Course 3 – Data Collection and Processing with Python – Week 2 – course_3_assesment_2

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# 1) Write code to assign to the variable map_testing all the elements in lst_check while adding the string “Fruit: ” 
# to the beginning of each element using mapping.

lst_check = ['plums', 'watermelon', 'kiwi', 'strawberries', 'blueberries', 'peaches', 'apples', 'mangos', 'papaya']

map_testing = map(lambda str: "Fruit: " + str, lst_check)
print(map_testing)

# Ouput: ['Fruit: plums', 'Fruit: watermelon', 'Fruit: kiwi', 'Fruit: strawberries', 'Fruit: blueberries', 'Fruit: peaches', 'Fruit: apples', 'Fruit: mangos', 'Fruit: papaya']



# 2) Below, we have provided a list of strings called countries. Use filter to produce a list called 
# b_countries that only contains the strings from countries that begin with B.

countries = ['Canada', 'Mexico', 'Brazil', 'Chile', 'Denmark', 'Botswana', 'Spain', 'Britain', 'Portugal', 'Russia', 'Thailand', 'Bangladesh', 'Nigeria', 'Argentina', 'Belarus', 'Laos', 'Australia', 'Panama', 'Egypt', 'Morocco', 'Switzerland', 'Belgium']

b_countries = filter(lambda x: 'B' in x, countries)
print(b_countries)

# Output: ['Brazil', 'Botswana', 'Britain', 'Bangladesh', 'Belarus', 'Belgium']



# 3) Below, we have provided a list of tuples that contain the names of Game of Thrones characters. 
# Using list comprehension, create a list of strings called first_names that contains only the first names 
# of everyone in the original list.

people = [('Snow', 'Jon'), ('Lannister', 'Cersei'), ('Stark', 'Arya'), ('Stark', 'Robb'), ('Lannister', 'Jamie'), ('Targaryen', 'Daenerys'), ('Stark', 'Sansa'), ('Tyrell', 'Margaery'), ('Stark', 'Eddard'), ('Lannister', 'Tyrion'), ('Baratheon', 'Joffrey'), ('Bolton', 'Ramsey'), ('Baelish', 'Peter')]

first_names = [name[1] for name in people]
print(first_names)


# Output: ['Jon', 'Cersei', 'Arya', 'Robb', 'Jamie', 'Daenerys', 'Sansa', 'Margaery', 'Eddard', 'Tyrion', 'Joffrey', 'Ramsey', 'Peter']



# 4) Use list comprehension to create a list called lst2 that doubles each element in the list, lst.

lst = [["hi", "bye"], "hello", "goodbye", [9, 2], 4]

lst2 = [element + element for element in lst]
print(lst2)

# Output: [['hi', 'bye', 'hi', 'bye'], 'hellohello', 'goodbyegoodbye', [9, 2, 9, 2], 8]



# 5) Below, we have provided a list of tuples that contain students’ names and their final grades in PYTHON 101. 
# Using list comprehension, create a new list passed that contains the names of students who passed the class 
# (had a final grade of 70 or greater).

students = [('Tommy', 95), ('Linda', 63), ('Carl', 70), ('Bob', 100), ('Raymond', 50), ('Sue', 75)]

passed = [name[0] for name in students if name[1] >= 70]
print(passed)

# Output: ['Tommy', 'Carl', 'Bob', 'Sue']



# 6) Write code using zip and filter so that these lists (l1 and l2) are combined into one big list 
# and assigned to the variable opposites if they are both longer than 3 characters each.

l1 = ['left', 'up', 'front']
l2 = ['right', 'down', 'back']
l3 = zip(l1, l2)

opposites = list(filter(lambda arg: len(arg[0]) > 3 and len(arg[1]) > 3, l3))
print(opposites)

# Output: [('left', 'right'), ('front', 'back')]


# 7) Below, we have provided a species list and a population list. Use zip to combine these lists into 
# one list of tuples called pop_info. From this list, create a new list called endangered that contains 
# the names of species whose populations are below 2500.

species = ['golden retriever', 'white tailed deer', 'black rhino', 'brown squirrel', 'field mouse', 'orangutan', 'sumatran elephant', 'rainbow trout', 'black bear', 'blue whale', 'water moccasin', 'giant panda', 'green turtle', 'blue jay', 'japanese beetle']

population = [10000, 90000, 1000, 2000000, 500000, 500, 1200, 8000, 12000, 2300, 7500, 100, 1800, 9500, 125000]

pop_info = list(zip(species, population))
endangered = [x for (x, x1) in pop_info if x1 < 2500]
print(endangered)

# Output: ['black rhino', 'orangutan', 'sumatran elephant', 'blue whale', 'giant panda', 'green turtle']

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