早上好,
我在使用isin((函数时遇到了一个小问题。我目前正在处理这个代码:
import pandas as pd
da = pd.DataFrame()
da['Date'] = ["29/07/2021", "29/07/2021", "30/07/2021", "30/07/2021", "31/07/2021", "31/07/2021", "01/08/2021", "01/08/2021", "02/08/2021"]
da['Time'] = ["06:48:00", "06:59:00", "07:14:00", "08:12:00", "08:42:00", "08:57:00", "05:45:00", "05:55:00", "06:05:00"]
da['DateTime'] = pd.to_datetime(da.pop('Date')) + pd.to_timedelta(da.pop('Time'))
da['DateTime'] = da['DateTime'].dt.strftime('%Y-%m-%d %H:%M')
print(da.head())
df = pd.DataFrame()
df['Date'] = ["29/07/2021", "29/07/2021", "29/07/2021", "29/07/2021", "30/07/2021", "30/07/2021", "30/07/2021", "30/07/2021", "31/07/2021", "31/07/2021", "01/08/2021", "01/08/2021", "02/08/2021"]
df['Time'] = ["06:48:00", "06:53:00", "06:56:00", "06:59:00", "07:14:00", "07:18:00", "07:40:00", "08:12:00", "08:42:00", "08:57:00", "05:45:00", "05:55:00", "06:05:00"]
df["Column1"] = [0.011534891, 0.013458399, 0.017792937, 0.018807581, 0.025931434, 0.025163517, 0.026561283, 0.027743659, 0.028854, 0.000383506, 0.000543031, 0.000342, 0.000313769]
df["Column2"] = [8.4021, 8.4421, 8.4993, 8.545, 8.3627, 8.5518, 8.6266, 8.6455, 8.485, 8.545, 8.415, 8.475, 8.505]
df["Column3"] = [0.000270475, 0.000313769, 0.000383506, 0.000414331, 0.000533619, 0.000505081, 0.000533131, 0.000543031, 0.000342, 0.011534891, 0.013458399, 0.025931434, 0.025163517]
df['DateTime'] = pd.to_datetime(df.pop('Date')) + pd.to_timedelta(df.pop('Time'))
df['DateTime'] = df['DateTime'].dt.strftime('%Y-%m-%d %H:%M')
print(df.head)
filter1 = da['DateTime'].isin(df['DateTime'])
print(df.loc[filter1].head(10000))
我正在尝试查看da数据帧中的日期时间是否存在于df的数据帧中,如果存在,我想获取column1、column2和column3的值,并将它们与 da感谢您抽出时间,祝您度过美好的一天!
无需检查任何内容,只需直接执行左merge
:
da.merge(df, on='DateTime', how='left')
输出:
DateTime Column1 Column2 Column3
0 2021-07-29 06:48 0.011535 8.4021 0.000270
1 2021-07-29 06:59 0.018808 8.5450 0.000414
2 2021-07-30 07:14 0.025931 8.3627 0.000534
3 2021-07-30 08:12 0.027744 8.6455 0.000543
4 2021-07-31 08:42 0.028854 8.4850 0.000342
5 2021-07-31 08:57 0.000384 8.5450 0.011535
6 2021-01-08 05:45 0.000543 8.4150 0.013458
7 2021-01-08 05:55 0.000342 8.4750 0.025931
8 2021-02-08 06:05 0.000314 8.5050 0.025164