AttributeError: DataFrame Has No Attribute 'append'

Why This Happens

In pandas 2.0, several deprecated methods were removed including DataFrame.append(). The recommended replacement is pd.concat(), which is more explicit and efficient for combining DataFrames.

The Problem

import pandas as pd
df = pd.DataFrame({'a': [1]})
df = df.append({'a': 2}, ignore_index=True)

The Fix

import pandas as pd
df = pd.DataFrame({'a': [1]})
new_row = pd.DataFrame({'a': [2]})
df = pd.concat([df, new_row], ignore_index=True)

Step-by-Step Fix

1. 1

   Use pd.concat()

   Replace df.append(row) with pd.concat([df, pd.DataFrame([row])]).

2. 2

   Check pandas version

   Run pd.__version__ to check your pandas version.

3. 3

   Review migration guide

   Check the pandas 2.0 migration guide for other removed methods.