Implicit lists

[Dale Strickland-Clark]

In many places, often small utility functions, I find myself using the
form:

lst = maybeAnArg
if type(lst) not in (list, tuple)
    lst = [lst]
for x in lst:
    whatever

or

lst = maybeAnArg
if type(lst) not in (list, tuple)
    lst = [lst]
mangle = [x for x in lst if whatever]


In other words, I want to be able to treat an argument of arbitrary
type as a list of 1 if it isn't already a list.

Has anyone got a neater way of doing this?

Thanks

--
Dale Strickland-Clark
Riverhall Systems Ltd