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Exercise 11

Without running the following code, determine what each line should print.

print('johnson' in 'Joe Johnson')
print('sen' not in 'Joe Johnson')
print('Joe J' in 'Joe Johnson')
print(5 in range(5))
print(5 in range(6))
print(5 not in range(5, 10))
print(0 in range(10, 0, -1))
print(4 in {6, 5, 4, 3, 2, 1})
print({1, 2, 3} in {1, 2, 3})
print({3, 2} in {1, frozenset({2, 3})})

Solution

print('johnson' in 'Joe Johnson')      # False
print('sen' not in 'Joe Johnson')      # True
print('Joe J' in 'Joe Johnson')        # True
print(5 in range(5))                   # False
print(5 in range(6))                   # True
print(5 not in range(5, 10))           # False
print(0 in range(10, 0, -1))           # False
print(4 in {6, 5, 4, 3, 2, 1})         # True
print({1, 2, 3} in {1, 2, 3})          # False
print({3, 2} in {1, frozenset({2, 3})}) # True

Line 1: in with strings is case sensitive.
Line 4: range(5) does not include 5; it ranges from 0 to 4.
Line 7: range(10, 0, -1) does not include 0; it ranges from 10 to 1.
Line 9: in with sets only checks whether a specific value is in the set.
Line 10: {3, 2} and frozenset({2, 3}) are considered equal sets.

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