On Wed, 30 Mar 2016 10:21 pm, Jussi Piitulainen wrote:
> Ok, safer to say that some many-to-one mappings are not surjective.
Can you give an example of a Python dict which is not surjective?
Or an example of something which obeys the Mapping ABC which is not
surjective?
Artificial and contrived examples such as this do not count:
class MyDict(dict):
def values(self):
for value in super().values():
yield value
yield object() # It's a value without a key!
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Steven
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