string_names.py

"""Given: an array containing hashes of names

Return: a string formatted as a list of names separated by commas 
except for the last two names, which should be separated by an ampersand.

Example:

namelist([ {'name': 'Bart'}, {'name': 'Lisa'}, {'name': 'Maggie'} ])
# returns 'Bart, Lisa & Maggie'

namelist([ {'name': 'Bart'}, {'name': 'Lisa'} ])
# returns 'Bart & Lisa'

namelist([ {'name': 'Bart'} ])
# returns 'Bart'

namelist([])
# returns ''
Note: all the hashes are pre-validated and will only contain A-Z, a-z, '-' and '.'.
"""

def namelist(names):
    if names:
    	string = ''
    	for count, value in enumerate(names):
    		if count + 1 == len(names):
    			string += "& " + value 
    		else:
    			string += value + ', '
    	return string

    else:
    	return ''

print(namelist([ {'name': 'Bart'}, {'name': 'Lisa'}, {'name': 'Maggie'} ]))