====== Python ======

Important things to know in python:

===== How to read command line arguments =====

==== Simple approach ====


  import sys
  print sys.argv # this is an array containing all command line arguments inclusive the program name


==== OptParse ====

  from optparse import OptionParser
  parser = OptionParser()
  parser.add_option("-f", "--file", dest="filename",
                    help="write report to FILE", metavar="FILE")
  parser.add_option("-q", "--quiet",
                    action="store_false", dest="verbose", default=True,
                    help="don't print status messages to stdout")
  (options, args) = parser.parse_args()

===== How to make a python source code file executable =====

Code example:

  #!/usr/bin/env python # this finds the default python executable defined by the current environment (PATH).
  print "test"

In the console don't forget to give executable permissions:

  chmod +x example.py

===== Important functions =====

  os.walk("dir")
  os.*
  sys.argv

===== Important modules =====

  optparse
  multiprocessing
  numpy