Handling division by zero in Pandas calculations

Question

I have the following data:

a = pd.Series([1, 2, 3])
b = pd.Series([0, 0, 0])

If there is a division by zero I want to in some cases

Answer 1

I think you can use Series.replace:

print (a.div(b.replace(0, np.nan)).fillna(0))
0    0.0
1    0.0
2    0.0
dtype: float64

print (a.div(b.replace(0, np.nan)).fillna(a))
0    1.0
1    2.0
2    3.0
dtype: float64