Python - 如何沿行连接两个或多个 Pandas DataFrame？
要连接两个以上的PandasDataFrame，请使用concat()方法。将轴参数设置为轴=0以沿行连接。首先，导入所需的库-
import pandas as pd
让我们创造1日数据框-
dataFrame1 = pd.DataFrame(
{
"Col1": [10, 20, 30],"Col2": [40, 50, 60],"Col3": [70, 80, 90],
},
index=[0, 1, 2],
)让我们创建第二个DataFrame-
dataFrame2 = pd.DataFrame(
{
"Col1": [100, 110, 120],"Col2": [130, 140, 150],"Col3": [160, 170, 180],
},
index=[3, 4, 5],
)让我们创建第三个DataFrame-
dataFrame3 = pd.DataFrame(
{
"Col1": [200, 210, 220],"Col2": [230, 240, 250],"Col3": [260, 270, 280],
},
index=[6, 7, 8],
)使用连接所有3个数据帧concat()。设置“axis=1”以沿行连接-
res = [dataFrame1, dataFrame2, dataFrame3] pd.concat(res, axis=1))
示例
以下是代码-
import pandas as pd
#创建DataFrame1
dataFrame1 = pd.DataFrame(
{
"Col1": [10, 20, 30],"Col2": [40, 50, 60],"Col3": [70, 80, 90],
},
index=[0, 1, 2],
)
#数据帧1
print"DataFrame1...\n",dataFrame1
#创建DataFrame2
dataFrame2 = pd.DataFrame(
{
"Col1": [100, 110, 120],"Col2": [130, 140, 150],"Col3": [160, 170, 180],
},
index=[3, 4, 5],
)
#数据帧2
print"DataFrame2...\n",dataFrame2
dataFrame3 = pd.DataFrame(
{
"Col1": [200, 210, 220],"Col2": [230, 240, 250],"Col3": [260, 270, 280],
},
index=[6, 7, 8],
)
#数据帧3
print"DataFrame3...\n",dataFrame3
#连接2个以上的数据帧
# set "axis=0" for concatenation along rows
res = [dataFrame1, dataFrame2, dataFrame3]
print"\n Concatenating all the 3 DataFrames (along rows)...\n", pd.concat(res, axis=0)输出结果这将产生以下输出-
DataFrame1... Col1 Col2 Col3 0 10 40 70 1 20 50 80 2 30 60 90 DataFrame2... Col1 Col2 Col3 3 100 130 160 4 110 140 170 5 120 150 180 DataFrame3... Col1 Col2 Col3 6 200 230 260 7 210 240 270 8 220 250 280 Concatenating all the 3 DataFrames (along rows)... Col1 Col2 Col3 0 10 40 70 1 20 50 80 2 30 60 90 3 100 130 160 4 110 140 170 5 120 150 180 6 200 230 260 7 210 240 270 8 220 250 280