ValueError: failed to parse CPython sys.version after using conda command

Question

I'm running into an error that I can't solve despite others having reported the same error.

I am connecting remotely to a Linux machine. I have installed the latest version of anaconda:

$ bash Anaconda2-2.4.0-Linux-x86_64.sh

// A lot of python libraries get installed

installing: _cache-0.0-py27_x0 ...
Python 2.7.10 :: Continuum Analytics, Inc.
creating default environment...
installation finished. 

I updated the corresponding paths and it seems like it works:

$ python
Python 2.7.10 |Anaconda 2.4.0 (64-bit)| (default, Oct 19 2015, 18:04:42) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Anaconda is brought to you by Continuum Analytics.
Please check out: http://continuum.io/thanks and https://anaconda.org

Great, so now I want to use conda, which is pre-installed with Anaconda. It looks like Anaconda gave me 3.18.3:

$ conda --version
conda 3.18.3

Following the test drive instructions, I update conda:

$ conda update conda
Fetching package metadata: An unexpected error has occurred, please consider sending the
following traceback to the conda GitHub issue tracker at:

    https://github.com/conda/conda/issues

Include the output of the command 'conda info' in your report.


Traceback (most recent call last):
  File "/code/anaconda2-4-0/bin/conda", line 5, in <module>
    sys.exit(main())
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/cli/main.py", line 195, in main
    args_func(args, p)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/cli/main.py", line 202, in args_func
    args.func(args, p)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/cli/main_update.py", line 48, in execute
    install.install(args, parser, 'update')
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/cli/install.py", line 239, in install
    offline=args.offline)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/cli/common.py", line 598, in get_index_trap
    return get_index(*args, **kwargs)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/api.py", line 42, in get_index
    unknown=unknown)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/utils.py", line 119, in __call__
    value = self.func(*args, **kw)
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/fetch.py", line 237, in fetch_index
    session = CondaSession()
  File "/code/anaconda2-4-0/lib/python2.7/site-packages/conda/connection.py", line 61, in __init__
    super(CondaSession, self).__init__(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 272, in __init__
    self.headers = default_headers()
  File "/usr/lib/python2.7/dist-packages/requests/utils.py", line 555, in default_headers
    'User-Agent': default_user_agent(),
  File "/usr/lib/python2.7/dist-packages/requests/utils.py", line 524, in default_user_agent
    _implementation = platform.python_implementation()
  File "/usr/lib/python2.7/platform.py", line 1521, in python_implementation
    return _sys_version()[0]
  File "/usr/lib/python2.7/platform.py", line 1486, in _sys_version
    repr(sys_version))
ValueError: failed to parse CPython sys.version: '2.7.10 |Anaconda 2.4.0 (64-bit)| (default, Oct 19 2015, 18:04:42) \n[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)]'

Unfortunately, I can't figure out how to avoid this error.

I found a few other StackOverflow posts. This one suggests reinstalling python and pycharm from scratch (but I just installed Anaconda and I don't use pycharm). Another suggests reinstalling canopy, but I'm not using that here. Finally, a third suggests that it's actually a bug, and proposes a fix. Unfortunately, re-naming sys.version fails to resolve the error. This isn't even my computer so I don't want to get deep into the code and risk messing something up.

I would appreciate some thoughts or advice.

Answer 1

I found another solution for this issue. I was getting the same issue while opening the Spyder on MAC. Here is the solution which worked for me.

• First remove the existing Spyder from the system using conda remove spyder

• Then clone its GitHub repository and run the setup:

git clone https://github.com/spyder-ide/spyder.git

cd spyder

python bootstrap.py

This will open the Spyder instance.

Answer 2

I had this error (ValueError: failed to parse CPython sys.version) when trying to open Spyder after installing FiPy using the following line from the FiPy website:

conda create --name <MYFIPYENV> --channel guyer --channel conda-forge fipy nomkl 

The error originates from a package called zmq:

File "/Users/user/anaconda3/lib/python3.6/site-packages/spyder/utils/introspection/plugin_client.py", line 18, in
import zmq
File "/Users/user/anaconda3/lib/python3.6/site-packages/zmq/init.py", line 34, in
from zmq import backend
File "/Users/user/anaconda3/lib/python3.6/site-packages/zmq/backend/init.py", line 21, in
if platform.python_implementation() == 'PyPy':
File "/Users/user/anaconda3/lib/python3.6/platform.py", line 1234, in python_implementation
return _sys_version()[0]
File "/Users/user/anaconda3/lib/python3.6/platform.py", line 1192, in _sys_version
repr(sys_version))

Running the following line of code in Terminal resolved it (from a Spyder maintainer on GitHub):

conda update --name <MYFIPYENV> python pyzmq python.app

Answer 3

Just install proper version of python. For me it worked when i installed Python 3.6.5. Use this command

• conda install Python=3.6.5

after finishing the installation Run spyder again.

Answer 4

I had the same issue under Linux after a system upgrade. I managed to get ride of this message ("failed to parse CPython sys.version") by deleting the ~/.local directory. Can be useful maybe...

Answer 5

Just had the same issue on Windows, fixed it by changing the PythonPath to the Anaconda installation (I had a previous installation of Python).

Answer 6

Third solution is correct. This is indeed a bug, since modified sys.version string breaks a number of platform module functions that rely on that string having certain format.

However, if you cannot fix it properly, you can attempt a hacky workaround. Module platform actually has a cache for parsing sys.version string: so what you have to do is:

1. Backup Anaconda-modified sys.version.
2. Replace it with a legal version string.
3. Make a call to any platform module function that unparses sys.version string.
4. Duplicate it's cache for Anaconda-modified sys.version as well.
5. Restore sys.version from backup.

Hack itself:

try:
    import sys # Just in case
    start = sys.version.index('|') # Do we have a modified sys.version?
    end = sys.version.index('|', start + 1)
    version_bak = sys.version # Backup modified sys.version
    sys.version = sys.version.replace(sys.version[start:end+1], '') # Make it legible for platform module
    import platform
    platform.python_implementation() # Ignore result, we just need cache populated
    platform._sys_version_cache[version_bak] = platform._sys_version_cache[sys.version] # Duplicate cache
    sys.version = version_bak # Restore modified version string
except ValueError: # Catch .index() method not finding a pipe
    pass

You need to put this code somewhere where it will be executed before conda has a chance to fail with exception. Not sure what the best place would be, but you could try it with conda/cli/main.py, conda/api.py or conda/connection.py.