Hard to understand 'eval'
bruno.42.desthuilliers at websiteburo.invalid
Mon Jun 16 11:18:53 CEST 2008
TheSaint a écrit :
> On 01:15, lunedì 16 giugno 2008 Calvin Spealman wrote:
>> such as getattr(obj,
>> methname)(a, b, c). Does this make sense?
> This is big enlightenment :) Thank you! :)
> I found problem with eval() when it comes to pass quoted strings.
> I circumvent that by encapsulating the strings in variable or tuple.
> The principle is to have a name which will refers a function somewhere in the
> program and to call that function, plus additional data passed in.
> In other word I'd expect something:
> function_list= ['add' ,'paint', 'read']
> for func in function_list:
Can't work - function_list is a list of strings, not a list of
functions. If the functions you intend to call are already bound to
names in the current scope, you don't even need any extra lookup
# code here
from some_module import paint
obj = SomeClass()
read = obj.read
functions = [add, paint, read]
args = [1, 2]
for func in functions:
> I tried getattr,
getattr is useful when you only have the name of the
function/method/whatever attribute as a string. And a target object
(hint: modules are objects too) of course - if the name lives either in
the global or local namespace, you can access it by name using the dicts
returned by resp. the globals() and locals() functions.
More information about the Python-list