How to repeat input after input is typed?

Question

I wrote a function that contains a dictionary of abbreviated week days to the full name of the day. I get the proper output day when I type in the abbreviation, but in order to try another abbreviation, I have to retype the function.

I have:

def weekday()
    day = input('Enter day abbreviation ' )
    days = {'Mo':'Monday','Tu':'Tuesday',
            'we':'Wednesday', 'Th':'Thursday',
            'Fr':'Friday', 'Sa':'Saturday','Su':Sunday'}
    while day in days:
        print(days.get(day))

The problem I have is that it prints the full day name over and over again, and instead I want it to print the full day name, then print 'Enter day abbreviation' again.

It should look like this:

>>>weekday():
Enter day abbreviation: Tu
Tuesday
Enter day abbreviation: Su
Sunday
Enter day abbreviation:
...

Instead, I get:

>>>weekday():
Enter day abbreviation: Tu
Tuesday
Tuesday
Tuesday
Tuesday
Tuesday
... # it continues without stopping

I know this is a really simple solution, but I can't figure it out.

possible duplicate of how to let a raw_input repeat until I wanna quit? — kirelagin
– kirelagin, Commented Jun 9, 2013 at 16:55

mishik · Accepted Answer · 2013-06-09 16:56:27Z

3

You never reread "day" so "while day in days" is always true and executing endlessly.

def weekday()
    day = input('Enter day abbreviation ' )
    days = {'Mo':'Monday','Tu':'Tuesday',
            'we':'Wednesday', 'Th':'Thursday',
            'Fr':'Friday', 'Sa':'Saturday','Su':'Sunday'}
    while day in days:
        print(days.get(day))
        day = input('Enter day abbreviation ' )

answered Jun 9, 2013 at 16:56

mishik

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1 Comment

M15671 Over a year ago

Thank you! I don't know why I didn't think of that. So simple

Rushy Panchal · Accepted Answer · 2013-06-09 16:56:54Z

2

You want to get input again in every iteration:

while True:
        day = input('Enter day abbreviation ' )
        acquired_day = days.get(day)
        if acquired_day is None: break
        print(acquired_day)

answered Jun 9, 2013 at 16:56

Rushy Panchal

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Comments

Ashwini Chaudhary · Accepted Answer · 2013-06-09 17:07:07Z

2

days = {'Mo':'Monday','Tu':'Tuesday',
        'we':'Wednesday', 'Th':'Thursday',
        'Fr':'Friday', 'Sa':'Saturday','Su':'Sunday'}
while True:
    day = input('Enter day abbreviation ' )
    if day in days:
        print (days[day])
    else:
        break

output:

$ python3 so.py
Enter day abbreviation Mo
Monday
Enter day abbreviation Tu
Tuesday
Enter day abbreviation we
Wednesday
Enter day abbreviation foo

Another way using dict.get:

days = {'Mo':'Monday','Tu':'Tuesday',
        'we':'Wednesday', 'Th':'Thursday',
        'Fr':'Friday', 'Sa':'Saturday','Su':'Sunday'}
obj = object()                             #returns a unique object
day = input('Enter day abbreviation ' )
while days.get(day,obj) != obj:
    print (days[day])
    day = input('Enter day abbreviation ' )

edited Jun 9, 2013 at 17:07

answered Jun 9, 2013 at 16:56

Ashwini Chaudhary

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1 Comment

zmo Over a year ago

he expect to quit if day is not in days, as the wrong while loop condition states...

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