L = [[3,0,4,5,7,3],[2,1,3,5],[1,4,7],[10000000,5]]
M = sorted(L,key = lambda x: sum(x))
#print(id(M))
#print(id(L))
print(M)
#print(L)
    
L = [[3,4],[5,1],[0,0],[2,8], [5,0]]
#print(sorted(L))
print(sorted(L, key= lambda x: x[0]+x[1]))
#print(sorted(L, key= lambda x: x[0]+x[1], reverse=True))

wavelengths = {'blue':400, 'green':500}
#print(wavelengths['aquamarine']) #error
print(dir(wavelengths))
print(wavelengths.keys())
print(wavelengths['blue'])

wavelengths['blue'] = 9999
wavelengths['red'] = 700

for item in wavelengths:
    print(wavelengths[item])