how to use multiple boolean operators with list

Question

I am fairly new to coding but stuck on one of these exercises;

"Write a program that accepts a date in the format DD/MM/YYYY and output whether or not the date is valid. For example 20/07/1969 is valid, but 31/09/2012 is not."

My attempt at this:

d = int(input("Enter a day"))
m = int(input("Enter a month"))
y = int(input("Enter a year"))

if d > 30 and m == [4, 6, 9, 11]:
     print("This date is invalid")

elif d > 31:
     print ("This date is invalid")

elif m != [1,2,3,4,5,6,7,8,9,10,11,12]:
     print ("This date is invalid")

else:
     print("This date is valid")

Any suggestions on how to fix this is appreciated

I would use the date object of the datetime module. Probably not allowed, but here you also have to take leap years into account, etc. and some calendars even changed through time, making it very hard to parse it correctly without any error. For example, before 8 BC, a leap year took place every three years. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Oct 9, 2018 at 21:06
What is probably also missing is the fact that you get one string, separated with slashes, and thus you have to "split" it into three parts. — willeM_ Van Onsem
– willeM_ Van Onsem, Commented Oct 9, 2018 at 21:06

Sheldore · Accepted Answer · 2018-10-09 21:07:10Z

2

You were close. Just modifying your code, the correct implementation of checking an entry m against multiple options, it would look like the following. To check for multiple options, you use in, for ex. if m in [4, 6, 9, 11] instead of ==.

if d > 30 and m in [4, 6, 9, 11]:
     print("This date is invalid")
elif d > 31:
     print ("This date is invalid")
elif m not in [1,2,3,4,5,6,7,8,9,10,11,12]:
     print ("This date is invalid")
else:
     print("This date is valid")

answered Oct 9, 2018 at 21:07

Sheldore

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Adam Smith · Accepted Answer · 2018-10-09 21:07:22Z

1

To check membership in a list, use the in operator.

if d > 30 and m in [4, 6, 9, 11]:

answered Oct 9, 2018 at 21:07

Adam Smith

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