4 ways to create dictionaries in Python

1. Use braces to create a dictionary
     person = {"name":"Zhang San","age":18,"pay":40000,"job":"Python Engineer"}
 2. Use keyword parameters and type constructors to create dictionary
     person = dict(name="Zhang San",age=18,pay=40000,job="Python Engineer")
 3. Use the zip function to link names/value lists together to create a dictionary
     keys = ["name","age","pay","job"]
     values = ["Zhang San", 18,40000,"Python Engineer"]
     person = dict(zip(keys,values))
 4. Use fromkeys to create a dictionary through a sequence of keys and optional initial values for all keys.
     keys = ["name","age","pay","job"]
     person = (keys,"?")