Python: How do I pass variables between class instances or get the caller?

Question

class foo():
  def __init__(self)
    self.var1 = 1

class bar():
  def __init__(self):
    print \"foo var1\"

f = foo()
b = bar()

In foo, I am do

Answer 1

Same as in any language.

class Foo(object):
    def __init__(self):
        self.x = 42

class Bar(object):
    def __init__(self, foo):
        print foo.x

a = Foo()
b = Bar(a)