Index

1. Python is used in many areas of computing

• games
  • ChessBoard - 2.01
  • Invasores - 0.9
• network administration
• GNU/Linux configuration
• plug-ins for 3D modelling environments
  • blender

2. Blender

• Blender is the open source software for 3D modelling, animation, rendering, post-production, interactive creation and playback
  • GPL
• can add python plug-ins to import and export from/to different file formats:
  • md3, md4 (Quake 3) with md3import.py
• can use Python to model scenes

3. Blender camera module

• module provides access to Camera Data objects in Blender

• from Blender import Camera, Object, Scene
  
  
  c = Camera.New("ortho")     # create new ortho camera data
  c.lens = 35.0               # set lens value
  cur = Scene.getCurrent()    # get current scene
  ob = Object.New("Camera")   # make camera object
  ob.link(c)                  # link camera data with this object
  cur.link(ob)                # link object into scene
  cur.setCurrentCamera(ob)    # make this camera the active"

4. Module Lamp

• the module provides control over Lamp Data objects in Blender

• from Blender import Lamp
  
  
  l = Lamp.New("Spot")            # create new "Spot" lamp data
  l.setMode("square", "shadow")   # set these two lamp mode flags
  ob = Object.New("Lamp")         # create new lamp object
  ob.link(l)                      # link lamp obj with lamp data

5. Installing your own Python Modules

• setup (name="mymodule",
         version="0.1",
         py_modules=["mymodule"],
         description="mymodule is a Python module to do something",
         author="Fred Bloggs",
         author_email="fred@no.org",
         url="http://mymodule.bloggs.org",
         license="GPL license",
         platforms="UNIX",
  )

• call this from your Makefile as part of the install target

• install: force
          python setup.py install

6. pexpect module

• is a third party module which is extremely useful
• allows the caller to invoke a command line program and interact with it, from Python
• easy to invoke the command line gnuchess program and interact with it and produce a GUI front end onto this program
• also easy to make gnuchess play against another gnuchess program

7. automating ftp

• import pexpect
  import sys
  
  
  child = pexpect.spawn("ftp ftp.openbsd.org")
  child.expect("(?i)name .*: ")
  child.sendline("anonymous")
  child.expect("(?i)password")
  child.sendline("pexpect@sourceforge.net")
  child.expect("ftp> ")

• child.sendline("cd /pub/OpenBSD/3.7/packages/i386")
  child.expect("ftp> ")
  child.sendline("bin")
  child.expect("ftp> ")
  child.sendline("prompt")
  child.expect("ftp> ")
  child.sendline("pwd")
  child.expect("ftp> ")
  print("Escape character is \"^]\".\n")
  sys.stdout.write (child.after)
  sys.stdout.flush()

• child.interact() # Escape character defaults to ^]
  # At this point this script blocks until the user presses
  # the escape character or until the child exits.
  # The human user and the child should be talking
  # to each other now.
  
  
  # At this point the script is running again.
  print "Left interactive mode."

• #
  # The rest is not strictly necessary. This just
  # demonstrates a few functions.  This makes sure the
  # child is dead; although it would be killed when Python exits.
  if child.isalive():
      child.sendline("bye") # Try to ask ftp child to exit.
      child.close()
  # Print the final state of the child. Normally isalive() should
  # be FALSE.
  if child.isalive():
      print "Child did not exit gracefully."
  else:
      print "Child exited gracefully."

Index

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