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| 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. |
| 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 |
| if do that, the python will raise a exceptiog about 'str hasnot callable' |
| Why? |
| for a param string, there isnt callable on it. |
| See globals() built-in function. |
| I don't get what you mean |
| at first, we may convert that string to func, which func can do this? Like int ('12') |
| No. You won't do it like this. I think there is no such function. |
| 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 |
| i wanna pass a string to a class, so that that class can invoke that directly. |
