Python -获取每周、每月、季度、六个月、一年等的第一次和最后一次观察

Python中可以使用datetime模块来获取每周、每月、季度、六个月、一年等的第一次和最后一次观察的日期。

获取每周的第一天和最后一天：

import datetime

today = datetime.date.today()
start_of_week = today - datetime.timedelta(days=today.weekday())
end_of_week = start_of_week + datetime.timedelta(days=6)

print("本周第一天：", start_of_week)
print("本周最后一天：", end_of_week)

获取每月的第一天和最后一天：

import datetime

today = datetime.date.today()
start_of_month = datetime.date(today.year, today.month, 1)
end_of_month = datetime.date(today.year, today.month+1, 1) - datetime.timedelta(days=1)

print("本月第一天：", start_of_month)
print("本月最后一天：", end_of_month)

获取每个季度的第一天和最后一天：

import datetime

today = datetime.date.today()
quarter = (today.month - 1) // 3 + 1
start_of_quarter = datetime.date(today.year, 3 * quarter - 2, 1)
end_of_quarter = datetime.date(today.year, 3 * quarter, 1) - datetime.timedelta(days=1)

print("本季度第一天：", start_of_quarter)
print("本季度最后一天：", end_of_quarter)

获取六个月的第一天和最后一天：

import datetime

today = datetime.date.today()
start_of_six_months = datetime.date(today.year, today.month - 5, 1)
end_of_six_months = datetime.date(today.year, today.month + 1, 1) - datetime.timedelta(days=1)

print("过去六个月第一天：", start_of_six_months)
print("过去六个月最后一天：", end_of_six_months)

获取一年的第一天和最后一天：

import datetime

today = datetime.date.today()
start_of_year = datetime.date(today.year, 1, 1)
end_of_year = datetime.date(today.year, 12, 31)

print("本年第一天：", start_of_year)
print("本年最后一天：", end_of_year)

以上代码可以根据当前日期动态计算出相应的日期范围。对于更复杂的日期计算，可以使用datetime模块提供的各种方法和属性进行处理。

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