Python中的按日期分组和特定值计数

import datetime
from collections import Counter

data = [
    {'date': '2022-01-01', 'value': 'A'},
    {'date': '2022-01-01', 'value': 'B'},
    {'date': '2022-01-02', 'value': 'A'},
    {'date': '2022-01-02', 'value': 'C'},
    {'date': '2022-01-03', 'value': 'B'},
    {'date': '2022-01-03', 'value': 'C'},
    {'date': '2022-01-03', 'value': 'C'}
]

grouped_data = {}
for item in data:
    date = datetime.datetime.strptime(item['date'], '%Y-%m-%d').date()
    if date in grouped_data:
        grouped_data[date].append(item['value'])
    else:
        grouped_data[date] = [item['value']]

counted_data = {}
for date, values in grouped_data.items():
    counted_data[date] = dict(Counter(values))

for date, counts in counted_data.items():
    print(f"Date: {date}")
    for value, count in counts.items():
        print(f"Value: {value}, Count: {count}")