dynamic execute a function by a string like 'module.function'

Question

if I have a string like 'module.function', How can I execute function just by one step? likesomefunction('os.error','args')

define mapping as mentioned on above linked answer or if the function is global globals()[func_name](params,..) where func_name is string. — Mutant, Dec 25 '13 at 03:41
@IgnacioVazquez-Abrams I do not think that solution is elegant. — ssj, Dec 25 '13 at 04:11
Beware of what you may think is "elegant" in Python, especially if you are coming from other languages. — Ignacio Vazquez-Abrams, Dec 25 '13 at 06:02

thefourtheye · Accepted Answer · 2013-12-25T04:16:33.237

1

You can dynamically get the modules using sys.modules and then you can use getattr to get the attributes from the module, like this

import sys
func = "os.error"
module, function = func.split(".", 1)
getattr(sys.modules[module], function)()

sys.modules can give only the modules which are already loaded. So, if you want to load a module dynamically you can use __import__ function like this

For example,

module, function = "math.factorial".split(".", 1)
print getattr(__import__(module), function)(5)

Output

edited Dec 25 '13 at 04:16

answered Dec 25 '13 at 04:10

thefourtheye

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sys.module can only work fine for python standard library, not for user-define module – ssj Dec 25 '13 at 04:16
@whatout I was already editing my answer :) Please check the update :) – thefourtheye Dec 25 '13 at 04:17

score 0 · Answer 2 · answered Dec 25 '13 at 03:28

0

All you need to do is

from module import function

and you'll be able to call

function(x, y, z)

in your code.

answered Dec 25 '13 at 03:28

MattDMo

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I think question is about using string name to call function. – Mutant Dec 25 '13 at 03:39
1

hmm, could be. It's not very clear.... – MattDMo Dec 25 '13 at 04:02

dynamic execute a function by a string like 'module.function'

2 Answers2