Need help to understand a getattr syntax.

[NMarcu]

Hello all,
I need some help to understand a getattr syntax. The syntax is:

try:
getattr(self, command)(cursor, row)
except Exception, e:
print "Action failed : '%s'" % command
raise e

I don't understand why is not like this: a = getattr(), and what are
the scope of the second (): (cursor, row)

Thanks.

 

[Diez B. Roggisch]

Hello all,
I need some help to understand a getattr syntax. The syntax is:

try:
getattr(self, command)(cursor, row)
except Exception, e:
print "Action failed : '%s'" % command
raise e

I don't understand why is not like this: a = getattr(), and what are
the scope of the second (): (cursor, row)

The attribute in question is a callable, a method most probably. So

getattr(self, command)

returns a reference to the method, and the following

(cursor, row)

calls it with cursor and row as parameters.

You could rewrite it as

method = getattr(self, command)
print method
method(cursor, row)

Diez