Question

1)
You are given a variable, wwII_battle_winners , that is associated with a dictionary that maps the names of World War II battles to the victors of WWII battles. Writesome code that associates a sorted list of the battle names that appear as keys in this dictionary with the variable battles .

2)

The inverse of a map is a new map where the values of the original map become the keys of the new map and the keys become the values. For example, given the map {1:2,3:4} , the inverse is the map {2:1, 4:3} . Given the map, d , create the inverse of d . Associate the new map with the variable inverse . You may assume that there areno duplicate values in d (that is no two keys in d map to the same value).

3)
Given dictionaries, d1 and d2, create a new dictionary with the following property: for each entry (a, b) in d1, if there is an entry (b, c) in d2, then the entry (a,c) should be added to the new dictionary.
For example, if d1 is {2:3, 8:19, 6:4, 5:12} and d2 is {2:5, 4:3, 3:9}, then the new dictionary should be {2:9, 6:3}
Associate the new dictionary with the variable d3

4)

Given a dictionary d and a list lst, remove all elements from the dictionary whose key is an element of lst. For example, given the dictionary {1:2, 3:4, 5:6, 7:8} andthe list [1, 7], the resulting dictionary would be {3:4, 5:6}.
Assume every element of the list is a key in the dictionary.

Answer 1

Program Screenshots:

1 def remover(d,lst): for i in lst: d.pop (i,None) return d 2 4 1:2, 345:6, 7:8 9 print(remover(d,l)) 10 11 d- [1:2, 3:4, 5:6, 7:8,9:8,10:5 12 l-[1,7,10] 13 print(remover(d,l)) 14 15 d 11:2, 3:4, 5:6, 7:8,12:13,45:90,100:50 16 l-[45,100,12] 17 print(remover(d,l)) 18 13: 4, 5: 6] 13: 4, 5: 6, 9:8) 11: 2, 3: 4, 5: 6, 7: 8] . .Program finished with exit code 0 Press ENTER to exit console

Sample output:

below is the complete program with testinq if you are interested

Code to Copy:

# Use python 3.5 or 3.6

# indentation of the program should be same as provided in the above screenshot:

# declare the dictionary
wwII_battle_winners = {'india':'winner1','china':'winner3','russia':'winner2'}

# assign keys to variable battles.
battles = wwII_battle_winners.keys()

# sort the keys
battles=sorted(battles)

# Display the keys on console.
print (battles)

Answer 2

$\color{blue}Answer:$

battles = list(wwII_battle_winners.keys())
battles.sort()

$\color{blue}below\;is\;the\;complete\;program\;with\;testing\;if\;you\;are\;interested..$

wwII_battle_winners = {
    "b1": "v1",
    "b5": "v2",
    "b2": "v3",
    "b9": "v4",
}

battles = list(wwII_battle_winners.keys())
battles.sort()

print(battles)

Process finished with exit code 0

Answer 3

2 ans:

 inverse = dict(zip(d.values(), d.keys())) 

Answer 4

4) ans:

SOURCE CODE:

def remover(d,lst):
for i in lst:
d.pop(i,None)
return d
  

1 def remover(d,lst): for i in lst: d.pop (i,None) return d 2 4 1:2, 345:6, 7:8 9 print(remover(d,l)) 10 11 d- [1:2, 3:4, 5:6, 7:8,9:8,10:5 12 l-[1,7,10] 13 print(remover(d,l)) 14 15 d 11:2, 3:4, 5:6, 7:8,12:13,45:90,100:50 16 l-[45,100,12] 17 print(remover(d,l)) 18 13: 4, 5: 6] 13: 4, 5: 6, 9:8) 11: 2, 3: 4, 5: 6, 7: 8] . .Program finished with exit code 0 Press ENTER to exit console