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Exercise 7

Write a find_integers function that returns a list of all the integers from my_tuple:

my_tuple = (1, 'a', '1', 3, [7], 3.1415,
            -4, None, {1, 2, 3}, False)
integers = find_integers(my_tuple)
print(integers)                    # [1, 3, -4]

You can use the expression type(object) is int to determine whether an object is an integer. For instance:

print(type(True) is int)      # False (boolean)
print(type([1, 2, 3]) is int) # False (list)
print(type(3.141592) is int)  # False (float)
print(type(77) is int)        # True

You may receive a SyntaxWarning warning message from the last two examples. You can ignore that warning.

Solution

def find_integers(things):
    return [ element
             for element in things
             if type(element) is int ]

my_tuple = (1, 'a', '1', 3, [7], 3.1415,
            -4, None, {1, 2, 3}, False)
integers = find_integers(my_tuple)
print(integers)                    # [1, 3, -4]

Our solution uses a list comprehension to iterate through the elements in the things argument and create a new list.

It's worth noting that we used a list comprehension to iterate over the tuple. The main reason for that choice is that find_integers is expected to return a list, not a tuple. However, an even more important reason is that there is no such thing as a "tuple comprehension". Comprehensions don't care what kind of collection you're iterating, but the result must always be a list, set, or dictionary.

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