where the extra space comes from on the stdout

[Steve Holden]

alf wrote:
> Hi,
> 
> I can not find out where the extra space comes from. Run following:
> 
> import os,sys
> while 1:
>      print 'Question [Y/[N]]?',
>      if sys.stdin.readline().strip() in ('Y','y'):
>          #do something
>          pass
> 
> $ python q.py
> Question [Y/[N]]?y
>   Question [Y/[N]]?y
>   Question [Y/[N]]?y
>   Question [Y/[N]]?y
>   Question [Y/[N]]?n
>   Question [Y/[N]]?
>   Question [Y/[N]]?
> 
> 
> There is a space evrywhere just before Q
> 
> Any insight?
> 
Yup. When you execute a print statement with a comma at the end it 
doesn't output the space, it simply sets a flag reminding it that there 
should be a space before the next item on the same line. If the next 
character out is a newline then the space flag is reset, but in this 
case the newline was provided by the input, so you get a space at the 
start of the next output.

regards
  Steve
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