New submission from Alexander Marshalov <[email protected]>:
I was faced with the fact that the behavior of the functions "min"/"max" and
"sorted" is a little different.
For example, this code works fine:
>>> sorted([3, 2, 1], key=None)
[1, 2, 3]
But the same example for "min" and "max" doesn't work:
>>> min([3, 2, 1], key=None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
That is why the heapq library has this code:
...
def nsmallest(n, iterable, key=None):
...
if key is None:
result = min(it, default=sentinel)
else:
result = min(it, default=sentinel, key=key)
...
At the same time, there are many places where such checks are not performed for
the "sorted" function. I think the behavior of the "min" / "max" / "sorted"
functions should be unified. That is, they should work as if "None" is the
default value for "key".
----------
messages: 321891
nosy: amper
priority: normal
severity: normal
status: open
title: Behavior of the min/max with key=None
type: enhancement
versions: Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue34149>
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