Python Pandas - 如何从 DataFrame 中选择多行
要从 DataFrame 中选择多行,请使用 : 运算符设置范围。首先,使用别名导入 require pandas 库 -
import pandas as pd
现在,创建一个新的 Pandas DataFrame -
dataFrame = pd.DataFrame([[10, 15], [20, 25], [30, 35], [40, 45]],index=['w', 'x', 'y', 'z'],columns=['a', 'b'])
使用 : 操作符选择多行 -
dataFrame[0:2]
示例
以下是代码 -
import pandas as pd输出结果# Create DataFrame
dataFrame = pd.DataFrame([[10, 15], [20, 25], [30, 35], [40, 45]],index=['w', 'x', 'y', 'z'],columns=['a', 'b'])
# DataFrame
print"DataFrame...\n",dataFrame
# select rows with loc
print"\nSelect rows by passing label..."
print(dataFrame.loc['z'])
# select rows with integer location using iloc
print"\nSelect rows by passing integer location..."
print(dataFrame.iloc[1])
# selecting multiple rows
print"\nSelect multiple rows..."
print(dataFrame[0:2])
这将产生以下输出 -
DataFrame...a b
w 10 15
x 20 25
y 30 35
z 40 45
Select rows by passing label...
a 40
b 45
Name: z, dtype: int64
Select rows by passing integer location...
a 20
b 25
Name: x, dtype: int64
Select multiple rows...
a b
w 10 15
x 20 25
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