[英]How to read one column data as one by one row in csv file using python
[英]how to write three csv file data into one csv file with one date column and three data column using python
我有三个带有日期一输入值的 csv 文件。 我只想将这三个 csv 文件合并为一个 csv 文件,其中包含一个日期列和三个输入数据。
date X1 2018-06-08 09:30:00 450 2018-06-08 10:30:00 340.0 2018-06-08 11:30:00 200.5 2018-06-08 12:30:00 100.75 2018-06-08 13:30:00 80.875 2018-06-08 14:30:00 50.4375 2018-06-08 15:30:00 450.71875 2018-06-08 16:30:00 300.859375 2018-06-08 17:30:00 150.4296875 2018-06-08 18:30:00 40.21484375 2018-06-08 19:30:00 47.607421875 2018-06-08 20:30:00 23.8037109375 second csv date X2 2018-06-08 09:25:00 300 2018-06-08 10:25:00 250.0 2018-06-08 11:25:00 170.0 2018-06-08 12:25:00 80.5 2018-06-08 13:25:00 65.25 2018-06-08 14:25:00 55.625 2018-06-08 15:25:00 40.8125 2018-06-08 16:25:00 20.90625 2018-06-08 17:25:00 10.953125 2018-06-08 18:25:00 8.9765625 third csv date X3 2018-06-08 15:00:00 3 2018-06-08 16:00:00 2.5.0 2018-06-08 17:00:00 0.5 2018-06-08 18:00:00 0.35 2018-06-08 19:00:00 0.25 2018-06-08 20:00:00 0.15 2018-06-08 21:00:00 0.03125 2018-06-08 22:00:00 0.015625 2018-06-08 23:00:00 0.0078125 2018-06-09 00:00:00 0.00390625
这是我的三个 csv 文件:
我的预期是:
date X1 X2 X3 2018-06-08 09:25:00 450 NaN NaN 2018-06-08 09:30:00 NaN 300 NaN 2018-06-08 10:25:00 NaN 250 NaN 2018-06-08 10:30:00 340 NaN NaN 2018-06-08 11:25:00 NaN 170 NaN 2018-06-08 11:30:00 200.5 NaN NaN 2018-06-08 12:25:00 80.5 NaN NaN 2018-06-08 12:30:00 100.75 NaN NaN 2018-06-08 13:25:00 NaN 65.5 NaN 2018-06-08 13:30:00 80.875 NaN NaN 2018-06-08 14:25:00 NaN 55.625 NaN 2018-06-08 14:30:00 50.4375 NaN NaN 2018-06-08 15:00:00 NaN NaN 3
在这里我写了一个代码,但它没有给我我期望的 output。 我的代码:
df1= pd.read_csv('X1.csv')
df2=pd.read_csv('X2'.csv')
df3=pd.read_csv('X3'.csv')
df = pd.concat([df1,df2,df3])
谁能帮我解决这个问题?
尝试这个:
df=df1.merge(df2, how='outer').merge(df3, how='outer')
创建DatetimeIndex
然后使用concat
与axis=1
:
df1=pd.read_csv('X1.csv', parse_dates=['date'], index_col=['date'])
df2=pd.read_csv('X2.csv', parse_dates=['date'], index_col=['date'])
df3=pd.read_csv('X3.csv', parse_dates=['date'], index_col=['date'])
df = pd.concat([df1,df2,df3], axis=1)
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