[Python-ideas] 'Injecting' objects as function-local constants

[Alex Light]

Here is the source if anyone wants it.
--Alex

On Wed, Jun 15, 2011 at 3:04 PM, Terry Reedy <tjreedy at udel.edu> wrote:

> On 6/15/2011 11:48 AM, Alex Light wrote:
>
>     Alex Light dixit (2011-06-14, 13:44):
>>
>>     > >>>            frmglobals = func.__globals__.copy()
>>     > >>>            func.__globals__.update(localArgs)
>>     > >>>            ret= func(*args, **kwargs)
>>     > >>>            func.__globals__.clear()
>>     > >>>            func.__globals__.update(frmglobals)
>>
>
>   >>>            frmglobals = func.__globals__.copy()
>>  >>>            func.__globals__.update(localArgs)
>>  >>>            ret= func(*args, **kwargs)
>>  >>>            func.__globals__.clear()
>>  >>>            func.__globals__.update(frmglobals)
>>
>> with this one:
>>
>>  >>>            with _modifyGlobals(func.__globals__, localArgs):
>>  >>>                ret = func(*args, **kwargs)
>>
>> with  _modifyGlobals defined as:
>>
>>  >>>from contextlib import contextmanager
>>  >>>
>>  >>>@contextmanager
>>  >>>def _modifyGlobals(glbls, additions):
>>  >>>    frmglbls = glbls.copy()
>>  >>>    try:
>>  >>>        glbls.update(additions)
>>  >>>        yield
>>  >>>    finally:
>>  >>>        glbls.clear()
>>  >>>        glbls.update(frmglbls)
>>
>
> Posting code with all the '>>>' prompts added makes it terribly hard to cut
> and paste to try it out.
>
> --
> Terry Jan Reedy
>
>
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