What’s makes Python awesome? (Raymond Hettiger)


  • License

  • Commercial distros (ActiveState/Enthought)

  • Zen of Python

  • Community

  • Repository of Modules (PyPI)

  • Killer apps (Django, Pandas, etc)

  • Win32

  • books

High level qualities of Python

  • Ease of learning
  • Rapid development cycle
  • Economy of expression
  • Readability and Beauty
  • One way to do it
  • Interactive prompt
  • Batteries includes
  • Protocols: WSGI, dbapi, etc
# search directory tree for all diplicate files
import hashlib, os, pprint

hashmap = {} # content signature -> list of filenames
for path, dirs, files in os.walk('.'):
    for filename in files:
        fullname = os.path.join(path, filename)
        with open(fullname) as f:
            d =
        h = hashlib.md5(d).hexdigest()
        filelist = hashmap.setdefault(h, [])


  • This is how we write pseudo-code in or out of Python
  • Contributes to the uncluttered feel of the language

List comprehensions

  • arguably the most loved feature of the language

  • How much stuff should we put on one line?

    • Each list comprehension should represent a single English sentence


  • Easiest way to write an iterator
  • Simple syntax, only adds the YIELD keyword

Generator Expressions

  • Same syntax as list comprehensions but with parenthesis instead of brackets
  • Acts as a generator
  • reduces memory footprints exponentially.


Giant embarrassing oops by pydanny: At PyCon Philippines 2012 I demonstrated a Gajillionitem element generator expression in my shell, but used brackets instead of parenthesis.


  • Expressive
  • Easy on the eyes
  • Works for functions, methods, and classes
  • Adds powerful layer of composable tools

Abstract Base Classes

Uniform definition of what it means to be a sequence, mapping, etc

Ability to override is isinstance() and issubclass()

  • The new duck-typing “If it says it’s a duck…”

Mix-in capability


Unbelievably good people coming into things

Guido Van Rossum


Van Lindburgh