CODEWITHSUNDEEP
pythonfunction
Kevin
Kevin

Reputation: 636

Taking a list of functions(with parameters) as input in python

My intention is to do this:

config = {"methods": ["function1(params1)", "function2(params2)"] }

This I read from a json file. So to use it, I need to pass it to another function as follows:

for method in config[methods]:
    foo(global()[method])

I know this wont work as the globals only converts the function name from a string to function but i need this to work for functions with parameters as well.

Also I have thought of this:

config = {"methods": [("function1", params1) , ("function2", params2)] }
for method in config[methods]:
    foo(global()[method[0]](method[1]))

This will work but I might have some functions for which I wouldn't require parameters. I don't want to have a condition check for whether the second entry in the tuple exists.

Is there any other way around this? I am open to change in the entire approach including the input format. Please do suggest.

Upvotes: 1

Views: 91

Answers (2)

yuvi
yuvi

Reputation: 18427

Here's a slight modification of @sshashank124 answer, which is simpler because it accepts the data differently. I think using 'f(arg1, arg2)' is not so intuitive, and gets very repetitive. Instead, I make it to dictionary pointing to a list of lists, each one represents an execution and only contains the arguments, thusly:

config = { "methods": {"a": [ ["hello"], ["hello","bye"], [] ]} }

means:

a("hello")
a("hello", "bye")
a()

I'm not sure it's any better than Shank's version, but I think it's easier to understand:

def a(*args):
    for i in args:
        print i

config = { "methods": {"a": [ ["hello"], ['hello','bye'], [] ]} }

for f,args in config['methods'].items():
    for arg in args:
        globals()[f](*arg)

DEMO

Upvotes: 0

sshashank124
sshashank124

Reputation: 32189

Here is a simplified example that works with any number of parameters:

from re import findall

def a(*args):
    for i in args:
        print i

config = {"methods": ["a('hello')", "a('hello','bye')", "a()"]}

for i in config['methods']:
    x,y = findall(r'(.*?)\((.*?)\)', i)[0]
    y = [i.strip() for i in y.split(',')]
    globals()[x](*y)


[OUTPUT]
'hello'
'hello'
'bye'

DEMO

Upvotes: 2

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