如何使用熊猫显示特定年份的星期几？
给定日期和年份。任务是显示一年中一周的所有日子。可以使用pandas . date _ range()功能找到。该函数用于获取固定频率的日期时间索引。
*语法:*pandas . date _ range(start = None，end=None，periods=None，freq=None，tz=None，normalize=False，name=None，closed=None，kwargs)**
*进场:*
- 进口熊猫模块
- 创建用于计算时间序列的参数函数。
- 使用 pandas.date_range()函数生成固定频率的日期序列
- 存储到熊猫系列内的功能
- 并返回全天的日期
*下面是实现。*
**## Python 3
# importing module
import pandas as pd
# User define function
def Time_series(day, yy):
date_range = pd.date_range(yy+'-01-01', periods=52, freq=day)
result = pd.Series(date_range)
print(f"All { day[2:] } in " + yy + ":")
print(result)
# Input from user
day = "wed"
yy = "2020"
# Check the day form input variable
if day == 'monday' or day == 'mon':
Time_series('W-mon', yy)
elif day == 'tuesday' or day == 'tue':
Time_series('W-tue', yy)
elif day == 'wednesday' or day == 'wed':
Time_series('W-wed', yy)
elif day == 'thursday' or day == 'thu':
Time_series('W-thu', yy)
elif day == 'friday' or day == 'fri':
Time_series('W-fri', yy)
elif day == 'saturday' or day == 'sat':
Time_series('W-fri', yy)
else:
Time_series('W-sun', yy)
```**
****输出:****
```py
All wed in 2020:
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]
*注意:*周期 52 因为一年的总天数是 365，那么每天会重复 52 次(365/7=52)。
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