Python Function, Files and Dictionaries - Week5 -course_2_assesment_8

course_2_assessment_8.py

# 1) Sort the following string alphabetically, from z to a, and assign it to the variable sorted_letters.

# Answer:

letters = "alwnfiwaksuezlaeiajsdl"
sorted_letters = sorted(letters, reverse = True)



# 2) Sort the list below, animals, into alphabetical order, a-z. Save the new list as animals_sorted.

# Answer:

animals = ['elephant', 'cat', 'moose', 'antelope', 'elk', 'rabbit', 'zebra', 'yak', 'salamander', 'deer', 'otter', 'minx', 'giraffe', 'goat', 'cow', 'tiger', 'bear']
animals_sorted = sorted(animals)



# 3) The dictionary, medals, shows the medal count for six countries during the Rio Olympics. Sort the country names so they appear alphabetically. 
# Save this list to the variable alphabetical.

# Answer:

medals = {'Japan':41, 'Russia':56, 'South Korea':21, 'United States':121, 'Germany':42, 'China':70}
alphabetical = sorted(medals)



# 4) Given the same dictionary, medals, now sort by the medal count. Save the three countries with the 
# highest medal count to the list, top_three.

# Answer:

medals = {'Japan':41, 'Russia':56, 'South Korea':21, 'United States':121, 'Germany':42, 'China':70}

def sort(ctry, mdls):
    return mdls[ctry]

top_three = sorted(medals, key = lambda x : sort(x, medals), reverse = True)[:3] 
print(top_three)



# 5)We have provided the dictionary groceries. You should return a list of its keys, but they should be 
# sorted by their values, from highest to lowest. Save the new list as most_needed.

# Answer:

groceries = {'apples': 5, 'pasta': 3, 'carrots': 12, 'orange juice': 2, 'bananas': 8, 'popcorn': 1, 'salsa': 3, 'cereal': 4, 'coffee': 5, 'granola bars': 15, 'onions': 7, 'rice': 1, 'peanut butter': 2, 'spinach': 9}


def priority(item, value):
    return value[item]

most_needed = sorted(groceries, key = lambda x: priority(x, groceries), reverse = True)
print(most_needed)



# 6) Create a function called last_four that takes in an ID number and returns the last four digits. 
# For example, the number 17573005 should return 3005. Then, use this function to sort the list of ids 
# stored in the variable, ids, from lowest to highest. Save this sorted list in the variable, sorted_ids. 
# Hint: Remember that only strings can be indexed, so conversions may be needed.

# Answer:

def last_four(x):
    return str(x)[-4:]

ids = [17573005, 17572342, 17579000, 17570002, 17572345, 17579329]
sorted_ids = sorted(ids, key = last_four)
print(sorted_ids)


# 7)Sort the list ids by the last four digits of each id. Do this using lambda and not using a defined 
# function. Save this sorted list in the variable sorted_id.

# Answer:

ids = [17573005, 17572342, 17579000, 17570002, 17572345, 17579329]
sorted_id = sorted(ids, key = lambda x: str(x)[-4])
print(sorted_id)



# 8) Sort the following list by each element’s second letter a to z. Do so by using lambda. 
# Assign the resulting value to the variable lambda_sort.

# Answer:

ex_lst = ['hi', 'how are you', 'bye', 'apple', 'zebra', 'dance']
lambda_sort = sorted(ex_lst, key = lambda x: x[1])
print(lambda_sort)