Problem 1, isPerfect

def isPerfect(num):
    sum = 0
    for div in range(1,num):
        if num % div == 0:
            sum += div
    return sum == num

alternatively, replace the last line/return statement with

    if sum == num:
        return True
    return False

----
If you use a list comprehension, this will work, but it's not expected
that you come up with it, though understanding it is a good idea

  def isPerfect(num):
      return sum([div for div in range(1,num) if num % div == 0]) == num

---
def combine(phrase):
   st = ""
   for w in phrase:
       st += w[:firstVowelIndex(w)+2]
   return st
---



def isSquareFree(num):

    for x in range(1,n):
        sq = x*x
        if num % sq == 0:
            return False
    return True

---
def wordCount(words,sub):
    """
    return the number of strings in string list words
    that contain string sub
    """
    c = 0
    for w in words:
        if sub in w:
            c = c + 1
    return c

--
or 

def wordCount(words,sub):
    return sum([1 for w in words if w.find(sub) >= 0])


---
def getAgeList(filename, low, high):
    file = open(filename);
    ret = []
    for entry in file:
        ls = entry.split(",")
        animal = ls[0]
        age = int(ls[2])
        if low <= age and age <= high:
            ret.append(animal)

    file.close()
    return ret