Charlie.py

import collections

def replace(l, x, y):

    s = l.split(",")
    print s
    
    keys = x # Strings to be replaced
    values = y # Strings to replace with
    
    
    isComplete = False # Boolean
    
    # Check if lengths of x and y arguments are equal before proceeding
    if(len(x) is not len(y)):
        print isComplete
        print 'Lengths do not match'
        return 
    
    # Map a dictionary of x and y
    dict = getDictionary(x,y)
    
    # List of the final string to return
    finalString = list()
    
    # Get the count of the replacements
    counterList = list()
        
    # Iterate over the initial list
    for count,string in enumerate(s): 
    
        # Build our new list - which at first is a copy of the original
        finalString.insert(count, s[count])
        
        # If the string in the new list we're building is equal to the current string in the list of strings to be replaced
        # then replace its associated value from the dictionary
        # Also add this string to the counter so we know it was removed (we can count occurences of that string later to get total count)
        if string in dict.keys():                
            counterList.insert(count, string)
            finalString.remove(string)
            finalString.insert(count, str(dict.get(string))) 
            
    isComplete = True
    print isComplete
    
    getNumberOfTimes(counterList, keys)   
    return finalString

# Returns a dictionary from 2 lists
def getDictionary(x,y):
    if (len(x) is len(y)):
        dictionary = dict(zip(x, y))        
        return dictionary

# Gets the number of times items were replaced    
def getNumberOfTimes(removedList, originalList):
    
    itemList = [item for item in collections.Counter(removedList).items()]
    
    temp3 = [x for x in originalList if x not in removedList]
  
    for y in itemList:
        if y[1] is 1:
            print y[0] + " removed " + str(y[1]) + " time"
        else:
            print y[0] + " removed " + str(y[1]) + " times"
  
            
    for z in temp3:
        print z + " removed " + str(0) + " times" 


# Main Method
def main():
    txt = "yes,the,answer,is,yes"

    newString = replace(txt,["yes","the","twelve"],["no","a", "thirteen"])
    if(newString):
        print newString

# Program Entry point
if __name__ == "__main__":
    main()