list1.append(list2) returns None

[Ben Finney]

Pyenos <pyenos at pyenos.org> writes:

> def enlargetable(table,col):
>     return table.append(col)
>
> def removecolfromtable(table,col):
>     return table.remove(col)
>
> print enlargetable([[1],[2],[3]],[4]) # returns None
>
> Why does it return None instead of [[1],[2],[3],[4]] which I expected?

The answer is both "because that's what it's documented to do":

    s.append(x)    same as s[len(s):len(s)] = [x]
    <URL:http://docs.python.org/lib/typesseq-mutable.html>

and "because you asked it to *do* something, not *get* something":

    <URL:http://www.python.org/doc/faq/general.html#why-doesn-t-list-sort-return-the-sorted-list>

-- 
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_o__)                                                                  |
Ben Finney