如何在月度交替时按月分组

import datetime

# 示例日期数据
dates = [
    '2022-01-05',
    '2022-01-15',
    '2022-02-10',
    '2022-02-20',
    '2022-03-08',
    '2022-03-18',
]

# 将日期数据转换为月份
months = [datetime.datetime.strptime(date, '%Y-%m-%d').strftime('%Y-%m') for date in dates]

# 对月份进行分组
grouped_months = {}
for month in months:
    if month in grouped_months:
        grouped_months[month] += 1
    else:
        grouped_months[month] = 1

# 打印每个月份的数量
for month, count in grouped_months.items():
    print(f'{month}: {count}')

2022-01: 2
2022-02: 2
2022-03: 2