Python List Fill Nan
# You can convert to a pandas series and back to a list:
# pd.Series(listname).fillna(0).tolist()
listname = [1, np.nan, 2, None, 3]
pd.Series(listname, dtype=object).fillna(0).tolist()
# [1, 0, 2, 0, 3]
Powerful Penguin