howto load and unload a module

[Peter Hansen]

John Machin wrote:
> Peter Hansen wrote:
[sample code]
> Ummm ... doesn't appear to scale well for multiple modules and multiple 
> attributes & functions. 

It certainly wouldn't! :-)  I was posting mainly to elicit more 
information, since clearly you wouldn't get far hardcoding all the names 
you were interested in.  (It's hard to judge a poster's level of 
expertise in Python without any example code from him.  That makes it 
too likely to go way above the head of the poster, and possibly provide 
a much more complex solution than he really needs.)

> Try something like this (mostly tested):
> 
> modules = ['foomod', 'barmod', 'brentstr', 'zotmod']
> attrs = ['att1', 'att2', 'att3', 'MyString']
> funcs = ['fun1', 'fun2', 'fun3']
> # the above could even be read from file(s)
> for modname in modules:
>     try:
>         mod = __import__(modname)
>     except ImportError:
>         print "module", modname, "not found"
>         continue
>     for attrname in attrs:
>         try:
>             attr = getattr(mod, attrname)
>         except AttributeError:
>             print "module %s has no attribute named %s" % \
>                 (modname, attrname)
>             continue
>         # check that attr is NOT a function (maybe)
>     for funcname in funcs:
>         pass
>         # similar to above but check that it IS a function

Of course, one could simply hand the man a complete answer... ;-)

-Peter