150 

   151 

   152 Questions

   153 =========

   154 

   155  1. If ``a = [1, 1, 2, 3, 3, 5, 5, 8]``. What is set(a)

   156 

   157    a. set([1, 1, 2, 3, 3, 5, 5, 8])

   158    #. set([1, 2, 3, 5, 8])

   159    #. set([1, 2, 3, 3, 5, 5])

   160    #. Error

   161 

   162    Answer: set([1, 2, 3, 5, 8])

   163 

   164  2. ``a = set([1, 3, 5])``. How do you find the length of a?

   165 

   166    Answer: len(a)

   167 

   168  3. ``a = set([1, 3, 5])``. What does a[2] produce?

   169 

   170    a. 1

   171    #. 3

   172    #. 5

   173    #. Error

   174 

   175    Answer: Error

   176 

   177  4. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What

   178     is the value of ``odd | squares``?

   179 

   180    Answer: set([1, 3, 4, 5, 7, 9, 16])

   181 

   182  5. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What

   183     is the value of ``odd - squares``?

   184 

   185    Answer: set([3, 5, 7])

   186 

   187  6. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What

   188     is the value of ``odd ^ squares``?

   189 

   190    Answer: set([3, 4, 5, 7, 16])

   191 

   192  7. ``odd = set([1, 3, 5, 7, 9])`` and ``squares = set([1, 4, 9, 16])``. What

   193     does ``odd * squares`` give?

   194 

   195    a. set([1, 12, 45, 112, 9])

   196    #. set([1, 3, 4, 5, 7, 9, 16])

   197    #. set([])

   198    #. Error

   199 

   200    Answer: Error

   201 

   202  8. ``a = set([1, 2, 3, 4])`` and ``b = set([5, 6, 7, 8])``. What is ``a + b``

   203 

   204    a. set([1, 2, 3, 4, 5, 6, 7, 8])

   205    #. set([6, 8, 10, 12])

   206    #. set([5, 12, 21, 32])

   207    #. Error

   208 

   209  9. ``a`` is a set. how do you check if if a varaible ``b`` exists in ``a``?

   210 

   211    Answer: b in a

   212 

   213  10. ``a`` and ``b`` are two sets. What is ``a ^ b == (a - b) | (b - a)``?

   214 

   215    a. True

   216    #. False

   217 

   218    Answer: False

   219 

   220 

   221 Problems

   222 ========

   223 

   224  1. Given that mat_marks is a list of maths marks of a class. Find out the

   225     no.of duplicates marks in the list.

   226 

   227    Answer::

   228 

   229      unique_marks = set(mat_marks)

   230      no_of_duplicates = len(mat_marks) - len(unique_marks)

   231 

   232  2. Given that mat_marks is a list of maths marks of a class. Find how many

   233     duplicates of each mark exist.

   234 

   235    Answer::

   236 

   237      marks_set = set(mat_marks)

   238      for mark in marks_set:

   239          occurences = mat_marks.count(mark)

   240          print occurences - 1, "duplicates of", mark, "exist"