Import Pandas throws up an error

[bonehead]

Importing Pandas on the raspberry pi, the following error crops up

`pi@raspberrypi:~/scripts $ python
 Python 3.6.1 | packaged by rpi | (default, Apr 20 2017, 19:35:19) 
 [GCC 4.9.2] on linux
 Type "help", "copyright", "credits" or "license" for more information.
 >>> import pandas
Traceback (most recent call last):
  File "/home/pi/berryconda3/lib/python3.6/site-packages/pandas/__init__.py", line 26, in <module>
from pandas._libs import (hashtable as _hashtable,
  File "/home/pi/berryconda3/lib/python3.6/site-packages/pandas/_libs/__init__.py", line 3, in <module>
    from .tslib import iNaT, NaT, Timestamp, Timedelta, OutOfBoundsDatetime
ImportError: /home/pi/berryconda3/lib/python3.6/site-packages/pandas/_libs/tslib.cpython-36m-arm-linux-gnueabihf.so: file too short
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/pi/berryconda3/lib/python3.6/site-packages/pandas/__init__.py", line 35, in <module>
    "the C extensions first.".format(module))
 ImportError: C extension: /home/pi/berryconda3/lib/python3.6/site-
 packages/pandas/_libs/tslib.cpython-36m-arm-linux-gnueabihf.so: file too short not built. If you want 
 to import pandas from the source directory, you may need to run 'python setup.py build_ext --inplace 
--force' to build the C extensions first.
>>>`

[jjhelmus]

@bonehead Can you provide more details on the environment where you are seeing this error? Specifically, what version of pandas and other packages are installed. The output of conda info and conda list should provide these details.

I was unsuccessful when I attempted to replicate this error on my machine using pandas 0.20.3-py36_0, pandas imported without error using this setup.

[bonehead]

@jjhelmus Please find attached the output

`pi@raspberrypi:/ $ conda info
Current conda install:

           platform : linux-armv7l
      conda version : 4.3.22
   conda is private : False
  conda-env version : 4.3.22
conda-build version : not installed
     python version : 3.6.1.final.0
   requests version : 2.18.1
   root environment : /home/pi/berryconda3  (writable)
default environment : /home/pi/berryconda3
   envs directories : /home/pi/berryconda3/envs
                      /home/pi/.conda/envs
      package cache : /home/pi/berryconda3/pkgs
                      /home/pi/.conda/pkgs
       channel URLs : https://conda.anaconda.org/rpi/linux-armv7l
                      https://conda.anaconda.org/rpi/noarch
        config file : /home/pi/berryconda3/.condarc
         netrc file : None
       offline mode : False
         user-agent : conda/4.3.22 requests/2.18.1 CPython/3.6.1 Linux/4.4.50-v7+ debian/8.0 glibc/2.19    
            UID:GID : 1000:1000`

 pi@raspberrypi:/ $ conda list
# packages in environment at /home/pi/berryconda3:
#
asn1crypto                0.22.0                   py36_0  
attrs                     17.2.0                    <pip>
Automat                   0.6.0                     <pip>
beautifulsoup4            4.6.0                     <pip>
bleach                    2.0.0                    py36_0  
bs4                       0.0.1                     <pip>
ca-certificates           2017.4.17                     0  
certifi                   2017.4.17                py36_0  
cffi                      1.10.0                   py36_0  
chardet                   3.0.4                    py36_0  
conda                     4.3.22                   py36_0  
conda-env                 2.6.0                         0  
constantly                15.1.0                    <pip>
cryptography              1.9                      py36_0  
decorator                 4.1.2                      py_0  
entrypoints               0.2.3                    py36_0  
html5lib                  0.999999999              py36_0  
hyperlink                 17.3.0                    <pip>
idna                      2.5                      py36_0  
incremental               17.5.0                    <pip>
ipykernel                 4.6.1                    py36_0  
ipython                   6.1.0                    py36_0  
ipython_genutils          0.2.0                      py_0  
jinja2                    2.8                      py36_0  
jsonschema                2.6.0                    py36_0  
jupyter_client            5.1.0                    py36_0  
jupyter_core              4.3.0                    py36_0  
libffi                    3.2.1                         0  
libgfortran               3.0.0                         0  
libsodium                 1.0.10                        0  
markupsafe                0.23                     py36_0  
mistune                   0.7.4                      py_0  
nbconvert                 5.2.1                      py_0  
nbformat                  4.3.0                    py36_0  
ncurses                   5.9                           0  
notebook                  5.0.0                      py_0  
numpy                     1.13.1                   py36_0  
openblas                  0.2.19                        0  
openssl                   1.0.2l                        0  
packaging                 16.8                     py36_0  
pandas                    0.20.3                   py36_0  
pandocfilters             1.4.2                      py_0  
pexpect                   4.2.1                    py36_0  
pickleshare               0.7.4                    py36_0  
pip                       9.0.1                    py36_0  
prompt_toolkit            1.0.15                     py_0  
ptyprocess                0.5.2                      py_0  
pycosat                   0.6.1                    py36_0  
pycparser                 2.17                     py36_0  
pygments                  2.1.3                    py36_0  
pyopenssl                 16.2.0                   py36_0  
pyparsing                 2.2.0                    py36_0  
python                    3.6.1                         0  
python-dateutil           2.6.1                      py_0  
pytz                      2017.2                     py_0  
pyzmq                     16.0.2                   py36_0  
readline                  6.3                           0  
requests                  2.18.1                   py36_0  
ruamel_yaml               0.11.14                  py36_0  
setuptools                36.0.1                   py36_0 
simplegeneric             0.8.1                    py36_0  
six                       1.10.0                   py36_0  
sqlite                    3.15.0                        0  
terminado                 0.6                      py36_0  
testpath                  0.3.1                    py36_0  
tk                        8.6.6                         0  
tornado                   4.5.1                    py36_0  
traitlets                 4.3.2                    py36_0  
Twisted                   17.5.0                    <pip>
urllib3                   1.21.1                   py36_0  
wcwidth                   0.1.7                    py36_0  
webencodings              0.5.1                      py_0  
wheel                     0.29.0                   py36_0  
xz                        5.2.2                         0  
yaml                      0.1.6                         0  
zeromq                    4.1.6                         0  
zlib                      1.2.11                        0  
zope.interface            4.4.2                     <pip> 

[jjhelmus]

I'm not seeing anything obvious that would be causing an issue. Mixing pip and conda can cause some problems but in this case it does not seem to be the cause. It's possible that tslib.cpython-36m-arm-linux-gpuabihf.so file was corrupted or truncated at some point. Can you check the size of the file using ls -l /home/pi/berryconda3/lib/python3.6/site- packages/pandas/_libs/tslib.cpython-36m-arm-linux-gnueabihf.so. It should be 7001272, it is it not then something is amiss.

Removing and reinstalling pandas may fix the issue, conda remove pandas followed by conda install pandas should do the trick.

[bonehead]

I purged Berryconda and reinstalled and it did the trick, Pandas reinstalls fine.