Anonymization

Overview

This transformation renames most named entities in a program to have automatically generated names.

Each named entity is renamed to have the form parentName + "_" + kindPrefix + kindIndex, where:

parentName is the name of the entity's parent after renaming. The parent is usually the most nested scope owner that the entity's definition resides in. For example, the parent of a class method is the corresponding class. Global entities do not have a parent and, for them, parentName is considered to be empty. In this case, the separator _ is also omitted.
kindPrefix is one of the following, depending on what kind of entity is being renamed:

Prefix Kind

f Function

v Variable

c Class

p Parameter

m Import alias ("module")

l Lambda expression

Note: lambda expressions do not have a name, thus cannot be renamed. However, they are assigned a "name" in case it needs to be used as an entity's parentName.
kindIndex is a 1-based index of all entities of this entity's kind within its parent scope.

Any entities whose name starts with __ (two underscores) are not renamed. This, in particular, preserves special method names (__init__ etc.) and name mangling.
Any parameters of class methods that have one of the names self and cls are not renamed.
If any parentName starts with two underscores, those are trimmed. This sometimes helps to avoid unwanted name mangling.

var = 1
another_var = 2

def foo(param):
  inner = var

is transformed to:

v1 = 1
v2 = 2

def f1(f1_p1):
  f1_v1 = v1