Please no. If you want lisp, use lisp (or something in the lisp family)
On Mon, Oct 5, 2020 at 5:53 AM Ricky Teachey <[email protected]> wrote:
> If you find yourself preferring this map() style of code a lot (rather
than using generator expressions), you can make a utility function:
def getter(obj):
return obj.__getitem__
or use the ones that are already in the stdlib:
In [3]: operator.attrgetter?
Init signature: operator.attrgetter(self, /, *args, **kwargs)
Docstring:
attrgetter(attr, ...) --> attrgetter object
Return a callable object that fetches the given attribute(s) from its
operand.
After f = attrgetter('name'), the call f(r) returns r.name.
After g = attrgetter('name', 'date'), the call g(r) returns (r.name,
r.date).
After h = attrgetter('name.first', 'name.last'), the call h(r) returns
(r.name.first, r.name.last).
-CHB
---
Ricky.
"I've never met a Kentucky man who wasn't either thinking about going home
or actually going home." - Happy Chandler
> On Mon, Oct 5, 2020 at 8:42 AM <[email protected]> wrote:
>
>> Hi all,
>>
>> I've been working in q and k, which is where this idea comes from.
>>
>> My idea is to make lists and dicts callable, with __call__ =
>> __getitem__.
>>
>> So that:
>>
>> [3,4,5](1) gives 4
>> {'a':1, 'b': 2}('b') gives 2
>>
>> Arguably a list is a function which maps from range(len(list)) to the
>> list entries, and a dictionary is a function that maps from keys to
>> values.
>>
>> This would mean that functions designed to take functions, can be
>> repurposed to take data, for example:
>>
>> map(lst, idxs) instead of (lst[i] for i in idxs) or map(lambda x:
>> lst[x], idxs)
>> map(dct, lst) instead of (dct[l] for l in lst)
>>
>> sorted(range(len(lst)), key=lst) to calculate the equivalent of
>> np.argsort
>> max(range(len(lst)), key=lst) to calculate the equivalent of np.argmax
>>
>> I couldn't find this being discussed before. Does anyone like it? There
>> is room for confusion as it would mean that e.g. filter([1,2], [0,1])
>> would give [0,1] whilst [1] might be expected.
>>
>> Best,
>>
>> George Harding
>>
>> p.s. Thank you to everyone for their work on such a wonderful language.
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--
Christopher Barker, PhD
Python Language Consulting
- Teaching
- Scientific Software Development
- Desktop GUI and Web Development
- wxPython, numpy, scipy, Cython
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