HW4

Computer Science 111. Fall, 2006

Homework #4

due: by midnight on October 4

Note: Make sure the inputs required of the user are exactly as specified and in the right order. Your task in this week's homework is to make a better version of the interactive conversation program.

Part 1. Get a copy of the file hw4Judy.pyc from my handout directory (with the command getcopy hw4Judy.pyc).
import hw4Judy and then hw4Judy.main().

Use emacs to write your own version of the program. Here is what your program should do:

Compute the number of strings in cannedlist and place that value in another variable (e.g. I called it num_canned). Do not assign the variable the number directly, such as 8. Compute the number some way. That way if you add a canned response, you don't have to change the number farther down in your code. This is one aspect of modular programming.
Now ask the user how many times to interact and place the answer in a variable.
Get a random canned response from the sequence of canned responses. Use your knowledge of randrange from lab4. Place this string in a variable called computer.
Print the string stored in variable computer and get a response from the user. This will be a string and the user should not have to type quotes around it. Put the response in a variable called user. This is the first interaction.
append both strings to a list stored in a variable called conversation. Recall that we appended sound files to a list in Lab/Hw3. Make sure to initialize conversation to be the empty list.
Now use a counted loop for the remaining interactions.
I will call this the outer loop. The body of the outer loop will make one computer response, either constructed or canned, and then get the next user response. Here's how it will work:
- Use the string.split() function to separate the words in the user string. Place the resulting sequence of words in the variable userwords.
- Next use the string.count() function to count all the occurrences of the strings "You", "you", "I", "am", and "are" in the user string. Make sure you understand the string.count() function by looking it up in your book. Find out what its parameters are and what it returns. Make sure this works by printing out the total number of occurrences of the above words. Take out the print statement when you are convinced it is working.
- Now you will use an if statement to see if the user string has any words to be translated. If it does, the program translates them and prints out the translated string as the computer response. Otherwise, it will print out one of the canned responses. Do this as follows:
  The if statement is described in ch 7, pg 209. Its template is
```
if <condition>:
     <statements>
else:
     <statements>
```
  Your condition will be (num_occurrences < 1) where num_occurrences will be set equal to the total number of occurrences of any of the words "I", "You", "you", "are", and "am" as described in the previous step. If num_occurrences is less than 1, then get a canned response, randomly, from the sequence of canned responses stored in cannedlist and store it in the variable computer.
  If num_occurrences is not less than 1, then after the else:
  - In this case, some words need to be replaced. First, assign the variable computer equal to the empty string, which is "".
  - Then go through the sequence of words (userwords) using another for loop, just as you did in the last part of the lab. I will call this the inner loop. You will use a long if statement here that checks for each of the words one by one, by using the string.replace() function and then seeing if the word has changed.
  - The last statement in the body of the inner for loop is the one that concatenates variable word to computer and also concatenates the string " " that contains one space.
After the if-else statement in the outer loop, make sure to append the computer and user strings to the list stored in conversation.
After that, print out the computer response, and get the next user string.
The last statement in the body of the outer for loop should be to re-initialize the variable num_occurrences to 0.
After the body of the outer for loop, print a goodbye message to the screen and also append the same message out to the list stored in conversation.
Finally, print a few blank lines, the print the conversation, using the list stored in conversation. Make sure there is one string printed per line, and no blank lines in between.

Notes and Reminders

Don't worry about punctuation marks.

The total number of inputs from the user should be 1 for the number of interactions, plus exactly the same number of strings from the user as is indicated in num_interactions.
In other words the total number of inputs from the user is num_interactions+1. The first is an integer and the rest are strings. If you are unsure, count them as you run your program and type in the strings.

Remember, all of the interaction must be appended to the list stored in conversation. This means that each string the user types in must be appended, and the computer's response appended.

Your final program should be in a file called hw4.py Submit this homework by the due date with the command submit homework4 hw4.py