I picked some links from IBM developerworks:

1. Functional Programming in Python 1,2,3:

  * part1: http://www.ibm.com/developerworks/linux/library/l-prog/index.html , 
  * part2: http://www.ibm.com/developerworks/linux/library/l-prog2/index.html
  * part3: http://www.ibm.com/developerworks/linux/library/l-prog3/index.html

2. Decorators make magic easy: http://www.ibm.com/developerworks/linux/library/l-cpdecor/in...

3. Writing plugins pattern: http://www.ibm.com/developerworks/aix/library/au-cli_plugins...