[Python] How can a function find the function that called it?

[Chris Gonnerman]

On 12/24/2010 10:24 AM, kj wrote:
> I want to implement a frozen and ordered dict.
>
> I thought I'd implement it as a subclass of collections.OrderedDict
> that prohibits all modifications to the dictionary after it has
> been initialized.
>
> In particular, calling this frozen subclass's update method should,
> in general, trigger an exception ("object is not mutable").
>
> But OrderedDict's functionality *requires* that its __init__ be
> run, and this __init__, in turn, does part of its initialization
> by calling the update method.
Use a flag, "private" to your new class, to indicate whether 
initialization is complete or not; your update method would see that 
initialization is not yet complete when called by __init__, and so it 
would do its business (calling the class method).  At the end of the 
__init__ function, set the initialized property to true.  If your update 
is called with the initialized property already set to true, it will 
raise the exception.