Question

我的df1索引df1.index.shape为(80,)。我有一个numpy数组df2，df2.shape (80,2)。但是，当我尝试将df2转换为数据框df2 = pd.DataFrame(df2,index=df1.index)时，我收到以下错误消息：

ValueError：传递值的形状为（80,2），index islyly（80,80）

为什么我收到此错误？任何帮助表示赞赏。

Answer 1

对我来说它很好用：

import pandas as pd


df1 = pd.DataFrame({'A':[1,2,3],
                    'B':[4,5,6]}, index=['a','b','c'])

print (df1)
   A  B
a  1  4
b  2  5
c  3  6

print (df1.index.shape)
(3,)

df2 = df1.values
print (df2)
[[1 4]
 [2 5]
 [3 6]]

print (df2.shape)
(3, 2)

print (pd.DataFrame(df2,index=df1.index))
   0  1
a  1  4
b  2  5
c  3  6

但如果将index更改为columns，则会引发错误：

print (pd.DataFrame(df2,columns=df1.index))
ValueError: Shape of passed values is (2, 3), indices imply (3, 3)

如果index的长度不同，则会引发错误：

import pandas as pd


df1 = pd.DataFrame({'A':[1,2],
                    'B':[3,4],
                    'C':[5,6]}, index=['a','b'])

print (df1)
   A  B  C
a  1  3  5
b  2  4  6

idx = pd.Index([5,6,7])
print (idx)
Int64Index([5, 6, 7], dtype='int64')

print (idx.shape)
(3,)

df2 = df1.values
print (df2)
[[1 3 5]
 [2 4 6]]

print (df2.shape)
(2, 3)

print (pd.DataFrame(df2,index=idx))
ValueError: Shape of passed values is (3, 2), indices imply (3, 3)

Answer 2

请提供示例数据集，因为一切都在这个简单的例子中起作用：

public void button1_Click(object sender, EventArgs e)
{
    this.TopMost = true;
    DialogResult result1 = MessageBox.Show("Add some notes to your current ticket?",
    "Add Notes",
    MessageBoxButtons.YesNo);


    if (result1 == DialogResult.Yes)
    {
        Timer tm;
        tm = new Timer();

        int minutes = int.Parse(textBox2.Text);
        tm.Interval = (int)TimeSpan.FromMinutes(minutes).TotalMilliseconds;

        tm.Tick += new EventHandler(button1_Click);

        tm.Enabled = true;

        string pastebuffer = DateTime.Now.ToString();
        pastebuffer = "### Edited on " + pastebuffer + " by " + txtUsername.Text + " ###";
        Clipboard.SetText(pastebuffer);

        tm.Start();

    }

    else if (result1 == DialogResult.No)
    { 

    }

    this.TopMost = false;
}

将指数从一个df应用到另一个df

2 个答案: