Question

Which of the following Python commands selects the first 3 rows of a DataFrame df, assuming that labelled index are consecutive integers starting from 0?

Options

• df.loc[:3]

• df.loc[:2]

• df.loc[0:4]

• df.loc[1:4]

Answer 1

df.loc[:2]

Explanation:

In pandas, .loc[] selects rows by label and includes the end label.
Since the index starts at 0, the first three rows have labels 0, 1, and 2.
So df.loc[:2] correctly selects these three rows (0, 1, and 2).