where the extra space comes from on the stdout

[alf]

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?

 

[Steve Holden]

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

 

[Gabriel G]

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

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.

You could try using
print '\rQuestion?',


Gabriel Genellina
Softlab SRL





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[Simon Percivall]

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?

You already got the answer, but as for the rest: It's really easier for
you if you use raw_input() for your question/input pair instead.

 

[alf]

You already got the answer, but as for the rest: It's really easier for
you if you use raw_input() for your question/input pair instead.

thx, this is what I was looking for, alf