Append row to empty pandas DataFrame

Question

I'm trying to create an empty pandas DataFrame with the columns ['ImageName','faces','ImageWidth', 'ImageHeight'] to which I'm trying to append a row. Let's take the following row as an example: ['selfie_10.png',3,200,300].

So far, I've come up with the following code snippet. But either it doesn't work or it throws an error.

import pandas as pd

columns = ['ImageName','faces','ImageWidth', 'ImageHeight']

df = pd.DataFrame(columns=columns)

for i in range(0,10):
    row = ['selfie_10.png',3,200,300]
    df.append(row,ignore_index=True)
 
print(df)

The output is unfortunately an empty array.

In [72]:runfile('/Users/add_row.py', wdir='/Users/Desktop/faces')
Empty DataFrame
Columns: [ImageName, faces, ImageWidth, ImageHeight]
Index: []

Can anybody help me?

try df.loc[i] = row in the for loop instead of appending.

Mustafa Aydın
– Mustafa Aydın

2021-02-28 09:19:02 +00:00
Commented Feb 28, 2021 at 9:19 — Mustafa Aydın
– Mustafa Aydın, Commented Feb 28, 2021 at 9:19

Mujeeb Ur Rehman · Accepted Answer · 2021-02-28 09:29:45Z

2

First of all, create a list and append all the rows into that list then convert that list into a DataFrame.

import pandas as pd
columns = ['ImageName','faces','ImageWidth', 'ImageHeight']
a = []
for i in range(0,10):
    row = ['selfie_10.png',3,200,300]
    a.append(row)
df = pd.DataFrame(a,columns=columns)

answered Feb 28, 2021 at 9:29

Mujeeb Ur Rehman

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Bruno Eigenmann · Accepted Answer · 2021-02-28 09:29:08Z

1

Thanks to @MustafyAydin I've come up with this solution.

columns = ['ImageName','faces','ImageWidth', 'ImageHeight']

df = pd.DataFrame(columns=columns)
print(df.shape)

for i in range(0,10):
    row = ['selfie_10.png',3,200,300]
    index = df.shape[0] + 1
    df.loc[index] = row
 
print(df)

answered Feb 28, 2021 at 9:29

Bruno Eigenmann

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