Is there a way to loop through and execute all of the functions in a Python class?

def assignOrder(order):
  @decorator
  def do_assignment(to_func):
    to_func.order = order
    return to_func
  return do_assignment

class Foo():

  @assignOrder(1)
  def bar(self):
    print "bar"

  @assignOrder(2)
  def foo(self):
    print "foo"

  #don't decorate functions you don't want called
  def __init__(self):
    #don't call this one either!
    self.egg = 2

x = Foo()
functions = sorted(
             #get a list of fields that have the order set
             [
               getattr(x, field) for field in dir(x)
               if hasattr(getattr(x, field), "order")
             ],
             #sort them by their order
             key = (lambda field: field.order)
            )
for func in functions:
  func()

That funny @assignOrder(1) line above def bar(self) triggers this to happen:

Foo.bar = assignOrder(1)(Foo.bar)

assignOrder(1) returns a function that takes another function, changes it (adding the field order and setting it to 1) and returns it. This function is then called on the function it decorates (its order field gets thus set); the result replaces the original function.

It's a fancier, more readable and more maintainable way of saying:

  def bar(self):
    print "bar"
  Foo.bar.order = 1

No. You can access Foo.__dict__, and call each value in turn (catching errors for non-callable members), but the order is not preserved.

for callable in Foo.__dict__.values():
    try:
        callable()    
    except TypeError:
        pass

This assumes none of the functions take parameters, as in your example.

Since Python stores the methods (and other attributes) of a class in a dictionary, which is fundamentally unordered, this is impossible.

If you don't care about order, use the class's __dict__:

x = Foo()
results = []
for name, method in Foo.__dict__.iteritems():
    if callable(method):
        results.append(method(x))

This also works if the function takes extra parameters - just put them after the instance of the class.