append a dataframe with a new serie in python

To append a new series to an existing DataFrame in Pandas, you can use the append() method.

Here's an example code:

main.py
import pandas as pd

# create the initial DataFrame
df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})

# create the new series
new_series = pd.Series([7, 8, 9], name='C')

# append the new series to the existing DataFrame
df = df.append(new_series)

print(df)
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In this code, we first created an initial DataFrame df. Then, we created a new series new_series that we want to append to the DataFrame. We passed the new_series to the append() method of the DataFrame, and stored the result back in df. Finally, we printed df to verify that the new series has been successfully appended.