如果你经常做这件事，把它放到一个函数中，使其可读性更强:

If you're doing it a lot, put it into a function to make it readable and easy:

import math

t = [float('nan'), float('nan'), 5.5, 5.0, 5.0, 5.5, 6.0, 6.5]

def firstNonNan(listfloats):
  for item in listfloats:
    if math.isnan(item) == False:
      return item

firstNonNan(t)
5.5