20.
def validPassword(string):
  length = False
  upperCase = False
  lowerCase = False
  numBool = False
  punctBool = True
  if len(string) >= 8:
    length = True
  else:
    print ("Need at least 8 characters!")
  upCounter = 0
  for i in string:
    for u in "ABCDEFGHIJKLMNOPQRSTUVWXYZ":
      if i == u:
        upCounter +=1
  if upCounter > 0:
    upperCase = True
  else:
    print ("Need at least one upper case letter")
  lowCounter = 0
  for i in string:
    for u in "abcdefghijklmnopqrstuvwxyz":
      if i == u:
        lowCounter +=1
  if lowCounter > 0:
    lowerCase = True
  else:
    print ("Need at least one lower case letter")
  numCounter = 0
  for i in string:
    for u in "1234567890":
      if i == u:
        numCounter +=1
  if numCounter > 0:
    numBool = True
  else:
    print ("Need a number!")
  punctCounter = 0
  for i in string:
    for u in ".?,'!-_+= ":
      if i == u:
        punctCounter +=1
  if punctCounter > 0:
    punctBool = False
    print ("No punctuation or spaces please!")
  if (length and upperCase and lowerCase and numBool and punctBool):
    print ("Valid Password!")
  else:
    print ("Invalid Password!")
  return string

validPassword("yourmomiscool")