Strange behaviour of CO_NEWLOCALS and function

[Boris Boutillier]

Here is a little example, where I create a new codeobject from one of a
function by just removing the CO_NEWLOCALS flags :

>>> import new
>>> CO_NEWLOCALS = 0x2
>>> 
>>> def g():
...     print 'locals in g :',locals()
...     if x: t=2
... 
>>> gcode = g.func_code
>>> 
>>> newcode = new.code(
...     gcode.co_argcount
... ,   gcode.co_nlocals
... ,   gcode.co_stacksize
... ,   gcode.co_flags & ~CO_NEWLOCALS
... ,   gcode.co_code
... ,   gcode.co_consts
... ,   gcode.co_names
... ,   gcode.co_varnames
... ,   gcode.co_filename
... ,   gcode.co_name
... ,   gcode.co_firstlineno
... ,   gcode.co_lnotab
... )
>>> 
>>> l = {'test':3,'toto':4,'t':2}
>>> g = {'x':1}
>>> 
>>> print l
{'test': 3, 'toto': 4, 't': 2}
>>> eval(newcode,g,l)
locals in g : {'test': 3, 'toto': 4}  # There is no more 't' here !!!
>>> print l
{'test': 3, 'toto': 4}                # 't' has been deleted from
dictionnary


The strange thing is that no new dictionnary is created as expected, but
local variable have been deleted from this dictionnary, why is this ? Is
there some way to modify my code to avoid this deletion ?

Boris

executio