非函数 ：python遍历两个日期之间的时间

import datetime

end = '2016-06-01'
start = '2019-07-12'

datestart = datetime.datetime.strptime(start, '%Y-%m-%d')
dateend = datetime.datetime.strptime(end, '%Y-%m-%d')

while datestart > dateend:
    datestart -= datetime.timedelta(days=1)
    print (datestart.strftime('%Y%m%d'))
    url_time = datestart.strftime('%Y%m%d')
    print(type(url_time))

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函数方式

date_sq_list = []
def sqday(begin_date, end_date):
    begin_date = datetime.datetime.strptime(begin_date, "%Y-%m-%d")
    end_date = datetime.datetime.strptime(end_date, "%Y-%m-%d")
    while begin_date <= end_date:
        date_str = begin_date.strftime("%Y-%m-%d")
        date_sq_list.append(date_str)
        begin_date += datetime.timedelta(days=1)
    return date_sq_list

# print(sqday('1985-01-01', '2019-07-21'))
# print(date_sq_list,type(date_sq_list[0]))

时间减去一年、一个月

#pip install python-dateutil
import datetime
import dateutil.relativedelta
# 时间减去一个月
def date_minus_month(gk_date):
    d = datetime.datetime.strptime(gk_date, "%Y-%m-%d")  # 2013-02-28 00:00:00
    date_mm = d - dateutil.relativedelta.relativedelta(months=1)
    date_mm = datetime.datetime.strftime(date_mm, "%Y-%m-%d")
    return date_mm

# 时间减去一年
def date_minus_year(gk_date):
    d = datetime.datetime.strptime(gk_date, "%Y-%m-%d")  # 2013-02-28 00:00:00
    date_mm = d - dateutil.relativedelta.relativedelta(years=2)
    date_mm = datetime.datetime.strftime(date_mm, "%Y-%m-%d")
    print(date_mm)
    return date_mm