python - Calculating numeric list with string values

Question

I have a numeric list with NaN values and I want to apply mathematical functions to it. Also I need keep those NaN values to be stored still after computation

list_a = [1827.07, 1376.21, nan, nan, 1001.88, 978.07]
recal_list = []
for i in list_a:
    time = round(i/55)
    recal_list.append(time)

question from:https://stackoverflow.com/questions/65862172/calculating-numeric-list-with-string-values

Answer 1

You could use a pandas Series

from pandas import Series
from numpy import nan

list_a = [1827.07, 1376.21, nan, nan, 1001.88, 978.07]
result = round(Series(list_a) / 55)
print(result.tolist())  # [33.0, 25.0, nan, nan, 18.0, 18.0]

Or your solution, with an if

from numpy import nan, isnan

list_a = [1827.07, 1376.21, nan, nan, 1001.88, 978.07]
recal_list = []
for val in list_a:
    recal_list.append(val if isnan(val) else round(val / 55))
print(recal_list)  # [33.0, 25.0, nan, nan, 18.0, 18.0]