pipehappy <pipehappy <at> gmail.com> writes:
>
> Hello everyone:
>
> Is there a way to check the type when do assignment?
>
> if I write:
> ab = bc
> and want to make sure the return value of isinstance(bc, klass) is True
> or I will raise
> a exception.
>
> Any suggestion?
>
1. Check your condition before the assignment: (IMO one-liners are over-rated)
if not isinstance(bc, klass):
raise TypeError # or do whatever else is appropriate
ab = bc
2. If you really insist on doing this in a single statement (in the assignment
itself), write a function for it:
def assert_type(obj, klass):
if not isinstance(bc, klass):
raise TypeError
return obj
ab = assert_type(bc, klass)
Or to be more generic:
def assert_return(obj, func):
assert func(obj)
return obj
ab = assert_return(bc, lambda obj:isinstance(obj, klass))
- Tal
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