Joseph Slater wrote:
> I'm trying to use the scipy.optimize code as an example to be able to
> avoid using *eval* to call a function named by a string.
>
> The following appears to be the code used to do this:
No, wrap_function wraps an existing function, adds some extra args, and
provides a way to keep track of the number of invocations. For example:
>>> def wrap_function(function, args):
... ncalls = [0]
... if function is None:
... return ncalls, None
... def function_wrapper(*wrapper_args):
... ncalls[0] += 1
... print(type(function))
... return function(*(wrapper_args + args))
... return ncalls, function_wrapper
...
>>> def demo(*args):
... print("demo() called with", args)
...
>>> f = wrap_function(demo, ("one", "two"))
>>> calls, func = wrap_function(demo, ("one", "two"))
>>> calls
[0]
>>> func("x", "y")
<class 'function'>
demo() called with ('x', 'y', 'one', 'two')
>>> calls
[1]
>>> func()
<class 'function'>
demo() called with ('one', 'two')
>>> calls
[2]
To get a function in the current module from its name use globals():
>>> def square(x):
... return x*x
...
>>> def twice(x):
... return 2*x
...
>>> f = globals()["square"]
>>> f(3)
9
>>> f = globals()["twice"]
>>> f(3)
6
For a function in an external module try getattr():
>>> import os.path
>>> f = getattr(os.path, "join")
>>> f("foo", "bar")
'foo/bar'
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor
