[jomanda]

Hi, if I have a string, such as 'invokeapp', how can i know that func named 'invokeapp' is exists as well?
That is i wanna invoke any func by string.
But i need to chech whether that func was exist.

[Roombor]

exec 'try: invokeapp'; except: print" the function does not exist";else:print "it exists"'
Something like that
Exec and try-except are the keys to this problem

[jomanda]

if do that, the python will raise a exceptiog about 'str hasnot callable'

[Roombor]

Why?

[jomanda]

for a param string, there isnt callable on it.

[WarChild]

See globals() built-in function.

[Roombor]

I don't get what you mean

[jomanda]

at first, we may convert that string to func, which func can do this?
Like int ('12')

[Roombor]

No. You won't do it like this. I think there is no such function.

[Klimapol]

jomanda, Do you really need to use this horrid exec stuff?
How about a dictionary of names to functions? The added benefit is that you can control which functions can be invoked