生成日期列表

import pandas as pd
from datetime import datetime
def datelist(beginDate, endDate):
    # beginDate, endDate是形如‘20160601’的字符串或datetime格式
    date_l=[datetime.strftime(x,'%Y-%m') for x in list(pd.date_range(start=beginDate, end=endDate))]
    date_set=list(set(date_l))
    date_set.sort(key=date_l.index)
    return date_set


输出：
['2009-06', '2009-07', '2009-08', '2009-09', '2009-10', '2009-11']