Calling constructor of unknown classes

[Lars Heuer]

Hi all,

I try to do the following:

map = {'some.thing':'ClassName'}

try:
mod = __import___(map.keys()[0], {}, {}, map.values()[0])

# Now I want to return an instance of the class in
# map.values()[0]

# I've to do something like "return mod.(map.values()[0])()"


How to return the instance of the 'unknown' class? I've only the name
as string. I tried eval, but I don't get it work.

Thanks,
Lars

 

[John Roth]

Hi all,

I try to do the following:

map = {'some.thing':'ClassName'}

try:
mod = __import___(map.keys()[0], {}, {}, map.values()[0])

# Now I want to return an instance of the class in
# map.values()[0]

# I've to do something like "return mod.(map.values()[0])()"


How to return the instance of the 'unknown' class? I've only the name
as string. I tried eval, but I don't get it work.

Thanks,
Lars

Since you know the module (you just imported it), do something
like this:

klas = getattr(mod, "className")

instance = klas()

John Roth

 

[Lars Heuer]

Hi John,

Since you know the module (you just imported it), do something
like this:

klas = getattr(mod, "className")

instance = klas()

Thanks. I tried something similar, but instead of my way, your way works.

Best regards,
Lars