Python lab 10/10 Dictionary

dict1={1:"Monday",0:"Sunday",6:"Saturday",2:"Tuesday",3:"Wednesday",4:"Thursday",5:"Friday"}
sum=0
for i in dict1:
    sum=sum+i
print(sum)
dict1[7]="FUNDAY" #Adding new element or update if already exist
print(dict1) 
dict1.update({1:"Sombaar"}) #updating value or add if not exist
print(dict1)
l1=list(dict1.keys())
l1.sort()
dict2={x:dict1[x] for x in l1}
print("Sorted: ",dict2)
l2=list(dict1.values())
l2.sort()
dict3={l2.index(x):x for x in l2}
print(dict3)
l3=list(dict1.keys())
l3.reverse()
dict4={x:dict1[x] for x in l3}
print(dict4)