Christopher Juckins

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Python Notes

11 December 2019

Upgraded Chrome via yum to version 79.0.3945.79 and now fails.

Did the following as root to fix:

# /usr/local/bin/pip3 uninstall chromedriver-binary
# /usr/local/bin/pip3 install chromedriver-binary
# /usr/local/bin/pip3 install pip-upgrade-outdated
# pip-upgrade-outdated

# find /usr -name "chromedriver"

# chmod 755 /usr/local/lib/python3.6/site-packages/chromedriver_binary/chromedriver

Note that both /usr/bin/pip3.6 and /usr/local/bin/pip3.6 exist on the system now…needs to be fixed.

With CentOS7.7, python3 can load from base. Do the following to fix previously-installed IUS release:

# yum remove python36u
# yum install python3
# yum remove ius-release
  • Then follow instructions for installing local python packages to ensure all still work.
  • If you have pip problems, uninstall/reinstall using instructions at
  • Ensure pip3.6 is in your $PATH or you have a sym link to it (/usr/local/bin) in /usr/bin

Install Python 3.6 on CentOS 7:

Do some local configuration for my scripts (su - root):

pip3.6 install --upgrade pip
pip3.6 install --upgrade httplib2
pip3.6 install pymysql
pip3.6 install selenium-wire
pip3.6 install chromedriver
pip3.6 install chromedriver_binary
pip3.6 install dictor
pip3.6 install wget
pip3.6 install pip-upgrade-outdated

To update all pip packages:

# pip_upgrade_outdated

Note that is a good resource to update all PIP packages.

Download and install geckodriver (see

As root, copy geckodriver to /usr/local/bin and ensure permissions are 755

Notes at

Notes about Python database access

Python3.7 on Fedora 28:

Use “pip” to manage python packages:

# yum install python2-pip

To list installed python modules:

$ pip list

Logging in python

logging.basicConfig(format='%(asctime)s %(message)s', filename=log_file, level=logging.DEBUG)
logging.debug('This message should go to the log file')'So should this')
logging.warning('And this, too')

Write beautiful python code with PEP-8

python_notes.txt · Last modified: 2019/12/11 13:48 by juckins