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使用 Python 中的熊猫显示给定年份的所有周日

原文:https://www.geeksforgeeks.org/display-特定年份的所有星期天都在使用蟒蛇皮熊猫/

让我们看看如何使用熊猫显示一年中的所有星期天。我们将使用Pandas模块的[date_range()](https://www.geeksforgeeks.org/python-pandas-date_range-method/)功能。

算法:

  1. 导入pandas模块。
  2. 使用date_range()功能获取所有周日,参数为:
    • 为了显示 2020 年的星期日,start参数设置为 2020-01-01。
    • 参数periods设置为 52,因为一年大约有 52 周。
    • 参数freq设置为 W-SUN,其中 W 指每周,SUN 指周日。
  3. 打印取出的DateTimeIndex对象。
# importing the module
import pandas as pd

# target year
year = "2020"

# instantiating the parameters
start = year + "-01-01"
periods = 52
freq = "W-SUN"

# fetching the Sundays
sundays = pd.date_range(start = start,
                        periods = periods,
                        freq = freq)

# printing the Sundays                        
print(sundays)

输出:

日期时间索引(“2020-01-05”、“2020-01-12”、“2020-01-19”、“2020-01-26”、“2020-02-02”、“2020-02-09”、“2020-02-16”、“2020-02-23”、“2020-t1”、“2020-03-01”、“2020-03-08”、“2020-03-15”、“2020-03-22”、“2020-03-29”、“2020-04-05”、“2020-04-12”)

如果我们想取周日以外的任何一天,我们可以通过将参数freq更改为所需的日期来调整上述程序。

# importing the module
import pandas as pd

# target year
year = "2020"

# day to be fetched
day = "MON"

# instantiating the parameters
start = year + "-01-01"
periods = 52
freq = "W-" + day

# fetching the days
days = pd.date_range(start = start,
                     periods = periods,
                     freq = freq)

# printing the days                        
print(days)

输出:

日期时间索引(['2020-01-06 ',' 2020-01-13 ',' 2020-01-20 ',' 2020-01-27 ',' t0 ' 2020-02-03 ',' 2020-02-10 ',' 2020-02-17 ',' 2020-02-24 ',' T1 ',' 2020-03-02 ',' 2020-03-09 ',' 2020-03-16 ',' 2020-03-23 ',' 2020-30 ',' 2020-04-06 ',' 2020-04-13 ','

我们可以将DateTimeIndex对象转换为 Series 对象,以获得要提取的日期列表。

# importing the module
import pandas as pd

# target year
year = "2020"

# day to be fetched
day = "WED"

# instantiating the parameters
start = year + "-01-01"
periods = 52
freq = "W-" + day

# fetching the days
days = pd.Series(pd.date_range(start = start,
                               periods = periods,
                               freq = freq))

# printing the days                        
print(days)

输出:

0    2020-01-01
1    2020-01-08
2    2020-01-15
3    2020-01-22
4    2020-01-29
5    2020-02-05
6    2020-02-12
7    2020-02-19
8    2020-02-26
9    2020-03-04
10   2020-03-11
11   2020-03-18
12   2020-03-25
13   2020-04-01
14   2020-04-08
15   2020-04-15
16   2020-04-22
17   2020-04-29
18   2020-05-06
19   2020-05-13
20   2020-05-20
21   2020-05-27
22   2020-06-03
23   2020-06-10
24   2020-06-17
25   2020-06-24
26   2020-07-01
27   2020-07-08
28   2020-07-15
29   2020-07-22
30   2020-07-29
31   2020-08-05
32   2020-08-12
33   2020-08-19
34   2020-08-26
35   2020-09-02
36   2020-09-09
37   2020-09-16
38   2020-09-23
39   2020-09-30
40   2020-10-07
41   2020-10-14
42   2020-10-21
43   2020-10-28
44   2020-11-04
45   2020-11-11
46   2020-11-18
47   2020-11-25
48   2020-12-02
49   2020-12-09
50   2020-12-16
51   2020-12-23
dtype: datetime64[ns]


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