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Insert Columns into a Pandas DataFrame

Explore methods to insert columns into pandas DataFrames correctly. Understand why using square bracket notation is preferred over attribute access to avoid confusion and errors. Learn how to manage DataFrame metadata efficiently while practicing safe column addition techniques.

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Try it yourself

...
Python 3.8
import pandas as pd
df = pd.DataFrame([
  ['Sterling', 83.4],
  ['Cheryl', 97.2],
  ['Lana', 13.2],
], columns=['name', 'sum'])
df.late_fee = 3.5
print(df)
...