calling variable function name ?

[TkNeo]

I don't know the exact terminology in python, but this is something i
am trying to do

i have 3 functions lets say
FA(param1,param 2)
FB(param1,param 2)
FC(param1,param 2)

temp = "B" #something entered by user. now i want to call FB. I don't
want to do an if else because if have way too many methods like
this...

var = "F" + temp
var(param1, param2)

This does not work ofcourse. Does anyone know how to implement this ?

[Arnaud Delobelle]

Re: calling variable function name ?

On Apr 8, 8:52 pm, TkNeo <tarun....@gmai l.comwrote:

I don't know the exact terminology in python, but this is something i
am trying to do
>
i have 3 functions lets say
FA(param1,param 2)
FB(param1,param 2)
FC(param1,param 2)
>
temp = "B" #something entered by user. now i want to call FB. I don't
want to do an if else because if have way too many methods like
this...
>
var = "F" + temp
var(param1, param2)
>
This does not work ofcourse. Does anyone know how to implement this ?

F = { 'A': FA, 'B':FB, 'C':FC }

F['A'](param1, param2)

HTH

--
Arnaud

[George Sakkis]

Re: calling variable function name ?

On Apr 8, 3:52 pm, TkNeo <tarun....@gmai l.comwrote:

I don't know the exact terminology in python, but this is something i
am trying to do
>
i have 3 functions lets say
FA(param1,param 2)
FB(param1,param 2)
FC(param1,param 2)
>
temp = "B" #something entered by user. now i want to call FB. I don't
want to do an if else because if have way too many methods like
this...
>
var = "F" + temp
var(param1, param2)

Try this:

func = globals()["F" + temp]
func(param1, param2)

HTH,
George

[TkNeo]

Re: calling variable function name ?

On Apr 8, 7:51 pm, George Sakkis <george.sak...@ gmail.comwrote:

On Apr 8, 3:52 pm,TkNeo<tarun. ...@gmail.comwr ote:
>

I don't know the exact terminology in python, but this is something i
am trying to do

>

i have 3 functions lets say
FA(param1,param 2)
FB(param1,param 2)
FC(param1,param 2)

>

temp = "B" #something entered by user. now i want to call FB. I don't
want to do an if else because if have way too many methods like
this...

>

var = "F" + temp
var(param1, param2)

>
Try this:
>
func = globals()["F" + temp]
func(param1, param2)
>
HTH,
George

George - Thanks for your reply but what you suggested is not working:

def FA(param1,param 2):
print "FA" + param1 + " " + param2
def FA(param1,param 2):
print "FB" + param1 + " " + param2
def FA(param1,param 2):
print "FC" + param1 + " " + param2

temp = sys.argv[1]

func = globals()["F" + temp]
func("Hello", "World")


I ran the script with first parameter as B and i get the following
message
KeyError: 'FB'

[Arnaud Delobelle]

Re: calling variable function name ?

TkNeo <tarun.kap@gmai l.comwrites:

>
George - Thanks for your reply but what you suggested is not working:
>
def FA(param1,param 2):
print "FA" + param1 + " " + param2
def FA(param1,param 2):
print "FB" + param1 + " " + param2
def FA(param1,param 2):
print "FC" + param1 + " " + param2
>
temp = sys.argv[1]
>
func = globals()["F" + temp]
func("Hello", "World")
>
>
I ran the script with first parameter as B and i get the following
message
KeyError: 'FB'

Perhaps if you call your three function FA, FB, FC instead of FA, FA,
FA it'll help?

--
Arnaud

[thinkofwhy]

Re: calling variable function name ?

Try a dictionary:

def funcA(blah, blah)
def funcB(blah, blah)
def funcC(blah, blah)
functions = {'A': funcA, 'B': funcB, 'C':
funcC}
user_func = 'A'
functions[user_func] #execute function


"Arnaud Delobelle" <arnodel@google mail.comwrote
in message news:m28wyvba54 .fsf@googlemail .com...

TkNeo <tarun.kap@gmai l.comwrites:
>

>>
>George - Thanks for your reply but what you
>suggested is not working:
>>
>def FA(param1,param 2):
> print "FA" + param1 + " " + param2
>def FA(param1,param 2):
> print "FB" + param1 + " " + param2
>def FA(param1,param 2):
> print "FC" + param1 + " " + param2
>>
>temp = sys.argv[1]
>>
>func = globals()["F" + temp]
>func("Hello" , "World")
>>
>>
>I ran the script with first parameter as B and
>i get the following
>message
>KeyError: 'FB'

>
Perhaps if you call your three function FA, FB,
FC instead of FA, FA,
FA it'll help?
>
--
Arnaud

[Duncan Booth]

Re: calling variable function name ?

"thinkofwhy " <thinkofwhy@yah oo.cawrote:

Try a dictionary:
>
def funcA(blah, blah)
def funcB(blah, blah)
def funcC(blah, blah)
functions = {'A': funcA, 'B': funcB, 'C':
funcC}
user_func = 'A'
functions[user_func] #execute function

Python has a neat concept for making this easy :^) it is called a class.

class MyFunctions(obj ect):
def funcA(self, param1, param2):
print "FA " + param1 + " " + param2

def funcB(self, param1, param2):
print "FB " + param1 + " " + param2

def funcC(self, param1, param2):
print "FC " + param1 + " " + param2

def defaultFunc(sel f, *args):
print "Command not recognised"

def doCommand(self, cmd, *args):
return getattr(self, 'func'+cmd, self.defaultFun c)(*args)

functions = MyFunctions()
result = functions.doCom mand('A', 'foo', 'bar')

You have to add an extra 'self' argument to each function (or make it a
staticmethod), but you could always use it to store state without resorting
to globals.

[TkNeo]

Re: calling variable function name ?

On Apr 30, 11:05 am, Arnaud Delobelle <arno...@google mail.comwrote:

TkNeo<tarun.... @gmail.comwrite s:
>

George - Thanks for your reply but what you suggested is not working:

>

def FA(param1,param 2):
print "FA" + param1 + " " + param2
def FA(param1,param 2):
print "FB" + param1 + " " + param2
def FA(param1,param 2):
print "FC" + param1 + " " + param2

>

temp = sys.argv[1]

>

func = globals()["F" + temp]
func("Hello", "World")

>

I ran the script with first parameter as B and i get the following
message
KeyError: 'FB'

>
Perhaps if you call your three function FA, FB, FC instead of FA, FA,
FA it'll help?
>
--
Arnaud

oh crap. I can't believe I was doing that ! :) Thanks for pointing
out. works perfect.