Replace value for a selected cell in pandas DataFrame without using index

Question

this is a rather similar question to this question but with one key difference: I\'m selecting the data I want to change not by its index but by some criteria.

If th

Answer 1

Old question, but I'm surprised nobody mentioned numpy's .where() functionality (which can be called directly from the pandas module).

In this case the code would be:

d.sales = pd.np.where(d.sales == 24, 100, d.sales)

To my knowledge, this is one of the fastest ways to conditionally change data across a series.