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  1. import sys
  2. import copy
  3. import types
  4. from inspect import isfunction
  5.  
  6. class UsingHolder:
  7.     def __init__(self, frame, old_locals):
  8.         self.frame = frame
  9.         self.old_locals = old_locals
  10.  
  11.     def __enter__(self):
  12.         print 'Using is entered'
  13.  
  14.     def __exit__(self, type, value, tb):
  15.         for local in self.frame.f_locals.keys():
  16.             if local not in self.old_locals:
  17.                 del self.frame.f_locals[local]
  18.  
  19.         print 'Using holder is deleted'
  20.  
  21. def using(o):
  22.     frame = sys._getframe().f_back
  23.     old_locals = copy.copy(frame.f_locals)
  24.  
  25.     frame.f_locals.update(o.__dict__)
  26.     for n, f in o.__class__.__dict__.items():
  27.         if isfunction(f):
  28.             frame.f_locals[n] = lambda *args, **kwargs: f(o, *args, **kwargs)
  29.  
  30.     return UsingHolder(frame, old_locals)
  31.  
  32. class A:
  33.     def __init__(self):
  34.         self.i = 10
  35.  
  36.     def f(self, j):
  37.         print self.i, j
  38.  
  39.     @staticmethod
  40.     def g():
  41.         pass
  42.  
  43. def do_something():
  44.     a = A()
  45.     with using(a):
  46.         exec('')
  47.         f(20)
  48.  
  49. do_something()
  50.  
Success #stdin #stdout 0.06s 9008KB
comments (?)
stdin 
Standard input is empty
stdout 
Using is entered
10 20
Using holder is deleted
https://ideone.com/kW8brJ
language:
Python (cpython 2.7.16)
created:
12 years ago
visibility:
public

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