Built-in functions and keyword arguments
Duncan Booth
duncan.booth at invalid.invalid
Mon Oct 29 14:45:22 EDT 2007
"J. Clifford Dyer" <jcd at sdf.lonestar.org> wrote:
>> I think you are being a little bit unfair here: help(len) says:
>>
>> len(...)
>> len(object) -> integer
>>
>> Return the number of items of a sequence or mapping.
>>
>> which implies that the argument to len has the name 'object'
>> (although in fact it doesn't have a name). The OP was simply asking
>> about the difference in calling conventions, not proposing to write
>> code using 'object' as the argument name.
>
> Hmm.... To my mind, that just implies that the *type* of the expected
> input is an object. Just like the "-> integer" tells you that the
> type of the output is an integer. If the documentation read
> "len(s=object) -> integer", then I would expect a keyword argument s
> typed as an object.
>
How do you interpret:
>>> help(__import__)
Help on built-in function __import__ in module __builtin__:
__import__(...)
__import__(name, globals={}, locals={}, fromlist=[], level=-1) ->
module
...
>>> help(int)
Help on class int in module __builtin__:
class int(object)
| int(x[, base]) -> integer
...
Can you find any case (other than a single parameter identified as
'object') where you can interpret the help string as telling you the types
of the parameters?
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