CODEWITHSUNDEEP
pythonmultithreadingmultiprocessing
user7355384
user7355384

Reputation: 49

Is there a way to execute multiple functions at the same time, but from a list?

I want to ask the user for inputs then store all inputs into a list. The inputs are going to be exactly the same spelling as the functions that I've defined.

inp =  raw_input("functions you want to execute, sep by commas:")
alist = []
for j in inp.split(','):
    alist.append(j)
def func1():
    print 'FUNCTION 1'

def func2():
    print 'FUNCTION 2'

def func3():
    print 'FUNCTION 3'

for i in alist:
    eval(i+'()') #I want to do this but all at the same time

In this case, when asked for input, and I want all 3 functions to be executed, the list is going to look like this: 

['func1','func2','func3']

What I want to do is to execute them all at the same time.

I have considered multiprocessing, but I don't know how to do it from a list.

Also, please do not lecture me about my usage of eval(), this code is for molecular dynamics simulation.

Upvotes: 1

Views: 65

Answers (1)

ᴘᴀɴᴀʏɪᴏᴛɪs
ᴘᴀɴᴀʏɪᴏᴛɪs

Reputation: 7529

You can use the multiprocessing module

from multiprocessing import Process

def A():
  print("A")

def B():
  print("B")

def runAll(fns):
  proc = []
  for fnName in fns:
    fn = globals()[fnName]
    p = Process(target=fn)
    p.start()
    proc.append(p)
  for p in proc:
    p.join()

Then you call them like so:

runAll(['A','B'])

If the functions are not defined in the same module then replace the globals line (globals()...) with:

fn = getattr(module, fnName)

Try it here: Repl.it

As a side note, allowing users to invoke arbitrary functions is a bad idea (security-wise). You could instead explicitly only accept actions from a list of predefined strings.

Upvotes: 1

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