Upper case variable names in functions causes ruby error: dynamic constant assignment

[jayvdb]

Python

def f():
  CODES = {"KEY": 1}
  return CODES

becomes

def f()
  CODES = {"KEY" => 1}
end

Ruby complains that CODES is a constant, when it was a local variable in Python.

foo.rb:2: dynamic constant assignment
  CODES = {"KEY" => 1}