ImportError: No module named _internal.cli.main

what output do you get for the following commands

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pip -V
pip2 -V
pip3 -V

and

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which pip
which pip2
which pip3

and for

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pip install --upgrade pip
pip2 install --upgrade pip
pip3 install --upgrade pip

 

and output for

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yum versionlock list

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yum -q list python2-pip --showduplicates --disableplugin=versionlock | tr -s ' ' | column -t

example

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yum -q list python2-pip --showduplicates --disableplugin=versionlock | tr -s ' ' | column -t 
Installed           Packages
python2-pip.noarch  8.1.2-10.el7  @epel

 

also output for

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pip list
pip2 list
pip3 list

and

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yum -q provides /usr/bin/pip