Question

Python program. Write a function called cleanLowerWord that receives a string as a parameter and returns a new string that is a copy of the parameter where all the lowercase letters are kept as such, uppercase letters are converted to lowercase, and everything else is deleted. For example, the function call

cleanLowerWord("Hello, User 15!")

should return the string "hellouser".

For this, you can start by copying the following functions discussed in class into your file:

# Checks if ch is a lowercase letter.
def isLower(ch):
    return 'a' <= ch and ch <= 'z'

# Checks if ch is an uppercase letter.
def isUpper(ch):
    return 'A' <= ch and ch <= 'Z'

# Converts ch to a lowercase letter if it's an uppercase letter,
# and returns it unchanged if not.
def toLower(ch):
    if isUpper(ch):
        return chr(ord(ch)-ord('A')+ord('a'))
    else:
        return ch

# Converst all uppercase letters in strn into lowercase and 
# leaves everything else unchanged.
def toLowerStr(strn):
    lower = ""
    for ch in strn:
        lower += toLower(ch)
    return lower

Then you can write the new function in a similar way to the function toLowerStr but where you test if the character is a lowercase letter, uppercase, and other. Lowercase letters are just added, uppercase letters are converted to lowercase and then added, and everything else is not added to the new string.

Ex. 2. Write a program that plays the rock-paper-scissors game with the user.

a. For this, write a function that plays one R-P-S game with the user, called rockPaperScissors, taking no parameters. This function should ask the user to enter their choice. Input this choice into a variable userChoice, then call the function cleanLowerWord defined at exercise 1 and assign the result back to the same variable.

After that, declare a variable n and assign to it randint(1,3). Then assign either "rock", "paper", "scissors" to a variable myChoice by doing

myChoice = choice(("rock", "paper", "scissors")) .

Note that choice is another function from the module random

Then you need a conditional that compares the user choice with my choice. If the two of them are equal, then print that it's a draw. Otherwise (use an elif) if the user choice is "rock" and my choice is "scissors", print that the user wins. The rules are:

• rock beats scissors
• scissors beats paper
• paper beats rock
• b. Write a piece of code at the end to test the function. Make this game play in a loop where after each run of the game, you ask the user if they want to play again, input the answer as "yes" or "no", and keep going while the answer is not "no"

Answer 1

As per our guidelines, we can answer only the first question. please ask the 2nd qtn seperately, if required....

for having any kind of doubt, please leave a comment in the comment box.... thank you...

Please check out the code with the output. In this python program, one function and the main was missing... After writing those, the final answer is

code....

def isLower(ch):           #returns true of the character is in lower case else returns falls
        return 'a' <= ch and ch <= 'z'
def isUpper(ch):        #returns true of the character is in upper case else returns falls
        return 'A' <= ch and ch <= 'Z'
def toLower(ch):     #converts the character to lower case
        if isUpper(ch):   #checking if the is in upper case
                return chr(ord(ch)-ord('A')+ord('a'))    #if so,then converting to lower case
        else:
                return ch    #else do nothing  i.e. character is already in lower case
def toLowerStr(strn):   #converts the whole string to lower case
        lower = ""
        for ch in strn:    #for every character in the string strn
                lower += toLower(ch)     
        return lower
def cleanLowerWord(strn):    #ADDED  
        st=""   #temporary string variable
        for ch in strn:
                if isUpper(ch) or isLower(ch):   #i.e. if the character is Alphabet then add it to new string else ignore/delete
                        st+=ch
        return toLowerStr(st)    #calling toLower() and returning it
ch=input("Enter String : ")
print(cleanLowerWord(ch))

OUTPUT

import  random
def isLower(ch):           #returns true of the character is in lower case else returns falls
        return 'a' <= ch and ch <= 'z'
def isUpper(ch):        #returns true of the character is in upper case else returns falls
        return 'A' <= ch and ch <= 'Z'
def toLower(ch):     #converts the character to lower case
        if isUpper(ch):   #checking if the is in upper case
                return chr(ord(ch)-ord('A')+ord('a'))    #if so,then converting to lower case
        else:
                return ch    #else do nothing  i.e. character is already in lower case
def toLowerStr(strn):   #converts the whole string to lower case
        lower = ""
        for ch in strn:    #for every character in the string strn
                lower += toLower(ch)
        return lower
def cleanLowerWord(strn):    #ADDED
        st=""   #temporary string variable
        for ch in strn:
                if isUpper(ch) or isLower(ch):   #i.e. if the character is Alphabet then add it to new string else ignore/delete
                        st+=ch
        return toLowerStr(st)    #calling toLower() and returning it
while(1):   #game loop
        ch=input("Enter your choice : ")  #rock/paper/scissors
        ch=cleanLowerWord(ch)   #calling function to lower case
        myChoice = random.choice(("rock","paper","scissors"))   #it will generate random string b/w these three
        if ch==myChoice:   #if both are same
                print("Draw")
        elif (ch=="rock" and myChoice=="scissors") or (ch=="scissors" and myChoice=="paper") or (ch=="paper" and myChoice=="rock"):
                print("User wins")
        else:
                print("Computer wins")
        c=input("Do you want to continue? yes/ no ")   #asking user
        c=cleanLowerWord(c)
        if c=="no":
                break

output