course_3_assessment_2.py

# 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=list(map(lambda item: 'Fruit: ' + item, lst_check))
print (map_testing)

# 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 = (list (filter(lambda i: i[0]=='B', countries)))

# 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 = [nama[1] for nama in people]

# 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 = [i+i for i in lst]

# 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]

# 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 s: len(s[0])>3 and len(s[1])>3, l3))

# 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 = [x1 for (x1, x2) in pop_info if x2<2500]
print(endangered)