Resolve circular import error in python [duplicate]

Answer 1

The __init__ method executes when you create an instance of the class. In this case, you should get it to work by simply changing the import statements like this:

import a 
class B:
  def __init__(self):
    self.a = a.A(self)

---

import b
class A:
  def __init__(self, ref):
    assert isinstance(ref, b.B)
    self.ref = ref