CODEWITHSUNDEEP
pythonpython-2.7anaconda
Christoph
Christoph

Reputation: 5612

How do I get Anaconda3 to see Python 2.7 after installing it?

So, I set up Anaconda(3) on my Windows 8 computer, it worked without problems. Now, I also need an installation of Python 2, so I created an appropriate additional environment. Sadly, after activating that environment, the python interpreter it sees stays the same. What am I doing wrong? (Shortened) console output:

C:\Users\me\AppData\Local\Continuum\Anaconda3>conda create -n py27 python=2.7 anaconda
Fetching package metadata: ..
Solving package specifications: .
Package plan for installation in environment C:\Users\me\AppData\Local\Continuum\Anaconda3\envs\py27:

<snip>
The following NEW packages will be INSTALLED:

    _license:           1.1-py27_0
    anaconda:           2.1.0-np19py27_0
<snip>
    python:             2.7.8-0
<snip>
Proceed ([y]/n)? y

menuinst-1.0.4 100% |###############################| Time: 0:00:00 239.25 kB/s
Fetching packages ...
_license-1.1-p 100% |###############################| Time: 0:00:00 432.62 kB/s
anaconda-2.1.0 100% |###############################| Time: 0:00:00 150.62 kB/s
<snip>
Extracting packages ...
[      COMPLETE      ] |#################################################| 100%
Linking packages ...
[      COMPLETE      ] |#################################################| 100%
#
# To activate this environment, use:
# > activate py27
#

C:\Users\me\AppData\Local\Continuum\Anaconda3>python --version
Python 3.4.1 :: Anaconda 2.1.0 (64-bit)

C:\Users\me\AppData\Local\Continuum\Anaconda3>activate py27
Activating environment "py27"...

[py27] C:\Users\me\AppData\Local\Continuum\Anaconda3>python --version
Python 3.4.1 :: Anaconda 2.1.0 (64-bit)
<why isn't python 2.7.8 visible here??>

Doing echo %PATH% before and after activation gives this output

C:\Users\me\AppData\Local\Continuum\Anaconda3>echo %PATH%
C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows
\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Fi
les (x86)\PDFtk\bin\;C:\Users\me\AppData\Local\Continuum\Anaconda3;C:\Users\me\AppData\Local\Continuum\Anaconda3\Scripts

C:\Users\me\AppData\Local\Continuum\Anaconda3>python --version
Python 3.4.1 :: Anaconda 2.1.0 (64-bit)

C:\Users\me\AppData\Local\Continuum\Anaconda3>activate py27
Activating environment "py27"...

[py27] C:\Users\me\AppData\Local\Continuum\Anaconda3>echo %PATH%
C:\Users\me\AppData\Local\Continuum\Anaconda3\envs\py27;C:\Users\me\AppData\Local\Continuum\Anaconda3\envs\py27\Scripts;C:
\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\S
ystem32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program File
s (x86)\PDFtk\bin\;C:\Users\me\AppData\Local\Continuum\Anaconda3;C:\Users\me\AppData\Local\Continuum\Anaconda3\Scripts

[py27] C:\Users\me\AppData\Local\Continuum\Anaconda3>python --version
Python 3.4.1 :: Anaconda 2.1.0 (64-bit)

This looks correct. Additionally, the python.exe in \envs\py27\python.exe is a 2.7.8 Python!

Upvotes: 3

Views: 4353

Answers (1)

filmor
filmor

Reputation: 32298

On Windows the current path takes precedence over the PATH variable when accessing binaries. Thus, since you are still in the Anaconda3 directory containing python.exe, cmd will choose that one instead of looking it up via the PATH which would have returned the Python 2.7 executable. cd to a different path and you are fine.

Upvotes: 3

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