[Python] Pandas- Dividing a column by another column conditional on if values are greater than...

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 greater than 0, and 0 if column B is equal to 0.

date item A B C
1/1/2017 a 0 3 0
1/1/2017 b 2 0 0
1/1/2017 c 5 2 2.5
1/1/2017 d 4 1 4
1/1/2017 e 3 3 1
1/1/2017 f 0 4 0
1/2/2017 a 3 3 1
1/2/2017 b 2 2 1
1/2/2017 c 3 9 0.333333333
1/2/2017 d 4 0 0
1/2/2017 e 5 3 1.666666667
1/2/2017 f 3 0 0


this is the code I've written, but the kernel keeps dying (keep in mind this is just an example table, I have about 30,000 rows so nothing too crazy)

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


any idea on what's going on? Is something running infinitely that's causing it to crash? Thanks for the help.

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