Using string input for boolean

[tronic72]

Hi,

I've in the process of learning logical operators. I have the following code which works.

# high_income = input("Do you have a high income (yes/no)?: ")
# good_credit = input("Do you have good credit (yes/no)?: ")
# student = input("Are you a student (yes/no)?: ")
# if (high_income= or good_credit) and not student:
#     print ("Eligable")
# else:
#     print ("Not Eligable")

I'm working to modify the code to accept user input for the same outcome but this doesn't work.

high_income = input("Do you have a high income (yes/no)?: ")
good_credit = input("Do you have good credit (yes/no)?: ")
student = input("Are you a student (yes/no)?: ")

if high_income in (["yes"] or good_credit in ["yes"]): and not student in ["yes"]:
    print ("Eligable")
else:
    print ("Not Eligable")

However when I strip it down using a single variable input as a below it DOES work.

if high_income in (["yes"] or good_credit in ["yes"]): and not student in ["no"]:
    print ("Eligable")
else:
    print ("Not Eligable")

The outcome should be (Eligible) if high_income OR good_credit are True(yes) and NOT student. However the outcomes aren't what I would expect. I'm sure I've messed up somewhere but can't see why this won't work.

Thanks in advance.

[Gribouillis]

Your punctuation is incorrect. Use parentheses to make the expression clearer

if (high_income in ["yes"]) or (good_credit in ["yes"]) and (student not in ["yes"]):
    print ("Eligable")
else:
    print ("Not Eligable")

[tronic72]

Your punctuation is incorrect. Use parentheses to make the expression clearer

if (high_income in ["yes"]) or (good_credit in ["yes"]) and (student not in ["yes"]):
    print ("Eligable")
else:
    print ("Not Eligable")

Ah awesome! I knew it was something like that. I found a solution that worked using == operators as below.

high_income = input("Do you have a high income (yes/no)?: ")
good_credit = input("Do you have good credit (yes/no)?: ")
student = input("Are you a student (yes/no)?: ")

if high_income == ("yes") or good_credit == ("yes") and not student in ["yes"]:
    print ("Eligable")
else:
    print ("Not Eligable")

Is one either one of these solutions "better" than the other?

Thanks for your help!

[Gribouillis]

Is one either one of these solutions "better" than the other?

No, they are equally good. You could improve the user interaction by allowing answers like yes YES Yes y Y etc. Also you could provide a default, allowing the user to make a choice by just hitting the Return key.

def yesno_input(msg, default=True):
    end = "YES/no" if default else "yes/NO"
    x = input(f"{msg} ({end}) ").strip().lower()
    if not x:
        return default
    elif x in ("yes", "y"):
        return True
    elif x in ("no", "n"):
        return False
    else:
        raise ValueError(x)


has_high_income = yesno_input("Do you have a high income?")
has_good_credit = yesno_input("Do you have good credit?")
is_student = yesno_input("Are you a student?", default=False)

if has_high_income and has_good_credit and not is_student:
    print("Eligible")
else:
    print("Not Eligible")

Output:
Do you have a high income? (YES/no) y
Do you have good credit? (YES/no) 
Are you a student? (yes/NO) 
Eligible