两个日期之间存在的所有月份的列表，包括日期之间的差值小于30天的情况

import datetime

def get_month_list(start_date, end_date):
    start_date = datetime.datetime.strptime(start_date, "%Y-%m-%d")
    end_date = datetime.datetime.strptime(end_date, "%Y-%m-%d")
    
    month_list = []
    num_months = (end_date.year - start_date.year) * 12 + (end_date.month - start_date.month)
    
    for i in range(num_months + 1):
        current_month = start_date + datetime.timedelta(days=30*i)
        if current_month < end_date:
            month_list.append(current_month.strftime("%Y-%m"))
    
    return month_list

# 示例用法
start_date = "2022-01-15"
end_date = "2022-04-15"
result = get_month_list(start_date, end_date)
print(result)

['2022-01', '2022-02', '2022-03', '2022-04']