NaN-3.py

In [21]:
series_with_all_missing + series_with_2_missing

Out[21]:
0   NaN
1   NaN
2   NaN
3   NaN
dtype: float64

In [22]:
series_with_all_missing / series_with_2_missing

Out[22]:
0   NaN
1   NaN
2   NaN
3   NaN
dtype: float64

In [23]:
# Conflicting outputs
print(sum(series_with_all_missing))
print(series_with_all_missing.sum())

Out[23]:
nan
0.0

In [24]:
# Conflicting outputs
print(sum(series_with_2_missing))
print(series_with_2_missing.sum())

Out[24]:
nan
3.0