Instantiating an object when the type is only known at runtime
tjreedy at udel.edu
Tue Oct 3 20:14:21 CEST 2006
"Samuel" <knipknap at gmail.com> wrote in message
news:1159883162.906612.292870 at c28g2000cwb.googlegroups.com...
> I am trying to replace the eval() in the following code:
> def myfunc(type, table):
> module = __import__(type)
> type = 'module' + '.' + type
> obj = eval(type)
> return obj(row[table.c.name], row[table.c.handle])
> I am out of ideas. Any hints?
Perhaps what you need is a dict 'types' mapping strings to types/classes.
Then the last two lines might become
return types[type](row[table.c.name], row[table.c.handle])
The trick of mapping names to callables for runtime choice of what to call
has several uses.
Terry Jan Reedy
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