tags = 'python,coding,programming,development'
tags2 = 'python coding programming development'

list_of_tags = tags.split(',')
new_list_of_tags = tags2.split(' ')

print(list_of_tags)
print(new_list_of_tags)

heading = 'Python: An Introduction'

heading_list = heading.split(': ')

print(heading_list)
