while loop back to start of program

Question

I'm trying to create a loop in order to bring the user back to the beginning of the program. I can't get it to print "Welcome to the comparison function". The program will run, asking user for input 1 and 2 and then will print the answer of the comparison, but I can not figure out how to get it to start over.

def comparison():
    loop = True
    while (loop):
        print(" Welcome to the comparison function")
    a = int (input("Enter your first number for value a, then hit enter key:"))
    b = int (input("Enter your second number for value b, then hit enter key:"))
    def compare (a,b):
        if a>b:
            return 1
        elif a==b:
            return 0
        else:
            return -1
    answer = compare(a,b)
    print (answer)
    while True:
    response=input ("Would you like to perform another comparison? (yes/no)")
    if response=="yes" or response =="YES" or response =="Yes":
        print ("Thank you!")
        break
    elif response=="no" or response=="NO" or response =="No":
        loop=False
        print ("Thank you, have a great day!")
        break
    else:
        continue

Yeah, please edit your post so that it has the correct indentation as it appears in your code. — Denziloe
– Denziloe, Commented Mar 8, 2017 at 20:13
This code works fine when properly indented... so your issue is indentation. — TemporalWolf
– TemporalWolf, Commented Mar 8, 2017 at 20:14
Assuming the indentation is fine in your code (it wouldn't run for you at all otherwise), what version of Python are you using? I can get it to run fine in Python 2 but it requires changing input to raw_input. — roganjosh
– roganjosh, Commented Mar 8, 2017 at 20:15

TemporalWolf · Accepted Answer · 2017-03-08 22:14:47Z

This would be a drop in replacement for your function in Python 3:

def comparison():
    while True:
        print("Welcome to the comparison function")
        a = int(input("Enter your first number for value a, then hit enter key:"))
        b = int(input("Enter your second number for value b, then hit enter key:"))

        # Recommended replacement for cmp(a, b) in Python 3
        # https://docs.python.org/3.0/whatsnew/3.0.html#ordering-comparisons
        answer = (a > b) - (a < b) 
        print(answer)

        response = input("Would you like to perform another comparison? (yes/no)")
        while response.lower() not in ['yes', 'no']:
            response = input("please enter proper response: ")

        if response.lower() == "yes":
            print("Thank you!")
        else:
            print("Thank you, have a great day!")
            break

comparison()

Bhargav · Accepted Answer · 2017-03-08 23:17:43Z

0

def comparision():
    loop = True
    while loop:
            print ("welcome to the comparision function: ")
            a = int(input(("Enter your number for a value a , then hit enter key:")))
            b = int (input("Enter your second number for value b, then hit enter key:"))
            answer = ''
            if a > b:
                answer = 1
            elif a == b:
                answer = 0
            else:
                answer = -1
            print (answer)
            response = str(input("Would you like to perform another comparison? (yes/no) :"))

            while response.lower() not in ['yes', 'no']:
                response = str(input("please enter proper response: "))

            if response.lower() == 'yes'
                continue
            elif response.lower() == 'no' 
                print ("Thank you, have a great day!")
                break

if __name__ == '__main__':
    comparision()

if you are using python 2.7:

response = str(raw_input("Would you like to perform another comparison? (yes/no) :"))

Hope this helps. Thanks

edited Mar 8, 2017 at 23:17

answered Mar 8, 2017 at 21:36

Bhargav

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14 Comments

TemporalWolf Over a year ago

You also removed the inner loop for choosing whether to go again... this is not a functionally equivalent program.

Bhargav Over a year ago

sorry my bad in pasting the code here. Edited@roganjosh

Bhargav Over a year ago

@TemporalWolf Do we need inner loop here ?

StacyB Over a year ago

Thank you so much for your help! Can you please explain what changes you made so I don't make the same mistake next time? @Bhargav

Bhargav Over a year ago

I removed inner function compare and removed one more while True condition to optimize. Please mark the answer if it worked for u please look for indentation aswell@StacyB. Thanks

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