Calling a function of a module by using its name (a string)
What is the best way to go about calling a function given a string with the function's name in a Python program. For example, let's say that I have a module foo , and I have a string whose contents are "bar" . What is the best way to go about calling foo.bar() ?
I need to get the return value of the function, which is why I don't just use eval . I figured out how to do it by using eval to define a temp function that returns the result of that function call, but I'm hoping that there is a more elegant way to do this.
Assuming module foo with method bar :
import foo
method_to_call = getattr(foo, 'bar')
result = method_to_call()
As far as that goes, lines 2 and 3 can be compressed to:
result = getattr(foo, 'bar')()
if that makes more sense for your use case. You can use getattr in this fashion on class instance bound methods, module-level methods, class methods... the list goes on.
locals()["myfunction"]()
or
globals()["myfunction"]()
locals returns a dictionary with a current local symbol table. globals returns a dictionary with global symbol table.
Patrick's solution is probably the cleanest. If you need to dynamically pick up the module as well, you can import it like:
module = __import__('foo')
func = getattr(module, 'bar')
func()
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