Unit-V-Set Q & A

Indicate all of the following that are syntactically correct for creating a set.

• set([1, 2, 3])

• set((1, 2, 3))

• {1, 2, 3}

• [1,2,3]

For set s containing values 1, 2, 3, and set t containing 3, 4, 5, which of the following are the correct results for each given set operation?

• (a) s | t -> {3}

• s & t -> {1, 2, 3, 4, 5}

• s - t->{1, 2}

• s ^ t -> {1, 2, 4, 5}

For set s containing values 1, 2, 3 and set w of type frozenset containing values 'a','b','c', which of the following are valid set operations?

• 'a' in s

• 'a' in w

• len(s) + len(w)

• s.add(4)

• w.add('d')

A dictionary type in Python is an associative data structure that is accessed by a _______________ rather than an index value.

• key

• value

• key value

• index

Associative data structures such as the dictionary type in Python are useful for,

• accessing elements more intuitively than by use of an indexed data structure

• maintaining elements in a particular order

• insert and update

• delete and drop

Which of the following types can be used as a key in Python dictionaries?

• strings

• lists

• tuples

• numerical values

Which of the following is a syntactically correct sequence, s, for dynamically creating a dictionary using dict(s).

• s = [[1: 'one'],

  [2: 'two'], [3: 'three']]

• s = [[1, 'one'], [2, 'two'], [3, 'three']]

• s = {1:'one', 2:'two', 3:'three'}

• s ={[1:'one', 2:'two', 3:'three']}

For dictionary d = {'apples':0.66,'pears':1.25,'bananas':0.49}, which of the following correctly updates the price of bananas.

• d[2] = 0.52

• d[0.49] = 0.52

• d['bananas'] = 0.52

• d['bananas'] [ 0.52]