Hi Igor,
     Thanks for your reminding. I created a new environment and installed 
Pyarrow from conda-forge. Indeed the version 0.15 is installed automatically in 
the new enviroment. The import is all right. 

Best regards
Xiaoni

> Le 9 janv. 2020 à 22:22, Igor Yastrebov <[email protected]> a écrit :
> 
> Hi Xiaoni,
> 
> I strongly advise against doing it this way. If `conda install -c conda-forge 
> pyarrow` installs pyarrow 0.11.1 in your environment then it means there is a 
> conflict between versions of packages and you will likely encounter problems 
> later on.
> 
> I advise the following:
> 1) Remove anaconda
> 2) Install miniconda instead
> 3) Install only the packages you need (preferably in a new environment)
> 4) Do `conda install -c conda-forge pyarrow=0.15.1`
> 5) Success! If problems remain, resolve conflicts manually
> 
> Best regards,
> Igor
> 
> пт, 10 янв. 2020 г., 0:08 Xiaoni Wang <[email protected] 
> <mailto:[email protected]>>:
> Dear all,
>      Thanks for your input. This problem is now resolved.
> 
> 1) removed older version of anaconda
> 2) reinstall anaconda3.7 and other packages
> 3) pip install pyarrow==0.15.*
> 
> The import of pyarrow is good now. 
> 
> Before, I used 'condo install -c conda-forge pyarrow’, and Conda installed an 
> older version 0.11.1 automatically, not the latest 0.15. It seems to me that 
> the older version of pyarrow may result in the conflicts with other packages.
> 
> Best regards
> Xiaoni
> 
> Le 9 janv. 2020 à 15:40, xxwang <[email protected] 
> <mailto:[email protected]>> a écrit :
> 
>> Hi Wes
>>      Thanks. There seems to be a version conflict problem. I have the 
>> condo-forge in my channel list. I had installed Pyarrow by 'conda install 
>> pyarrow’.
>> What I did just now:
>> 1) I removed Pyarrow by : conda uninstall pyarrow
>> 2) Then I tried to reinstall Pyarrow by: conda install pyarrow
>> The conda suggested to install Pyarrow-0.11.1. So I installed it. Then I got 
>> the same error of 'undefined symbol'.
>> 
>> Thanks in advance,
>> 
>> Xiaoni
>> 
>> 
>> conda list give:
>> # packages in environment at /obs/xxwang/anaconda3:
>> #
>> # Name                    Version                   Build  Channel
>> _ipyw_jlab_nb_ext_conf    0.1.0                    py37_0  
>> _libgcc_mutex             0.1                        main  
>> _tflow_select             2.3.0                       mkl  
>> absl-py                   0.8.1                    py37_0  
>> alabaster                 0.7.12                   py37_0  
>> anaconda                  2019.10                  py37_0  
>> anaconda-client           1.7.2                    py37_0  
>> anaconda-navigator        1.9.7                    py37_0  
>> anaconda-project          0.8.3                      py_0  
>> aplus                     0.11.0                     py_1    conda-forge
>> arrow-cpp                 0.11.1           py37h3bd774a_1    conda-forge
>> asn1crypto                1.0.1                    py37_0  
>> astor                     0.8.0                    py37_0  
>> astroid                   2.3.1                    py37_0  
>> astropy                   3.2.2            py37h7b6447c_0  
>> atomicwrites              1.3.0                    py37_1  
>> attrs                     19.2.0                     py_0  
>> babel                     2.7.0                      py_0  
>> backcall                  0.1.0                    py37_0  
>> backports                 1.0                        py_2  
>> backports.functools_lru_cache 1.6.1                      py_0  
>> backports.os              0.1.1                    py37_0  
>> backports.shutil_get_terminal_size 1.0.0                    py37_2  
>> backports.tempfile        1.0                        py_1  
>> backports.weakref         1.0.post1                  py_1  
>> beautifulsoup4            4.8.0                    py37_0  
>> binutils_impl_linux-64    2.33.1               he6710b0_7  
>> binutils_linux-64         2.33.1              h9595d00_15  
>> bitarray                  1.0.1            py37h7b6447c_0  
>> bkcharts                  0.2                      py37_0  
>> blas                      1.0                         mkl  
>> bleach                    3.1.0                    py37_0  
>> blosc                     1.16.3               hd408876_0  
>> bokeh                     1.3.4                    py37_0  
>> boost-cpp                 1.68.0            h11c811c_1000    conda-forge
>> boto                      2.49.0                   py37_0  
>> boto3                     1.10.39                    py_0  
>> botocore                  1.13.39                    py_0  
>> bottleneck                1.2.1            py37h035aef0_1  
>> bqplot                    0.12.2                     py_0    conda-forge
