On Wed, 02 Nov 2005 19:01:46 -0500, Mike Meyer <[EMAIL PROTECTED]> wrote:
>"Paul McGuire" <[EMAIL PROTECTED]> writes: >> "David Rasmussen" <[EMAIL PROTECTED]> wrote in message >> news:[EMAIL PROTECTED] >>> If I have a string that contains the name of a function, can I call it? >>> As in: >>> >>> def someFunction(): >>> print "Hello" >>> >>> s = "someFunction" >>> s() # I know this is wrong, but you get the idea... >>> >>> /David >> >> Lookup the function in the vars() dictionary. >> >>>>> def fn(x): >> ... return x*x >> ... >>>>> vars()['fn'] >> <function fn at 0x009D67B0> >>>>> vars()['fn'](100) >> 10000 > >vars() sans arguments is just locals, meaning it won't find functions >in the global name space if you use it inside a function: > >>>> def fn(x): >... print x >... >>>> def fn2(): >... vars()['fn']('Hello') >... >>>> fn2() >Traceback (most recent call last): > File "<stdin>", line 1, in ? > File "<stdin>", line 2, in fn2 >KeyError: 'fn' >>>> > >Using globals() in this case will work, but then won't find functions >defined in the local name space. > >For a lot of uses, it'd be better to build the dictionary by hand >rather than relying on one of the tools that turns a namespace into a >dictionary. IMO it would be nice if name lookup were as cleanly controllable and defined as attribute/method lookup. Is it a topic for py3k? Regards, Bengt Richter -- http://mail.python.org/mailman/listinfo/python-list
