Update 2012-01-06

---

Update 2012-01-06: Warning: this post is what you get if you don't know about the function __import__ and try to reinvent it.

---

Imagine I have two different python files that are drop-in replacements for each other, perhaps for some kind of plugin system:

  $ cat a/c.py
  def d():
     print "hello world a"
  $ c...