Pandas- Dividing a column by another column conditional on if values are greater than 0?

Question

I have a pandas dataframe that contains dates, items, and 2 values. All I\'m looking to do is output another column that is the product of column A / column B if column B is

Answer 1

You get that using np.where

df['C'] = np.round(np.where(df['B'] > 0, df['A']/df['B'], 0), 1)

Or if you want to use loc

df.loc[df['B'] > 0, 'C'] = df['A']/df['B']

and then fillna(0)