字典的创建与删除方法：
import random
#第1种创建方式
d = {10:"cat", 20:"dog", 30:"monkey"}
print(d)
#第2种创建方式
lst1 = [10,20,30]
lst2=["cat","dog","monkey"]
d = zip(lst1,lst2)
print(dict(d))
#第3种创建方式
d = dict(cat=10,dog=20,monkey=30)
print(d)
t =(10,20,30)
d = {t:10}
print(d)
del d
#字典生成式
d = {item:random.randint(1,100) for item in range(4)}
print(d)
lst1 = [1,2,3]
lst2 = ["cat","dog","monkey"]
d = {key:value for key,value in zip(lst1,lst2)}
print(d)
