Question: I am having python 3.6.8 on oracle Linux EL7 I installed pip3 using yum install python36-pip  however, when ever I invoke pip3 it is having library error pip3 Traceback (most recent call last): File "/bin/pip3", line 8, in <module> from pip import main File "/usr/lib/python3.6/site-packages/pip/__init__.py", line 42, in <module> from pip.utils import get_installed_distributions, get_prog File "/usr/lib/python3.6/site-packages/pip/utils/__init__.py", line 27, in <module> from pip._vendor import pkg_resources File "/usr/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 35, in <module> import plistlib File "/usr/lib64/python3.6/plistlib.py", line 65, in <module> from xml.parsers.expat import ParserCreate File "/usr/lib64/python3.6/xml/parsers/expat.py", line 4, in <module> from pyexpat import * ImportError: /usr/lib64/python3.6/lib-dynload/pyexpat.cpython-36m-x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt During handling of the above exception, another exception occurred: Traceback (most recent call last): File "/bin/pip3", line 12, in <module> from pip._internal import main File "/usr/lib/python3.6/site-packages/pip/__init__.py", line 42, in <module> from pip.utils import get_installed_distributions, get_prog File "/usr/lib/python3.6/site-packages/pip/utils/__init__.py", line 27, in <module> from pip._vendor import pkg_resources File "/usr/lib/python3.6/site-packages/pip/_vendor/pkg_resources/__init__.py", line 35, in <module> import plistlib File "/usr/lib64/python3.6/plistlib.py", line 65, in <module> from xml.parsers.expat import ParserCreate File "/usr/lib64/python3.6/xml/parsers/expat.py", line 4, in <module> from pyexpat import * ImportError: /usr/lib64/python3.6/lib-dynload/pyexpat.cpython-36m-x86_64-linux-gnu.so: undefined symbol: XML_SetHashSalt  I tried to see if there is any alternative to pyexpat.*.so but it seems there is none did ldd on the last line below is the out put [root@whf00jkd python3.6]# ldd /usr/lib64/python3.6/lib-dynload/pyexpat.cpython-36m-x86_64-linux-gnu.so linux-vdso.so.1 => (0x00007ffd76bf9000) libexpat.so.1 => /scratch/oraofss/app/oraofss/product/18.0.0/client_1/lib/libexpat.so.1 (0x00007fec3a94a000) libpython3.6m.so.1.0 => /lib64/libpython3.6m.so.1.0 (0x00007fec3a422000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fec3a206000) libc.so.6 => /lib64/libc.so.6 (0x00007fec39e38000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fec39c34000) libutil.so.1 => /lib64/libutil.so.1 (0x00007fec39a31000) libm.so.6 => /lib64/libm.so.6 (0x00007fec3972f000) /lib64/ld-linux-x86-64.so.2 (0x00007fec3ad81000)  I did a search for libexpat.so.1 [root@whf00jkd python3.6]# whereis libexpat.so.1 libexpat.so: /usr/lib/libexpat.so.1 /usr/lib/libexpat.so /usr/lib64/libexpat.so.1 /usr/lib64/libexpat.so [root@whf00jkd python3.6]# ls -ltr /usr/lib/libexpat.so.1 lrwxrwxrwx. 1 root root 17 Apr 1 2019 /usr/lib/libexpat.so.1 -> libexpat.so.1.6.0 [root@whf00jkd python3.6]# ls -ltr /usr/lib64/libexpat.so.1 lrwxrwxrwx. 1 root root 17 Apr 1 2019 /usr/lib64/libexpat.so.1 -> libexpat.so.1.6.0  and added a link libexpat.so.1 -> /usr/lib/libexpat.so.1 in /usr/lib64/python3.6/lib-dynload/ but that is not removing the error Please help

Answer: libexpat.so.1 pointing to wrong location. Fixed it with export LD_LIBRARY_PATH=/lib64/:${LD_LIBRARY_PATH}  ldd /usr/lib64/python3.6/lib-dynload/pyexpat.cpython-36m-x86_64-linux-gnu.so linux-vdso.so.1 => (0x00007fff073f1000) libexpat.so.1 => /lib64/libexpat.so.1 (0x00007f9ba53ce000) libpython3.6m.so.1.0 => /lib64/libpython3.6m.so.1.0 (0x00007f9ba4ea9000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f9ba4c8d000) libc.so.6 => /lib64/libc.so.6 (0x00007f9ba48bf000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f9ba46bb000) libutil.so.1 => /lib64/libutil.so.1 (0x00007f9ba44b8000) libm.so.6 => /lib64/libm.so.6 (0x00007f9ba41b6000) /lib64/ld-linux-x86-64.so.2 (0x00007f9ba5807000)