Append rows to a pandas DataFrame without making a new copy

Question

The pandas documentation includes a note:

Note Unlike list.append method, which appends to the original list and returns nothing, append here does not mod

Answer 1

See How to add an extra row to a pandas dataframe

Upcoming pandas 0.13 version will allow to add rows through loc on non existing index data.

Description is here and this new feature is called Setting With Enlargement.

Answer 2

Why not use concat?

df = pd.concat([df, pd.DataFrame(new_data)])