from test_scripts.test_class import Test
test = Test()

Validate a string.

Please define a function called alphanumeric that validates if a user input string is alphanumeric.

The function receives a string, and outputs either True or False.

The given string is not nil/null/NULL/None, so you don't have to check that.

The string has the following conditions to be alphanumeric:

• Allowed characters are uppercase / lowercase latin letters and digits from 0 to 9
• No whitespaces / underscore

def alphanumeric(string):
    pass

Test your function with the cell below

test.test_alphanumeric(alphanumeric)

Find the difference between two sets.

In the following cell, we import two sets.

• car_owners = A set of car owners within a community
• church_goers A set of people from the same community who regularly attend chuch

import pickle

path = os.path.join('data', 'car_owners.pkl')
with open(path, 'rb') as driver_file:
    car_owners = pickle.load(driver_file)
    
path = os.path.join('data', 'church_goers.pkl')
with open(path, 'rb') as church_file:
    church_goers = pickle.load(church_file)

In cell below, find the members of the community that do not own cars and attend church regularly.

# Your code here
non_driving_church_goers = None

Test the results with the cell below

test.run_test(non_driving_church_goers, 'set_problem')

We want to identify the individual words within hashtags.

Every hashtag will use PascalCase which means every word will begin with a capital letter.

In the cell below, define a function called split_hashtag that splits a given hashtag into individual words, and returns those words as a list of string.

The function should not return any words with a '#' character.

# Your code here
def split_hashtag(string):
    pass

Run the cell below to test your function!

test.test_hashtag(split_hashtag)