Standard Deviation Puzzles #1.py

import numpy as np

old_lst = [1,2,3]
old_std = round(np.std(old_lst),3)
N = []

for i in np.arange(0,50.0,0.0001):
    new_lst = old_lst + [i]
    new_std = np.std(new_lst)
    if np.abs(new_std - old_std) < 0.0001:
        N.append(round(i,2))
        
print np.max(N)