On 08/26/2017 09:25 AM, Yury Selivanov wrote:
On Fri, Aug 25, 2017 at 10:19 PM, Ethan Furman wrote:
A *context variable* is an object representing a value in the
execution context. A new context variable is created by calling
the ``new_context_var()`` function. A context variable object has
two methods:
* ``lookup()``: returns the value of the variable in the current
execution context;
* ``set()``: sets the value of the variable in the current
execution context.
Why "lookup" and not "get" ? Many APIs use "get" and it's functionality is
well understood.
ContextVar.set(value) method writes the `value` to the *topmost LC*.
ContextVar.lookup() method *traverses the stack* until it finds the LC
that has a value. "get()" does not reflect this subtle semantics
difference.
A good point; however, ChainMap, which behaves similarly as far as lookup goes, uses "get" and does not have a "lookup"
method. I think we lose more than we gain by changing that method name.
--
~Ethan~
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