Python
Installation on Ubuntu
Virtual environments are great. Best to use them right out of the gate, as Ubuntu apparently has hacked up their version.
sudo apt update sudo apt install virtualenv virtualenv my_python source my_pyton/bin/activate pip install --upgrade pip
Here are the things I had to install to get my work env going:
sudo apt install python-pip libxml2-dev libxslt1-dev
And that never got me there. More lessons to learn...
Configure pycharm to use a virtualenv
File > Settings > Project: ate > Project Interpreter > click Gear in top-right > Add Local
Select the python bin eg:
/home/m/Envs/ate/bin/python2
Dependency Control
Great suggestion for python dependency control:
use two dependency files, one general, and one for current freeze version numbers node.js has a similar approach with its new lock files (good stuff i think) gentoo just fucking gets it right (nearly) every time, somehow --- # requirements-to-freeze.txt (typical mostly-unconstrained Method #1) is used to specify your top-level dependencies, and any explicit versions you need to specify. # requirements.txt (fully-versioned Method #2) contains the output of $ pip freeze after $ pip install requirements-to-freeze.txt has been run. $ cd project-repo $ pip install -r requirements-to-freeze.txt --upgrade Installing collected packages: six, enum34, ipaddress, ... $ pip freeze > requirements.txt # The best of both worlds.
Creating modules that can be imported OR run directly
Set up your module like this:
#!/bin/env python from __future__ import print_function import argparse import sys def main(argv): parser = argparse.ArgumentParser(description='Run a performance test') parser.add_argument( '--server', dest='serveraddr', type=str, action='store', help='address of server',required=True) parser.add_argument( '--client', dest='clientaddr', type=str, action='store', help='address of client', required=True) parser.add_argument( '--port', dest='port', type=int, action='store', help='port', required=True) parser.add_argument( '--count', dest='count', type=int, action='store', default=100, help='number of objects') args = parser.parse_args(argv) # code it up # use dest values, eg: args.serveraddr return 0 # Only run main if we called this directly, so we can use this as an import elsewhere if __name__ == '__main__': main(sys.argv)
Run it directly (do chmod +x on it and you don't even need to prepend [python ...]):
# either way ./performance_test.py --server=10.122.82.241 --client=10.122.83.57 --port=5000 ./performance_test.py --server 10.122.82.241 --client 10.122.83.57 --port 5000
Run it from inside other python code like this:
#!/bin/env python import performance_test performance_test.main(['--server=10.122.82.241','--client=10.122.83.57','--port=5000']);