How to Fetch function using string?

Question

I want to fetch function with function name string eg.

class test(object):
  def fetch_function():
    print "Function is call"

 #now i want to fetch function  using  string 
 "fetch_function()"

Result should be: Function is call

You could use eval: eval("fetch_function()") It's not too safe tho, it opens a route for many hackers. — user2032433
– user2032433, Commented Jun 18, 2013 at 9:25
@ Markus Meskanen : thanx for answer but my issue is that string fix "fetch_function()" i dont want to make any change in that in that case your solution is not work. — Heroic
– Heroic, Commented Jun 18, 2013 at 9:27
@Heroic You should then clarify your question. What shouldn't be changed? If the string must just stand in your code as it does currently there can't be done very much — Michael Butscher
– Michael Butscher, Commented Jun 18, 2013 at 9:38
I have already mention in my question that i want to fetch using string "fetch_function()". — Heroic
– Heroic, Commented Jun 18, 2013 at 10:04

gitaarik · Accepted Answer · 2014-02-18 23:42:32Z

4

If you would leave the () from fetch_function() you could use getattr which is in my opinion safer than eval:

class Test(object):

    def fetch_function():
        print "Function is called"

test_instance = Test()
my_func = getattr(test_instance, 'fetch_function')

# now you can call my_func just like a regular function:
my_func()

edited Feb 18, 2014 at 23:42

answered Jun 18, 2013 at 9:44

gitaarik

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2 Comments

user2032433 Over a year ago

And if you need to call the method only once, there's no need for the variable: getattr(inst, "fetch_function")()

Heroic Over a year ago

@rednaw : Thanx for your answer ,but i cant leave ().

Franck Dernoncourt · Accepted Answer · 2013-06-18 09:25:36Z

1

Use eval():

eval("fetch_function()")

answered Jun 18, 2013 at 9:25

Franck Dernoncourt

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Comments

Ali SAID OMAR · Accepted Answer · 2013-06-18 09:49:00Z

0

As said eval is not safe, you could use a dict to map a function to a string and call it

class test(object):
  dict_map_func = {'fetch_f': fetch_function}
  def fetch_function():
     print "Function is call"


test.dict_map_func['fetch_f']()

answered Jun 18, 2013 at 9:49

Ali SAID OMAR

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