Question

I have some code that is structured as follows

from my.modules import MyClass

Class AnotherClass(object):

  def __init__(a): #line 5
    if a:
      setup_a()
    else:
      setup_b()

  def setup_a():
    # Do some stuff to get local_x
    # ..
    self.a = MyClass(local_x)

  def setup_b():
    # Do some stuff to get local_y
    # ..
    self.b = MyClass(local_y)

However I run with a = True in line 5 it runs fine, but when I run with a = False I get an UnboundedLocalError. I understand what causes this normally (modifying a global variable) and if I change setup_b() to:

def setup_b():
        global MyClass
        # Do some stuff to get local_y
        # ..
        self.b = MyClass(local_y)

It works correctly. I just don’t understand why I am getting this error as I am not modifying the MyClass by instantiating it.

Note: The above example is a basic version of the code not the actual code producing the error.
Does anyone know what is causing this error?

Answer 1

Somewhere in the code you’re not showing you’re assigning to MyClass, making the compiler think that it’s a local variable when it’s not.