Print output in a single line

Question

Hello!

I have the following code:

>>> x = 0
>>> y = 3
>>> while x < y:
    ... print '{0} / {1}, '.format(x+1, y)
    ... x += 1

Output:

1 / 3, 
2 / 3, 
3 / 3, 

I want my output like:

1 / 3, 2 / 3, 3 / 3 

I searched and found that the way to do this in a single line would be:

sys.stdout.write('{0} / {1}, '.format(x+1, y))

Is there another way of doing it? I don't exactly feel comfortable with sys.stdout.write() since I have no idea how it is different from print.

Answer 1

you can use

print "something",

(with a trailing comma, to not insert a newline), so try this

... print '{0} / {1}, '.format(x+1, y), #<= with a ,

Answer 2

No need for write.

If you put a trailing comma after the print statement, you'll get what you need.

Caveats:

• You will need to add a blank print statement at the end if you want the next text to continue on a new line.
• May be different in Python 3.x
• There will always be at least one space added as a separator. IN this case, that is okay, because you want a space separating it anyway.

Answer 3

>>> while x < y:
...     print '{0} / {1}, '.format(x+1, y),
...     x += 1
... 
1 / 3,  2 / 3,  3 / 3, 

Notice the additional comma.

Answer 4

I think that sys.stdout.write() would be fine, but the standard way in Python 2 is print with a trailing comma, as mb14 suggested. If you are using Python 2.6+ and want to be upward-compatible to Python 3, you can use the new print function which offers a more readable syntax:

from __future__ import print_function
print("Hello World", end="")

Answer 5

You can use , in the end of print statement.

while x<y:
    print '{0} / {1}, '.format(x+1, y) ,
    x += 1

You can further read this.

Answer 6

Here is a way to achieve what you want using itertools. This will also work ok for Python3 where print becomes a function

from itertools import count, takewhile
y=3
print(", ".join("{0} /  {1}".format(x,y) for x in takewhile(lambda x: x<=y,count(1))))

You may find the following approach is easier to follow

y=3
items_to_print = []
for x in range(y):
    items_to_print.append("{0} /  {1}".format(x+1, y))
print(", ".join(items_to_print))

The problems with using print with a trailing comma are that you get an extra comma at the end, and no newline. It also means you have to have separate code to be forward compatible with python3