Хук Python

def hook(frame,name,value):
    print(frame,name,value)
setvarhook(hook)
x = 5 # <frame at 0x00465C28, file 'main.py', line 4, code <module>> x 5
y = 3 # <frame at 0x00655C28, file 'main.py', line 5, code <module>> y 3

import io
from token import *
from tokenize import tokenize
 
text = '''\
x = 7
y = x * 2
z = y*x
a = x+y*z
b = a*3
c = a+b-y*z//x
print(input())
'''
result = set()
gen = tokenize(io.BytesIO(text.encode('utf-8')).readline)
token = next(gen) # ENCODING
while True:
    token = next(gen)
    if token.type == ENDMARKER:
        break
    if token.type == NAME:
        value = token.string
        token = next(gen)
        # <id> = …
        if token.type == OP and token.string == '=':
            result.add(value)
            token = next(gen)
    while token.type != NEWLINE:
        token = next(gen)        
print('vars =', result)

class Settings:
   def __init__(self):
      self.__value = "init_value"
 
 
   def __value_changed(self,old_value,new_value):   
      print("value changed:",old_value,"to",new_value)
      
   def __set_value(self,new_value):
      self.__value_changed(self.__value,new_value)
      self.__value = new_value
            
   def __get_value(self):
      return self.__value
      
   value = property(__get_value,__set_value)   
   
   
settings = Settings();
settings.value = "new_value"

import io
from token import *
from tokenize import tokenize
 
text = '''\
x = 7
y = x * 2
x = 5
z = y*x
a = x+y*z
b = a*3
c = a+b-y*z//x
'''
g, l = {}, {}
gen = tokenize(io.BytesIO(text.encode('utf-8')).readline)
token = next(gen) # ENCODING
while True:
    token = next(gen)
    if token.type == ENDMARKER:
        break
    if token.type == NAME:
        value = token.string
        token = next(gen)
        # <id> = …
        if token.type == OP and token.string == '=':
            l_old = l.copy()
            exec(token.line, g, l)
            print('var {} = {} (old={})'.format(value, l[value], l_old.get(value)))
            token = next(gen)
    while token.type != NEWLINE:
        token = next(gen)