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CMPT 120

CMPT 120. Lecture 6 – Unit 1 – Chatbots Python – More on Conditional statements and Boolean Expressions. Homework Show C ase. Problem Statement Write a chatbot that prints random cookie fortune statements. # Fortune Cookie

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CMPT 120

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  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) Thank you for sharing your link

  3. Review from last lecture • What is wrong with this Python code fragment? https://repl.it/repls/OverdueSadBackup # 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! https://repl.it/repls/InconsequentialMelodicConference # 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 : https://repl.it/repls/RuddyIdealApplets 2. How's it going? Chatbot - version 1 (if/else) https://repl.it/repls/BusyOnerlookedIteration 3. How's it going? Chatbot - version 2 (if/elif/else) https://repl.it/repls/DefensiveVeneratedMicrobsd 4. How's it going? Chatbot - version 3 (if/elif/elif/else) https://repl.it/repls/DopeyVitalApplicationprogrammer 5. How's it going? Chatbot - version 4 (if/elif/else and compound condition using “or”) https://repl.it/repls/MushyFaroffQuadrants

  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") else : if grade < 80 : print("C") else : if grade < 90 : print("B") else : 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? C B 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") 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")

  11. Hand Tracing • What is 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 else : some statements E else : some statementsF some statementsG

  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 else : some statements E else : some statementsF some statementsG

  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?

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