# Tutorial 3 - Problem 3

##def any_lowercase1(s):
##  """ This function only looks at the first letter in s
##      returning True if it is lowercase, False otherwise.
##  """
##  for c in s:
##    if c.islower():
##      return True
##    else:
##      return False


# First, here is the above function re-written based on GPS:
# Note that this is extra, this was not asked in Problem 3
def first_letter_is_lowercase(aString):
  """ This function only looks at the first letter in its parameter
      aString and returns True if this letter is a lowercase letter,
      False otherwise.

      Pre-condition: parameter aString cannot be an empty string
      and it must be composed of characters that will not crash
      the program when the string method .islower() is called.
      
  """
  returnedValue = False
  # Return True if the first letter of aString is a lowercase letter
  if aString[0].islower():
    returnedValue = True
  return returnedValue

# Answer to Problem 3:
# The function below returns True if there are any lower case letters
# in the string parameter (at least one).
def any_lowercase(aString):
  """ This function returns True if there are any lower case letters in the string parameter,
      False otherwise.

      Pre-condition: parameter aString cannot be an empty string
      and it must be composed of characters that will not crash
      the program when the string method .islower() is called.     
  """
  returnedValue = False
  # Return True if the first letter of aString is a lowercase letter
  for letter in aString:
    if letter.islower():
      returnedValue = True
  return returnedValue



# Main part of program

# What test data will we use to test this function?
# Here are some: 
print('first_letter_is_lowercase("paul")): ', first_letter_is_lowercase("paul"))
print('first_letter_is_lowercase("Paul")): ', first_letter_is_lowercase("Paul"))
print('first_letter_is_lowercase("PAUl")): ', first_letter_is_lowercase("Paul"))
print('first_letter_is_lowercase("PAUL")): ', first_letter_is_lowercase("PAUL"))
print('first_letter_is_lowercase("pAUL")): ', first_letter_is_lowercase("pAUL"))
# Can we create a few more test cases?
print('any_lowercase("paul")): ', any_lowercase("paul"))
print('any_lowercase("Paul")): ', any_lowercase("Paul"))
print('any_lowercase("PAUl")): ', any_lowercase("Paul"))
print('any_lowercase("PAUL")): ', any_lowercase("PAUL"))
print('any_lowercase("pAUL")): ', any_lowercase("pAUL"))

# Actual results from our test cases:
##first_letter_is_lowercase("paul")):  True
##first_letter_is_lowercase("Paul")):  False
##first_letter_is_lowercase("PAUl")):  False
##first_letter_is_lowercase("PAUL")):  False
##first_letter_is_lowercase("pAUL")):  True
##any_lowercase("paul")):  True
##any_lowercase("Paul")):  True
##any_lowercase("PAUl")):  True
##any_lowercase("PAUL")):  False
##any_lowercase("pAUL")):  True