>> branca                    0.3.1                      py_0    conda-forge
>> bzip2                     1.0.8                h7b6447c_0  
>> c-ares                    1.15.0            h7b6447c_1001  
>> ca-certificates           2019.8.28                     0  
>> cachetools                3.1.1                      py_0    conda-forge
>> cairo                     1.14.12              h8948797_3  
>> certifi                   2019.9.11                py37_0  
>> cffi                      1.12.3           py37h2e261b9_0  
>> cftime                    1.0.4.2          py37hdd07704_0  
>> chardet                   3.0.4                 py37_1003  
>> click                     7.0                      py37_0  
>> cloudpickle               1.2.2                      py_0  
>> clyent                    1.2.2                    py37_1  
>> colorama                  0.4.1                    py37_0  
>> conda                     4.7.12                   py37_0  
>> conda-build               3.18.9                   py37_3  
>> conda-env                 2.6.0                         1  
>> conda-package-handling    1.6.0            py37h7b6447c_0  
>> conda-verify              3.4.2                      py_1  
>> contextlib2               0.6.0                      py_0  
>> cryptography              2.7              py37h1ba5d50_0  
>> curl                      7.65.3               hbc83047_0  
>> cycler                    0.10.0                   py37_0  
>> cython                    0.29.13          py37he6710b0_0  
>> cytoolz                   0.10.0           py37h7b6447c_0  
>> dask                      2.5.2                      py_0  
>> dask-core                 2.5.2                      py_0  
>> dbus                      1.13.6               h746ee38_0  
>> decorator                 4.4.0                    py37_1  
>> defusedxml                0.6.0                      py_0  
>> distributed               2.5.2                      py_0  
>> docutils                  0.15.2                   py37_0  
>> entrypoints               0.3                      py37_0  
>> et_xmlfile                1.0.1                    py37_0  
>> expat                     2.2.6                he6710b0_0  
>> fastcache                 1.1.0            py37h7b6447c_0  
>> filelock                  3.0.12                     py_0  
>> flask                     1.1.1                      py_0  
>> fontconfig                2.13.0               h9420a91_0  
>> freetype                  2.9.1                h8a8886c_1  
>> fribidi                   1.0.5                h7b6447c_0  
>> fsspec                    0.5.2                      py_0  
>> future                    0.18.2                   py37_0  
>> gast                      0.2.2                    py37_0  
>> gcc_impl_linux-64         7.3.0                habb00fd_1  
>> gcc_linux-64              7.3.0               h553295d_15  
>> get_terminal_size         1.0.0                haa9412d_0  
>> gevent                    1.4.0            py37h7b6447c_0  
>> git                       2.23.0          pl526hacde149_0  
>> glib                      2.56.2               hd408876_0  
>> glob2                     0.7                        py_0  
>> gmp                       6.1.2                h6c8ec71_1  
>> gmpy2                     2.0.8            py37h10f8cd9_2  
>> google-pasta              0.1.8                      py_0  
>> graphite2                 1.3.13               h23475e2_0  
>> greenlet                  0.4.15           py37h7b6447c_0  
>> grpcio                    1.16.1           py37hf8bcb03_1  
>> gst-plugins-base          1.14.0               hbbd80ab_1  
>> gstreamer                 1.14.0               hb453b48_1  
>> gxx_impl_linux-64         7.3.0                hdf63c60_1  
>> gxx_linux-64              7.3.0               h553295d_15  
>> h5py                      2.9.0            py37h7918eee_0  
>> harfbuzz                  1.8.8                hffaf4a1_0  
>> hdf4                      4.2.13               h3ca952b_2  
>> hdf5                      1.10.4               hb1b8bf9_0  
>> heapdict                  1.0.1                      py_0  
>> html5lib                  1.0.1                    py37_0  
>> icu                       58.2                 h9c2bf20_1  
>> idna                      2.8                      py37_0  
>> imageio                   2.6.0                    py37_0  
>> imagesize                 1.1.0                    py37_0  
>> importlib_metadata        0.23                     py37_0  
>> intel-openmp              2019.4                      243  
>> ipydatawidgets            4.0.1                      py_0    conda-forge
>> ipykernel                 5.1.2            py37h39e3cac_0  
