# Name: Solutions
# Section: 
# strings_and_lists.py

# **********  Exercise 4.1 **********

def sum_all(number_list):
    # number_list is a list of numbers
    total = 0
    for num in number_list:
        total += num

    return total

# Test cases
print "sum_all of [4, 3, 6] is:", sum_all([4, 3, 6])
print "sum_all of [1, 2, 3, 4] is:", sum_all([1, 2, 3, 4])


def cumulative_sum(number_list):
    # number_list is a list of numbers
    out = []
    total = 0
    for num in number_list:
        total += num
        out.append(total)
    return out


# Test Cases
assert cumulative_sum([4, 3, 6]) == [4, 7, 13]
assert cumulative_sum([1, 2, 3]) == [1, 3, 6]
assert cumulative_sum([2, 4, 6]) == [2, 6, 12]

# **********  Exercise 4.2 **********

# Write any helper functions you need here.

VOWELS = ['a', 'e', 'i', 'o', 'u']

def pig_latin(word):
    # word is a string to convert to pig-latin
    if not isinstance(word, str):
        return 'Word must be a string'
    if word[0] in VOWELS:
        pig_word = word + 'hay'
    else:
        pig_word = word[1:] + word[0] + 'ay'
    return pig_word    

# Test Cases
assert pig_latin("boot") == "ootbay"
assert pig_latin("image") == "imagehay"
assert pig_latin("hello") == "ellohay"
assert pig_latin(66) == "Word must be a string"

# **********  HW 2 complete! *********