Python 7 Levels, L4, Unit 42, String Operations

Exercise:

print("English-Chinese Dictionary")
d = dict()#create an empty dictionary
while True:
    num = input("Please pick an operation:"\
                "\n1.Add Item\n2.Search Item\n3.Delete Item\n4.Update Item"\
                "\n5.View All Keys\n6.View All Keys and Explanations\n7.Quit\n")
    if num == "7":
        print("Abort System")
        break
    elif num == "1":
        word = input("Please input the word:")
        exp = input("Please input the explanations of the "+word+":")
        d[word] = exp

    elif num == "2":
        word = input("Please input the word you look for:")
        if word in d:
            print(d.get(word))
        else:
            print(word+" does not exist.")
    elif num == "3":
        word = input("Please input the word to be deleted:")
        if word in d:
            del(d[word])
        else:
            print(word + " does not exist.")

    elif num == "4":
        word = input("Please input the word to be updated:")
        if word in d:
            exp = input("Please update "+word+"'s explanations:")
            d[word] = exp
        else:
            print(word + " does not exist.")

    elif num == "5":
        for i in d.keys():
            print(i)
    elif num == "6":
        for i in d.items():
            for j in i:
                print(j,end = " ")
            print()#output a new line