How to replace negative numbers in Pandas Data Frame by zero

Question

I would like to know if there is someway of replacing all DataFrame negative numbers by zeros?

Answer 1

If you are dealing with a large df (40m x 700 in my case) it works much faster and memory savvy through iteration on columns with something like.

for col in df.columns:
    df[col][df[col] < 0] = 0