# basic dictionary

d = {}
print(d)
d[2] = 123
print(d)
d = {1:2}
d[3] = 3
print(len(d), d[1], d[3])
d[1] = 0
print(len(d), d[1], d[3])
print(str(d) == '{1: 0, 3: 3}' or str(d) == '{3: 3, 1: 0}')

x = 1
while x < 100:
    d[x] = x
    x += 1
print(d[50])