python - 计算工作天数，即计算 python 列表中的项目

Question

我有一份在一天中不同时间工作的员工名单，我想计算每个人工作的天数，如下所示:

FOO:3巴兹:3NOM:1 等......

这是我接收原始数据的方式:

my_list = [('NOM', datetime.date(2030, 1, 1)),
 ('BAR', datetime.date(2019, 4, 8)),
 ('HAM', datetime.date(2019, 4, 8)),
 ('FOO', datetime.date(2019, 4, 8)),
 ('BAZ', datetime.date(2019, 4, 8)),
 ('BAR', datetime.date(2019, 4, 10)),
 ('BAZ', datetime.date(2019, 4, 10)),
 ('FOO', datetime.date(2019, 4, 10)),
 ('HAM', datetime.date(2019, 4, 10)),
 ('HAM', datetime.date(2019, 4, 10)),
 ('FOO', datetime.date(2019, 4, 10)),
 ('BAR', datetime.date(2019, 4, 10)),
 ('BAZ', datetime.date(2019, 4, 10)),
 ('BAZ', datetime.date(2019, 4, 11)),
 ('HAM', datetime.date(2019, 4, 11)),
 ('BAR', datetime.date(2019, 4, 11)),
 ('FOO', datetime.date(2019, 4, 11)),
 ('BAZ', datetime.date(2019, 4, 11)),
 ('FOO', datetime.date(2019, 4, 11)),
 ('BAR', datetime.date(2019, 4, 11)),
 ('HAM', datetime.date(2019, 4, 11)),
 ('FOO', datetime.date(2019, 4, 11)),
 ('BAZ', datetime.date(2019, 4, 11)),
 ('BAR', datetime.date(2019, 4, 11)),
 ('HAM', datetime.date(2019, 4, 11)),
 ('FOO', datetime.date(2019, 4, 11)),
 ('BAZ', datetime.date(2019, 4, 11)),
 ('BAR', datetime.date(2019, 4, 11)),
 ('HAM', datetime.date(2019, 4, 11))]

我设法将列表剥离为每个人的唯一日期，如下所示: a = Counter(set(dictio)) 它在一天内为一个人去除了重复项:

Counter({('HAM', datetime.date(2019, 4, 8)): 1,
         ('HAM', datetime.date(2019, 4, 10)): 1,
         ('HAM', datetime.date(2019, 4, 11)): 1,
         ('BAR', datetime.date(2019, 4, 8)): 1,
         ('BAR', datetime.date(2019, 4, 10)): 1,
         ('BAR', datetime.date(2019, 4, 11)): 1,
         ('FOO', datetime.date(2019, 4, 8)): 1,
         ('FOO', datetime.date(2019, 4, 10)): 1,
         ('FOO', datetime.date(2019, 4, 11)): 1,
         ('BAZ', datetime.date(2019, 4, 8)): 1,
         ('BAZ', datetime.date(2019, 4, 10)): 1,
         ('BAZ', datetime.date(2019, 4, 11)): 1,
         ('NOM', datetime.date(2030, 1, 1)): 1})

这就是我卡住的地方:我从上面转到:

HAM:3
BAR:3
FOO:3
BAZ:3
NOM:1

Answer 1

你可以用

import collections
collections.Counter(x for x , y in set(my_list) )
Out[251]: Counter({'BAR': 3, 'BAZ': 3, 'FOO': 3, 'HAM': 3, 'NOM': 1})