how to calculate mean in python

1import statistics
2
3a = [1,2,3,4,5]
4
5mean = statistics.mean(a) 
6#Similar for other values such as variance, standard deviation

1import numpy as np
2values=[1,10,100]
3print(np.mean(values))
4values=[1,10,100,np.nan]
5print(np.nanmean(values))

1def calculate_mean(n):
2    s = sum(n)
3    N = len(n)
4    
5    mean = s / N
6    
7    return mean