On Wed, Mar 13, 2019 at 4:04 AM Ai Bo <boaisp...@gmail.com> wrote:
>
> I also tried with the example in the document but I got different result.
> sage: for i in range(7):
> ....:     print(len(list(graphs(i))))

Did you try this in a freshly opened Sage session?

In Python it is possible to break functionality of the system by e.g.
changing a library function,
e.g. if you created  a function called  graphs, you'd be surprised.

E.g.

sage: map(lambda m: len(list(graphs(m))), range(1,5)) # at it should be
[1, 2, 4, 11]
sage: def graphs(k):
....:     if k<2: return [1]
....:     return []
....:
sage: map(lambda m: len(list(graphs(m))), range(1,5)) # what you have now?
[1, 0, 0, 0]

---------------------

if something is still wrong you can run tests:

make ptest

and check the output in logs/ptest.log

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