>> ipyleaflet                0.11.6                   py37_0    conda-forge
>> ipympl                    0.3.3                      py_0  
>> ipyscales                 0.3.0                      py_0    conda-forge
>> ipython                   7.8.0            py37h39e3cac_0  
>> ipython_genutils          0.2.0                    py37_0  
>> ipyvolume                 0.5.2                    py37_0    conda-forge
>> ipyvue                    1.0.2                      py_0    conda-forge
>> ipyvuetify                1.1.1                      py_0    conda-forge
>> ipywebrtc                 0.5.0                    py37_0    conda-forge
>> ipywidgets                7.5.1                      py_0  
>> isort                     4.3.21                   py37_0  
>> itsdangerous              1.1.0                    py37_0  
>> jbig                      2.1                  hdba287a_0  
>> jdcal                     1.4.1                      py_0  
>> jedi                      0.15.1                   py37_0  
>> jeepney                   0.4.1                      py_0  
>> jinja2                    2.10.3                     py_0  
>> jmespath                  0.9.4                      py_0  
>> joblib                    0.13.2                   py37_0  
>> jpeg                      9b                   h024ee3a_2  
>> json5                     0.8.5                      py_0  
>> jsonschema                3.0.2                    py37_0  
>> jupyter                   1.0.0                    py37_7  
>> jupyter_client            5.3.3                    py37_1  
>> jupyter_console           6.0.0                    py37_0  
>> jupyter_core              4.5.0                      py_0  
>> jupyterlab                1.1.4              pyhf63ae98_0  
>> jupyterlab_server         1.0.6                      py_0  
>> keras                     2.3.1                    py37_0    conda-forge
>> keras-applications        1.0.8                      py_0  
>> keras-preprocessing       1.1.0                      py_1  
>> keyring                   18.0.0                   py37_0  
>> kiwisolver                1.1.0            py37he6710b0_0  
>> krb5                      1.16.1               h173b8e3_7  
>> lazy-object-proxy         1.4.2            py37h7b6447c_0  
>> ld_impl_linux-64          2.33.1               h53a641e_7  
>> libarchive                3.3.3                h5d8350f_5  
>> libcurl                   7.65.3               h20c2e04_0  
>> libedit                   3.1.20181209         hc058e9b_0  
>> libevent                  2.1.8                h1ba5d50_0  
>> libffi                    3.2.1                hd88cf55_4  
>> libgcc-ng                 9.1.0                hdf63c60_0  
>> libgfortran-ng            7.3.0                hdf63c60_0  
>> libgpuarray               0.7.6                h14c3975_0  
>> liblief                   0.9.0                h7725739_2  
>> libnetcdf                 4.6.1                h11d0813_2  
>> libpng                    1.6.37               hbc83047_0  
>> libprotobuf               3.11.2               hd408876_0  
>> libsodium                 1.0.16               h1bed415_0  
>> libssh2                   1.8.2                h1ba5d50_0  
>> libstdcxx-ng              9.1.0                hdf63c60_0  
>> libtiff                   4.0.10               h2733197_2  
>> libtool                   2.4.6                h7b6447c_5  
>> libuuid                   1.0.3                h1bed415_2  
>> libxcb                    1.13                 h1bed415_1  
>> libxml2                   2.9.9                hea5a465_1  
>> libxslt                   1.1.33               h7d1a2b0_0  
>> llvmlite                  0.29.0           py37hd408876_0  
>> locket                    0.2.0                    py37_1  
>> lxml                      4.4.1            py37hefd8a0e_0  
>> lz4-c                     1.8.1.2              h14c3975_0  
>> lzo                       2.10                 h49e0be7_2  
>> mako                      1.1.0                      py_0  
>> markdown                  3.1.1                    py37_0  
>> markupsafe                1.1.1            py37h7b6447c_0  
>> matplotlib                3.1.1            py37h5429711_0  
>> mccabe                    0.6.1                    py37_1  
>> mistune                   0.8.4            py37h7b6447c_0  
>> mkl                       2019.4                      243  
>> mkl-service               2.3.0            py37he904b0f_0  
>> mkl_fft                   1.0.14           py37ha843d7b_0  
>> mkl_random                1.1.0            py37hd6b4f25_0  
>> mock                      3.0.5                    py37_0  
>> more-itertools            7.2.0                    py37_0  
>> mpc                       1.1.0                h10f8cd9_1  
