Dictionaries

Dictionaries are set of elements.

• Ordered

• Unordered

• Sorted

• Random

2. Dictionaries are _____ data types of Python.

• Mutable

• Simple

• Immutable

• All of these

Which of the following will raise an error if the given key is not found in the dictionary ?

• del statement

• pop()

• getitem()

• all of these

4. Which of the following is correct with respect to above Python code?

d = {"a":3,"b":7}

• (a) a dictionary d is created.

• (b) a and b are the keys of dictionary d.

• (c) 3 and 7 are the values of dictionary d.

• (d) All of these.

What would the following code print?

d = {'spring': 'autum', "autumn": "fall", "fall":"spring"}

print (d["autumn"])

• (a) autumn

• (b) fall

• (c) spring

• (d) Error

What is printed by the following statements?

6. D1 = {"cat":17, "dog":6, "elephant":23, "bear":20}

   print ("dog" in D1)

• 6. (a) True

• 6. (b) False

• 6. (c) Error

• 6. (d) None

7. Which of the following will delete key_value pair for key = "tiger" in dictionary?

   di = {"loin" : "wild", "tiger" : "wild", "cat": "domestic" : "dog" : "domestic"}

• 7. (a) del di["tiger"]

• 7. (b) di[“tiger”].delete()

• 7. (c) delete(di.["tiger"])

• 7. (d) del(di.["tiger])

8. Which of the following Python codes will give the same output if

   dict = {"diary":1, "book":3, "novel":5}

9. (i) dict.pop("book")

   (ii) del dict["book"]

   (iii) dict.update({"diary":1,"novel":5})

• 8. (a) (i), (ii), (iii)

• 8. (b) (i), (ii)

• 8. (c) (i), (iii)

• 8. (d) (ii), (iii)

9. To create a dictionary, the items entered are separated by _______ and enclosed in ________.
   

• 9. a. Commas and Curly braces 
     

• 9. b. Commas and Round braces
     

• 9. c. Colon and Curly braces
     

• 9. d. None of the above

10. The keys in the dictionary must be _______ and should be of any ________ data type.
    

• 10. a. Unique and Mutable
      

• 10. b. Unique and Immutable 
      

• 10. c. Repeated and Mutable
      

• 10. d. None of the above