Python comparing input with boolean expressions

Question

New to python. I'm writing this code and I can't for the life of me get my program to print the else statement (yourName, 'needs practise') when the input for swim and cycling is a combination of 'Y' and 'N'. what am I doing wrong?

def main():

    yourName = input("What is the your name? ")
    swim = input("Can you swim <Y>es or <N>o? ")
    cycling = input("Can you cycle <Y>es  or <N>o? ")

    if swim and cycling is 'Y' or swim and cycling is 'y':
            print(yourName, 'is an athlete.')
    elif swim and cycling is 'N' or swim and cycling is 'n':
        print(yourName,'shows potential.')
    else:
        print(yourName,'needs practise')

main()

Yeah. So if both inputs are 'y' then the person will be an athlete. If both are 'n' then they need practise but if one of the inputs is a 'y' and the other is a 'n' then i want the potential statement to show.. — Tom
– Tom, Commented Jun 5, 2016 at 18:52

rkatkam · Accepted Answer · 2016-06-05 18:43:14Z

1

You need to change the condition as:

 if swim is 'Y' and cycling is 'Y' or swim is 'y' and cycling is 'y':

In python, for the above example, If swim: will mean whether swim exists, which in this case is true.

edited Jun 5, 2016 at 18:43

answered Jun 5, 2016 at 18:39

rkatkam

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1 Comment

rkatkam Over a year ago

Since its an input, it will be string if entered. So False case would not come here. I think so. But thanks, I amde an edit that make the statement specific to the problem.

gaganso · Accepted Answer · 2016-06-05 18:57:57Z

0

You can do it this way:

if swim.lower() == <char> <conditional operator> cycling.lower() == <char> :

Where char is 'y' or 'n'.

def main():

    yourName = input("What is the your name? ")
    swim = input("Can you swim <Y>es or <N>o? ")
    cycling = input("Can you cycle <Y>es  or <N>o? ")

    is_swim = swim.lower()
    is_cycle = cycling.lower()

    if is_swim == 'y' and is_swim == 'y':
            print(yourName, 'is an athlete.')
    elif is_swim == 'y' or is_cycle == 'y':
        print(yourName,'shows potential.')
    else:
        print(yourName,'needs practise')

main()

str.lower() converts the string to lowercase.

edited Jun 5, 2016 at 18:57

answered Jun 5, 2016 at 18:50

gaganso

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2 Comments

Tom Over a year ago

Could you please explain in greater deatial? How would I write that with my variables etc?

Tom Over a year ago

Thanks @SilentMonk. Much appreciated

Jeremy Gordon · Accepted Answer · 2016-06-05 18:51:36Z

0

You haven't made your desired logic totally clear here, but if goal is to print 'shows potential' if yes to either swims or cycles, 'is an athlete' if both, and 'needs practice' if neither, the below code is a more readable option.

def main():

    yourName = input("What is the your name? ")
    swim = input("Can you swim <Y>es or <N>o? ")
    cycling = input("Can you cycle <Y>es  or <N>o? ")

    swims = swim and swim.upper() == "Y"
    cycles = cycling and cycling.upper() == "Y"

    if swims and cycles:
        print(yourName, 'is an athlete.')
    elif (swims or cycles):
        print(yourName,'shows potential.')
    else:
        print(yourName,'needs practise')

main()

answered Jun 5, 2016 at 18:51

Jeremy Gordon

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2 Comments

Tom Over a year ago

Thanks Jeremy that's exactly what I was looking for. Thank you

Jeremy Gordon Over a year ago

Great @Tom, if this answers your question please accept it.

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