[Python-ideas] proposal to add rowexpr as a keyword

[Steven Bethard]

On 5/30/07, Steve Howell <showell30 at yahoo.com> wrote:
> ======= THEORETICAL
>
> Valid Python:
>
> row = {'salary': 50000}
> def convert_to_euros(amt): return amt / 2
> x = rowexpr: convert_to_euros(salary)
> print x(row) # prints 25000

>>> def rowexpr(expr):
...     def evaluate(row):
...         d = dict(row)
...         d.update(globals())
...         exec '__result__ = ' + expr in d
...         return d['__result__']
...     return evaluate
...
>>> def convert_to_euros(amt):
...     return amt / 2
...
>>> x = rowexpr('convert_to_euros(salary)')
>>> row = dict(salary=50000)
>>> print x(row)
25000

STeVe
-- 
I'm not *in*-sane. Indeed, I am so far *out* of sane that you appear a
tiny blip on the distant coast of sanity.
        --- Bucky Katt, Get Fuzzy