How to uninstall the obsolete version of pytest that pylint comes with

obsolete_pytest.txt

# Are we in a virtual environment?  We can't return values from bash functions.
# Instead, in the calling function, use command substitution to get the result.
# For example:
#    MY_VAR=$(in_virtualenv)
function in_virtualenv
{
    python -c 'import sys; print(sys.real_prefix)' > /dev/null 2>&1 && INVENV=1 || INVENV=0
    echo "$INVENV"
}

# Remove obsolete "pytest" script, that comes with pylint
function remove_obsolete_pytest
{
    INVENV=$(in_virtualenv)
    if [[ $INVENV -eq 0 ]]; then
        echo "Not in a virtual environment"
    else
        PYTEST_PATH=$VIRTUAL_ENV/bin/pytest
        # Remove the obsolete `pytest` script that pylint installs.
        if [[ -a $PYTEST_PATH ]]; then
            rm $PYTEST_PATH
            echo "Removed obsolete pytest script"
        else
            echo "Obsolete pytest script not found"
        fi
        echo $PYTEST_PATH
    fi
}