DOC: Add custom index to example in pandas.DataFrame.append pandas-dev#41407

Change index to [0, 2] to stress that ignore_index=True resets the index of both dataframes

Author: t0asty

pandas/core/frame.py

@@ -8811,18 +8811,18 @@ def append(
 
         Examples
         --------
-        >>> df = pd.DataFrame([[1, 2], [3, 4]], columns=list('AB'))
+        >>> df = pd.DataFrame([[1, 2], [3, 4]], columns=list('AB'), index=[0,2])
         >>> df
            A  B
         0  1  2
-        1  3  4
-        >>> df2 = pd.DataFrame([[5, 6], [7, 8]], columns=list('AB'))
+        2  3  4
+        >>> df2 = pd.DataFrame([[5, 6], [7, 8]], columns=list('AB'), index=[0,2])
         >>> df.append(df2)
            A  B
         0  1  2
-        1  3  4
+        2  3  4
         0  5  6
-        1  7  8
+        2  7  8
 
         With `ignore_index` set to True: