Python Imports

Following is from David Beazley's talk.

• import foo and from foo import bar both execute the entire foo module. The latter is NOT a "smart" import in any way

• Imported functions record their definition environment

  # spam.py
  x = 42
  
  def blah(x):
      print(x)
  

  >>> from spam import blah
  >>> blah.__module__
  'spam'
  >>> blah.__globals__
  { 'x' : 42, ...}
  

• __init__.py can be used to stitch multiple modules together.

  # spam/foo.py
  
  class Foo:
      ...
  

  # spam/bar.py
  
  class Bar:
      ...
  

  # spam/__init__.py
  
  from .foo import Foo
  from .bar import Bar
  

  import spam
  
  foo = spam.Foo()
  bar = spam.Bar()