Print value and next value of dict on same line during iteration with an odd number of items

Question

(Python 2.7) In my previous question, I was trying to iterate through the keys of the dictionary "rooms" and show only two keys per line, how can I go about showing an odd number of rooms at a time? More specifically, two per line until only one is left and only that one will go on a line on its own.

Previous Question

Current Code:

rooms = {
"101": "Classroom",
"102": "Bathroom",
"103": "Room",
"104": "Room",
"105": "Room",
"106": "Room"}


keys = iter(sorted(rooms.keys()))
for key in keys:
    print key + "    " + next(keys)

Current Output:

101    102
103    104
105    106

Goal Output:

How's that possible if you have an even number of keys (like you do in your example dictionary)? — slider, Oct 31 '18 at 15:20

Steven Rumbalski · Answer 1 · 2018-10-31T15:29:48.320

1

next() takes an optional second argument for a default value to return when the iterator is exhausted.

keys = iter(sorted(rooms.keys()))
for key in keys:
    print key + "    " + next(keys, "")

edited Oct 31 '18 at 15:29

answered Oct 31 '18 at 15:28

Steven Rumbalski

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1

I'd suggest "" though – DonQuiKong Oct 31 '18 at 15:29

DonQuiKong · Answer 2 · 2018-10-31T15:30:08.507

0

rooms = {
"101": "Classroom",
"102": "Bathroom",
"103": "Room",
"104": "Room",
"105": "Room",
"106": "Room",
"107": "Room"}


keys = iter(sorted(rooms.keys()))
for key in keys:
    try:
        print(key + "    " + next(keys))
    except StopIteration:
        print(key)

Though it might be a lot simpler to make keys a list and just check if you've reached the end.

edited Oct 31 '18 at 15:30

answered Oct 31 '18 at 15:23

DonQuiKong

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score 0 · Answer 3 · answered Oct 31 '18 at 15:25

Alternatively use enumerate.

from __future__ import print_function

per_line = 2
keys = iter(sorted(rooms.keys()))
for i, key in enumerate(keys):
    if (i + 1) % per_line == 0 or (i + 1) == len(rooms.keys()):
        print(key)
    else:
        print(key, end="\t")

Print value and next value of dict on same line during iteration with an odd number of items

3 Answers3