From the main Notebook:

import numpy as np

filedata = np.loadtxt("Files/weatherdata.csv", delimiter=",", skiprows=1)

temperatures = filedata[:, 0] 

average = temperatures.mean()

deviations = temperatures - average

np.savetxt("deviations.csv", deviations, delimiter = ",", fmt="%.1f")

From the solutions folder:

import numpy as np

filedata = np.loadtxt("../Files/weatherdata.csv", delimiter=",", skiprows=1)

temperatures = filedata[:, 0] 

average = temperatures.mean()

deviations = temperatures - average

np.savetxt("../deviations.csv", deviations, delimiter = ",", fmt="%.1f")