用 Python 编写一个程序,将数据框索引正向和反向移动两个周期。
假设您有一个数据框,并将索引正向和反向移动两个周期,如下所示:
shift the index by three periods in positive direction Id Age 2020-01-01 00:00:00 NaN NaN 2020-01-01 12:00:00 NaN NaN 2020-01-02 00:00:00 1.0 10.0 2020-01-02 12:00:00 2.0 12.0 2020-01-03 00:00:00 3.0 14.0 shift the index by three periods in negative direction Id Age 2020-01-01 00:00:00 3.0 14.0 2020-01-01 12:00:00 4.0 11.0 2020-01-02 00:00:00 5.0 13.0 2020-01-02 12:00:00 NaN NaN 2020-01-03 00:00:00 NaN NaN
解决方案
为了解决这个问题,我们将按照以下步骤操作:
创建 Pandas 时间序列,起始时间为 '01-01-2020',周期数为 5,频率为 '12H'
定义一个数据框
应用 df.shift() 将索引正向移动两个周期,如下所示:
df.shift(2,axis=0)
应用 df.shift() 将索引反向移动两个周期,如下所示:
df.shift(-2,axis=0)
示例
让我们看看下面的代码以更好地理解:
import pandas as pd
time_series = pd.date_range('01-01-2020', periods = 5, freq ='12H')
df = pd.DataFrame({"Id":[1, 2, 3, 4, 5],
"Age":[10, 12, 14, 11, 13]},
index = time_series)
print("Dataframe is:\n",df)
print("shift the index by three periods in positive direction")
print(df.shift(2,axis=0))
print("shift the index by three periods in negative direction")
print(df.shift(-2,axis=0))输出
Dataframe is: Id Age 2020-01-01 00:00:00 1 10 2020-01-01 12:00:00 2 12 2020-01-02 00:00:00 3 14 2020-01-02 12:00:00 4 11 2020-01-03 00:00:00 5 13 shift the index by three periods in positive direction Id Age 2020-01-01 00:00:00 NaN NaN 2020-01-01 12:00:00 NaN NaN 2020-01-02 00:00:00 1.0 10.0 2020-01-02 12:00:00 2.0 12.0 2020-01-03 00:00:00 3.0 14.0 shift the index by three periods in negative direction Id Age 2020-01-01 00:00:00 3.0 14.0 2020-01-01 12:00:00 4.0 11.0 2020-01-02 00:00:00 5.0 13.0 2020-01-02 12:00:00 NaN NaN 2020-01-03 00:00:00 NaN NaN
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