Using a dictionary to select function to execute

Question

I am trying to use functional programming to create a dictionary containing a key and a function to execute:

myDict={} myItems=("P1","P2","P3",...."Pn") def myMain(key):     def ExecP1():         pass     def ExecP2():         pass     def ExecP3():         pass         ...     def ExecPn():         pass   

Now, I have seen a code used to find the defined functions in a module, and I need to do something like this:

    for myitem in myItems:         myDict[myitem] = ??? #to dynamically find the corresponding function 

So my question is, How do I make a list of all the Exec functions and then assign them to the desired item using the a dictionary? so at the end I will have myDict["P1"]() #this will call ExecP1()

My real problem is that I have tons of those items and I making a library that will handle them so the final user only needs to call myMain("P1")

I think using the inspect module, but I am not so sure how to do it.

My reason to avoid:

def ExecPn():     pass myDict["Pn"]=ExecPn 

is that I have to protect code as I am using it to provide a scripting feature within my application.

Answer 1

Simplify, simplify, simplify:

def p1(args):     whatever  def p2(more args):     whatever  myDict = {     "P1": p1,     "P2": p2,     ...     "Pn": pn }  def myMain(name):     myDict[name]() 

That's all you need.

---

You might consider the use of dict.get with a callable default if name refers to an invalid function—

def myMain(name):     myDict.get(name, lambda: 'Invalid')() 

(Picked this neat trick up from Martijn Pieters)