通過?pandas.date_range命令檢視date_range函式幫助文件

語法：pandas.date_range(start=None, end=None, periods=None, freq='D', tz=None, normalize=False, name=None, closed=None, **kwargs)

該函式主要用於生成一個固定頻率的時間索引，在呼叫構造方法時，必須指定start、end、periods中的兩個引數值，否則報錯。

主要引數說明：

periods：固定時期，取值為整數或None

freq：日期偏移量，取值為string或DateOffset，預設為'D'

normalize：若引數為True表示將start、end引數值正則化到午夜時間戳

name：生成時間索引物件的名稱，取值為string或None

closed：可以理解成在closed=None情況下返回的結果中，若closed=‘left’表示在返回的結果基礎上，再取左開右閉的結果，若closed='right'表示在返回的結果基礎上，再取做閉右開的結果

In [11]: import pandas as pd

In [12]: pd.date_range(start='20170101',end='20170110')
Out[12]:
DatetimeIndex(['2017-01-01', '2017-01-02', '2017-01-03', '2017-01-04',
               '2017-01-05', '2017-01-06', '2017-01-07', '2017-01-08',
               '2017-01-09', '2017-01-10'],
              dtype='datetime64[ns]', freq='D')

In [13]: pd.date_range(start='20170101',periods=10)
Out[13]:
DatetimeIndex(['2017-01-01', '2017-01-02', '2017-01-03', '2017-01-04',
               '2017-01-05', '2017-01-06', '2017-01-07', '2017-01-08',
               '2017-01-09', '2017-01-10'],
              dtype='datetime64[ns]', freq='D')

In [14]: pd.date_range(start='20170101',periods=10,freq='1D')
Out[14]:
DatetimeIndex(['2017-01-01', '2017-01-02', '2017-01-03', '2017-01-04',
               '2017-01-05', '2017-01-06', '2017-01-07', '2017-01-08',
               '2017-01-09', '2017-01-10'],
              dtype='datetime64[ns]', freq='D')

In [15]: pd.date_range(start='20170101',end='20170110',freq='3D',name='dt')
Out[15]: DatetimeIndex(['2017-01-01', '2017-01-04', '2017-01-07', '2017-01-10'],
 dtype='datetime64[ns]', name='dt', freq='3D')

In [16]: pd.date_range(start='2017-01-01 08:10:50',periods=10,freq='s',normaliz
    ...: e=True)
Out[16]:
DatetimeIndex(['2017-01-01 00:00:00', '2017-01-01 00:00:01',
               '2017-01-01 00:00:02', '2017-01-01 00:00:03',
               '2017-01-01 00:00:04', '2017-01-01 00:00:05',
               '2017-01-01 00:00:06', '2017-01-01 00:00:07',
               '2017-01-01 00:00:08', '2017-01-01 00:00:09'],
              dtype='datetime64[ns]', freq='S')

In [17]: pd.date_range(start='2017-01-01 08:10:50',end='2017-01-02 09:20:40',fr
    ...: eq='s',normalize=True)
Out[17]:
DatetimeIndex(['2017-01-01 00:00:00', '2017-01-01 00:00:01',
               '2017-01-01 00:00:02', '2017-01-01 00:00:03',
               '2017-01-01 00:00:04', '2017-01-01 00:00:05',
               '2017-01-01 00:00:06', '2017-01-01 00:00:07',
               '2017-01-01 00:00:08', '2017-01-01 00:00:09',
               ...
               '2017-01-01 23:59:51', '2017-01-01 23:59:52',
               '2017-01-01 23:59:53', '2017-01-01 23:59:54',
               '2017-01-01 23:59:55', '2017-01-01 23:59:56',
               '2017-01-01 23:59:57', '2017-01-01 23:59:58',
               '2017-01-01 23:59:59', '2017-01-02 00:00:00'],
              dtype='datetime64[ns]', length=86401, freq='S')

In [18]: pd.date_range(start='2017-01-01 08:10:50',periods=15,freq='s',normaliz
    ...: e=False)
Out[18]:
DatetimeIndex(['2017-01-01 08:10:50', '2017-01-01 08:10:51',
               '2017-01-01 08:10:52', '2017-01-01 08:10:53',
               '2017-01-01 08:10:54', '2017-01-01 08:10:55',
               '2017-01-01 08:10:56', '2017-01-01 08:10:57',
               '2017-01-01 08:10:58', '2017-01-01 08:10:59',
               '2017-01-01 08:11:00', '2017-01-01 08:11:01',
               '2017-01-01 08:11:02', '2017-01-01 08:11:03',
               '2017-01-01 08:11:04'],
              dtype='datetime64[ns]', freq='S')

In [19]: pd.date_range(start='20170101',end='20170110',freq='3D',closed='left')
    ...:
Out[19]: DatetimeIndex(['2017-01-01', '2017-01-04', '2017-01-07'], dtype='dateti
me64[ns]', freq='3D')

In [20]: pd.date_range(start='20170101',end='20170110',freq='3D',closed='right'
    ...: )
Out[20]: DatetimeIndex(['2017-01-04', '2017-01-07', '2017-01-10'], dtype='dateti
me64[ns]', freq='3D')