash profile   Every time you run a new terminal  conda environment py34 will be loaded

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Overview Some people have multiple Anaconda environments with different versions of python for compatibility reasons   In this case  you should have a script that sets your default environment   With this method  you can preserve the versions of python you use in your environments   The following assumes environment name is the name of your environment    Mac   Linux  Edit your bash profile so that the last line is source activate environment name   In Mac OSX this is    bash profile  in other environments this may be    bashrc   Example  Here s how i did it on Mac OSX   Open Terminal and type   nano    bash profile Go to end of file and type the following  where  p3 5  is my environment   source activate p3 5 Exit File  Start a new terminal window  Type the following to see what environment is active    conda info -e   The result shows that I m using my p3 5 environment by default   For Windows  Create a command file   cmd  with activate environment name and follow these instructions to have it execute whenever you open a command prompt   Create a batch file command  e g   my conda cmd   put it in the Application Data folder  Configure it to be started automatically whenever you open cmd  This setting is in Registry  key  HKCU SOFTWARE Microsoft Command Processor value  AutoRun type  REG EXPAND SZ data    AppData  my conda cmd      from this answer  https   superuser com a 302553 143794

User · Answer

On Windows  create a batch file with the following line in it   start cmd  k  C  Anaconda3 Scripts activate bat C  Anaconda3  amp  activate env    The first path contained in quotes is the path to the activate bat file in the Anaconda installation  The path on your system might be different  The name following the activate command of course should be your desired environment name    Then run the batch file when you need to open an Anaconda prompt

[python] How to change default Anaconda python environment

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