用字符串值计算数字列表

Question

我有一个包含 NaN 值的数字列表，我想对其应用数学函数。我还需要在计算后保持这些 NaN 值仍然存储

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)

Answer 1

你可以使用熊猫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]

或者您的解决方案，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]