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129 lines
2.8 KiB
129 lines
2.8 KiB
# -*- coding: utf-8 -*-
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# © 2014-2015 ACSONE SA/NV (<http://acsone.eu>)
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# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).
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def _sum(l):
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""" Same as stdlib sum but returns None instead of 0
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in case of empty sequence.
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>>> sum([1])
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1
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>>> _sum([1])
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1
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>>> sum([1, 2])
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3
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>>> _sum([1, 2])
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3
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>>> sum([])
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0
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>>> _sum([])
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"""
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if not l:
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return None
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return sum(l)
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def _avg(l):
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""" Arithmetic mean of a sequence. Returns None in case of empty sequence.
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>>> _avg([1])
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1.0
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>>> _avg([1, 2])
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1.5
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>>> _avg([])
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"""
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if not l:
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return None
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return sum(l) / float(len(l))
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def _min(*args):
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""" Same as stdlib min but returns None instead of exception
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in case of empty sequence.
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>>> min(1, 2)
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1
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>>> _min(1, 2)
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1
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>>> min([1, 2])
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1
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>>> _min([1, 2])
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1
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>>> min(1)
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: 'int' object is not iterable
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>>> _min(1)
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: 'int' object is not iterable
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>>> min([1])
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1
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>>> _min([1])
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1
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>>> min()
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: min expected 1 arguments, got 0
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>>> _min()
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: min expected 1 arguments, got 0
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>>> min([])
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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ValueError: min() arg is an empty sequence
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>>> _min([])
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"""
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if len(args) == 1 and not args[0]:
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return None
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return min(*args)
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def _max(*args):
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""" Same as stdlib max but returns None instead of exception
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in case of empty sequence.
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>>> max(1, 2)
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2
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>>> _max(1, 2)
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2
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>>> max([1, 2])
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2
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>>> _max([1, 2])
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2
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>>> max(1)
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: 'int' object is not iterable
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>>> _max(1)
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: 'int' object is not iterable
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>>> max([1])
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1
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>>> _max([1])
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1
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>>> max()
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: max expected 1 arguments, got 0
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>>> _max()
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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TypeError: max expected 1 arguments, got 0
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>>> max([])
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Traceback (most recent call last):
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File "<stdin>", line 1, in ?
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ValueError: max() arg is an empty sequence
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>>> _max([])
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"""
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if len(args) == 1 and not args[0]:
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return None
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return max(*args)
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if __name__ == "__main__":
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import doctest
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doctest.testmod()
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