Problem 1
-----------

[w for w in compounds if len(w) < 6]

[5*x for x in range(5,820)]  OR
[x for x in range(1,4096) if x % 5 == 0]

[x for x in range(2,10000) if prime(x)]

Problem 2
-----------

def minDistance(points):
   
   md = distance(points[0],points[1])
   for i,p in enumerate(points):
       for q in enumerate(points[i+1:]):
           d = distance(p,q)
           if d < md:
               md = d
   return md

--
Alternatively, initialize md to 100000000000 (a large number)

Problem 3
----------
total = sum([data[1]*data[2] for data in stocks])

highPrice = max([d[1] for d in stocks])

biggies = [s[0] for s in stocks if s[1] > 500]

Problem 4
---------

def removeBad():
  global badLetters, possibleWords
  possibleWords = [ w for w in possibleWords if set(w) & badLetters == set() ]

OR use len(badletters) == 0
OR

  badset = set()
  for w in possibleWords:
      for b in badLetters:
          if b in w:
              badset.add(w)

  possibleWords = list(set(possibleWords) - badset)


OR
  copy = possibleWords[:]
  for word in copy:
      for letter in word:
          if letter in badLetters:
              possibleWords.remove(word)
              break

-----
Problem 5
----------

mean = float(sum(nums)) / len(nums)
--
median = sorted(nums)[len(nums) / 2]

OR

 nums.sort()
 middle = len(nums)/2
 median = nums[middle]

--

counts = {}
for n in nums:    
    counts[n] = counts.get(n, 0) + 1

mode = counts.keys()[counts.values().index(max(counts.values()))]

OR

moccurs = 0
mvalue = 0
for n in nums:
    if nums.count(n) > moccurs:
        moccurs = nums.count(n)
        mvalue = n

mode = mvalue

OR

count = {}
for n in nums:
    if n not in count:
        count[n] = 0
    count[n] += 1

pairs = [(value,key) for (key,value) in count.items]
pairs.sort()
mode = pairs[-1][1]  #last value has maximal occurrences, key is [1]

Problem 6
-------------

def bbFan(filename):
  file = open(filename)
  counts = {}
  for line in file:
      data = line.split(',')
      for email in set(data[1:])
          if email in counts:
             counts[email] += 1
          else:
             counts[email] = 1
  file.close()

  vals = sorted([ (x[1], x[0]) for x in counts.items() ])
  return vals[-1][1]


OR

file = open(filename)
  counts = {}
  for line in file:
      data = line.split(',')
      song = data[0]
      for email in set(data[1:])
          if email not in counts:
             counts[email] = []
          counts[email].append(song)
  file.close()

  vals = sorted([ (len(x[1]), x[0]) for x in counts.items() ])
  return vals[-1][1]


OR, after file.close()

  most = 0
  for id in counts:
      likes = counts[id]
      if len(likes) > most:
          most = len(likes)
          maxid = id

  return maxid