#!/usr/bin/python3

#define dictionary
dic = {
    'alice':100,
    'bob':200,
    'shak':300,
}
#get value by key
x = dic["bob"]

#set value by key
dic["alice"] = 400

#print all keys
for x in dic:
    print(x)

#print all values
for x in dic:
    print(dic[x])