1. CMPT 120 Lecture 6 – Unit 1 – Chatbots
Python – More on Conditional statements and Boolean Expressions

2. Homework Show Case Problem Statement
Write a chatbot that prints random cookie fortune statements
# Fortune Cookie
# Gives a random fortune
# Date: 5/15/19
import random
# First gives a prompt to break the cookie.
cookie = input("Hello there, press enter to break this cookie.")
# This is the list of possible fortune given by the cookie.
fortune = ["Gift of Luck", "Gift of Love", "Gift of Power",
"Gift of Misfortune", "Gift of Friendship"]
# this random chooses from the list of fortunes
luck = random.choice(fortune)
# prints the outcome
print(luck)
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3. Review from last lecture
What is wrong with this Python code fragment?
# Say How is it going? and get user's reply
reply = input("How is it going? ")
# Say Glad to hear if the user is doing well
if reply == "Awesome!" :
print("Glad to hear!")
else:
# And Sorry things are not going well! otherwise
print("Sorry to hear things are not going well!")

4. Review from last lecture
What is wrong with this Python code fragment?
Note the usefulness of the comments!
# Chatbot asks How old are you?
age = input("How old are you? ")
# If the user is old enough to drink ...
if age >= 19 :
# Chatbot suggest an alcoholic drink.
print("How about a beer?")
else :
# Otherwise, a non-alcoholic drink.
print("How about a Shirley Temple?")

5. Conversion functions int( ... ) -> convert into an integer
float( ... ) -> convert into a floating point
number
str( ... ) -> convert into a string
Example
gradeMT = float(input("Please, enter MT grade: "))

6. Review Input function input( ) or input( prompt ) How it works:
The prompt is printed on the screen
The user enters the requested data then presses Enter
This data is returned from the function input( ) into our program as a string
GPS: When prompting the user, we must give her/him clear and unambiguous instructions:
Description of what to enter: Enter your name:
Example of values to enter: (yes/no)
The format of this value (if possible)
The range of the value: Enter a number between 1 and 10:
etc...

7. GPS related to input and output statements and user interaction
From a user perspective, i.e., from the perspective of the person typing her/his name, which user interaction would we prefer? User interaction #1 or User interaction #1
Why?
User interaction # 1
User interaction # 2

8. Last Lecture, we did … 1. Fortune Cookie Generator :
2. How's it going? Chatbot - version 1 (if/else)
3. How's it going? Chatbot - version 2 (if/elif/else)
4. How's it going? Chatbot - version 3 (if/elif/elif/else)
5. How's it going? Chatbot - version 4 (if/elif/else and compound condition using “or”)

9. Review from last lecture
Do these 2 Python code fragments produce the same result? A B
grade = 78
if grade < 60 :
print("F")
else :
if grade < 70 :
print("D")
if grade < 80 :
print("C")
if grade < 90 :
print("B")
print("A")
grade = 78
if grade < 60 :
print("F")
elif grade < 70 :
print("D")
elif grade < 80 :
print("C")
elif grade < 90 :
print("B")
else :
print("A")

10. Review from last lecture
Do these 2 Python code fragments produce the same result? B C
grade = 78
if grade < 60 :
print("F")
elif grade < 70 :
print("D")
elif grade < 80 :
print("C")
elif grade < 90 :
print("B")
else :
print("A")
grade = 78
if grade < 60 :
print("F")
if grade < 70 :
print("D")
if grade < 80 :
print("C")
if grade < 90 :
print("B")
else :
print("A")

11. Hand Tracing What is it? Why doing it?
When a software developer manually goes through her/his code (program) and “execute” it as if s/he was a computer, mimicking the Python Interpreter
Why doing it?
To figure out what our program does/produces, hence to verify whether our program is solving the problem
To determine whether our program contains any errors

12. Little Exercise – Version 1
if condition 1 : if condition 2 : some statements A if condition 3 : some statements B else : some statements C if condition 4 : some statements D some statements E some statements F some statements G

13. Little Exercise – Version 2
if condition 1 : if condition 2 : some statements A if condition 3 : some statements B else : some statements C if condition 4 : some statements D some statements E some statements F some statements G

14. Homework Problem Statement
Write a login program, which allows a user to login in with a password

15. Examples of Boolean

16. Next Lecture Let’s build a simple game!
Problem Statement
Write a guessing game, which allows a user to guess a number between 1 and 10
Wouldn’t it be nice to play our guessing game many times without having to press Run over and over again?