Re: [Tutor] Calling a function by string name

[Smith, Jeff]

Title: Message

Fantastic...that really did the trick!  I actually made one modification since p4python allows you to run Perforce commands by calling them with obj.run_COMMAND(args) so the final solution was:

 

    def _p4run(self, method, *args):
        'runs a Perforce command'
        try:
            if callable(method):
                return method(*args)
            elif hasattr(self._client, method) and callable(getattr(self._client, method)):
                return getattr(self._client, method)(*args)
            elif hasattr(self._client, 'run_'+method) and callable(getattr(self._client, 'run_'+method)):
                return getattr(self._client, 'run_'+method)(*args)
            elif hasattr(self._client, method):
                raise TypeError(method) # not callable
            else:
                raise AttributeError(method) # no method/member with that name
        except p4.P4Client.error:
            raise
        except:
            if self._client.errors:
                raise p4.P4Client.error('\n'.join(self._client.errors))
            else:
                raise

Thanks,

Jeff

-----Original Message-----
From: Michael P. Reilly [mailto:[EMAIL PROTECTED]
Sent: Friday, July 21, 2006 1:36 PM
To: Smith, Jeff
Cc: tutor@python.org
Subject: Re: [Tutor] Calling a function by string name

On 7/21/06, Smith, Jeff <[EMAIL PROTECTED]> wrote:

I have an object and I want to call a method that I have constructed the name for in a string.

 

For example:

str_method = 'myfun'

obj.str_method

 

Of course, this fails.  I know I could probably do this with exec but is there a better way?

 

For context, the specific application is a wrapper to calling p4python. Note that the second return (under the else under the try) is where I want to call 'method' which is the string name of a method valid for self._client.

 

    def _p4runner(self, method, *args):
        'runs a Perforce command'
        try:
            if callable(method):
                return method(*args)

elif hasattr(self._client, method) and callable(getattr(self._client, method)):
    return getattr(self._client, method)(*args)
elif hasattr(self._client, method):
    raise TypeError(method) # not callable
else:
    raise AttributeError(method) # no method/member with that name

            else:
                return self._client.method(*args)
        except p4.P4Client.error:
            raise
        except:
            if self._client.errors:
                raise p4.P4Client.error('\n'.join(self._client.errors))
            else:
                raise

 

Clear as mud?

Crystally murky.

  -Arcege

--
There's so many different worlds,
So many different suns.
And we have just one world,
But we live in different ones.

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