>> mpfr                      4.0.1                hdf1c602_3  
>> mpmath                    1.1.0                    py37_0  
>> msgpack-python            0.6.1            py37hfd86e86_1  
>> multipledispatch          0.6.0                    py37_0  
>> navigator-updater         0.2.1                    py37_0  
>> nbconvert                 5.6.0                    py37_1  
>> nbformat                  4.4.0                    py37_0  
>> ncurses                   6.1                  he6710b0_1  
>> netcdf4                   1.4.2            py37h808af73_0  
>> networkx                  2.3                        py_0  
>> nltk                      3.4.5                    py37_0  
>> nose                      1.3.7                    py37_2  
>> notebook                  6.0.1                    py37_0  
>> numba                     0.45.1           py37h962f231_0  
>> numexpr                   2.7.0            py37h9e4a6bb_0  
>> numpy                     1.17.2           py37haad9e8e_0  
>> numpy-base                1.17.2           py37hde5b4d6_0  
>> numpydoc                  0.9.1                      py_0  
>> olefile                   0.46                     py37_0  
>> openpyxl                  3.0.0                      py_0  
>> openssl                   1.1.1d               h7b6447c_2  
>> opt_einsum                3.1.0                      py_0  
>> packaging                 19.2                       py_0  
>> pandas                    0.25.1           py37he6710b0_0  
>> pandoc                    2.2.3.2                       0  
>> pandocfilters             1.4.2                    py37_1  
>> pango                     1.42.4               h049681c_0  
>> parquet-cpp               1.5.1                         3    conda-forge
>> parso                     0.5.1                      py_0  
>> partd                     1.0.0                      py_0  
>> patchelf                  0.9                  he6710b0_3  
>> path.py                   12.0.1                     py_0  
>> pathlib2                  2.3.5                    py37_0  
>> patsy                     0.5.1                    py37_0  
>> pcre                      8.43                 he6710b0_0  
>> pep8                      1.7.1                    py37_0  
>> perl                      5.26.2               h14c3975_0  
>> pexpect                   4.7.0                    py37_0  
>> pickleshare               0.7.5                    py37_0  
>> pillow                    6.2.0            py37h34e0f95_0  
>> pip                       19.2.3                   py37_0  
>> pixman                    0.38.0               h7b6447c_0  
>> pkginfo                   1.5.0.1                  py37_0  
>> pluggy                    0.13.0                   py37_0  
>> ply                       3.11                     py37_0  
>> progressbar2              3.37.1                   py37_0  
>> prometheus_client         0.7.1                      py_0  
>> prompt_toolkit            2.0.10                     py_0  
>> protobuf                  3.11.2           py37he6710b0_0  
>> psutil                    5.6.3            py37h7b6447c_0  
>> ptyprocess                0.6.0                    py37_0  
>> py                        1.8.0                    py37_0  
>> py-lief                   0.9.0            py37h7725739_2  
>> pyarrow                   0.11.1          py37hbbcf98d_1002    conda-forge
>> pycodestyle               2.5.0                    py37_0  
>> pycosat                   0.6.3            py37h14c3975_0  
>> pycparser                 2.19                     py37_0  
>> pycrypto                  2.6.1            py37h14c3975_9  
>> pycurl                    7.43.0.3         py37h1ba5d50_0  
>> pyflakes                  2.1.1                    py37_0  
>> pygments                  2.4.2                      py_0  
>> pygpu                     0.7.6            py37h035aef0_0  
>> pylint                    2.4.2                    py37_0  
>> pyodbc                    4.0.27           py37he6710b0_0  
>> pyopenssl                 19.0.0                   py37_0  
>> pyparsing                 2.4.2                      py_0  
>> pyqt                      5.9.2            py37h05f1152_2  
>> pyrsistent                0.15.4           py37h7b6447c_0  
>> pysocks                   1.7.1                    py37_0  
>> pytables                  3.5.2            py37h71ec239_1  
>> pytest                    5.2.1                    py37_0  
>> pytest-arraydiff          0.3              py37h39e3cac_0  
>> pytest-astropy            0.5.0                    py37_0  
>> pytest-doctestplus        0.4.0                      py_0  
>> pytest-openfiles&n

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