Newbie: How can I use a string value for a keyword argument?
morse at edoug.org
Mon Feb 25 12:42:00 CET 2008
My apologies for troubling for what is probably an easy question... it's just
that can't seem to find an answer to this anywhere (Googling, pydocs, etc.)...
I have a class method, MyClass.foo(), that takes keyword arguments. For
example, I can say:
x = MyClass()
Works just fine.
What I need to be able to do is call foo() with a string value specifying the
keyword (or both the keyword and value would be fine), something along the
x = MyClass()
y = 'trials=32'
x.foo(y) # doesn't work
y = 'trials'
x.foo(y = 32) # does the "wrong" thing
Surely there's some way to use a string's value as the key for making a method
call with a keyword argument?
Just for completeness, my goal is simply to read a bunch of key/value pairs
from an INI file (using ConfigObj) and then use those key/value pairs to set a
(3rd party) object's parameters, which must be done with a call along the
lines of "instance.set(key=value)". Obviously, I could create a huge if..elif
statement along the lines of "if y = 'trials': x.foo(trials=32); elif y =
'speed': x.foo(speed=12);" etc., but then the statement has to be maintained
every time a new parameter is added/changed etc. Plus, such a solution seems
to me grossly inelegant and un-Pythonic.
Thanks in advance for any and all assistance!
More information about the Python-list