[ python-Bugs-1633941 ] for line in sys.stdin: doesn't notice EOF the first time

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Bugs item #1633941, was opened at 2007-01-12 07:34
Message generated for change (Comment added) made by gagenellina
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Category: Python Library
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Matthias Klose (doko)
Assigned to: Nobody/Anonymous (nobody)
Summary: for line in sys.stdin: doesn't notice EOF the first time 

Initial Comment:
[forwarded from http://bugs.debian.org/315888]

for line in sys.stdin: doesn't notice EOF the first time when reading from tty.

The test program:

    import sys
    for line in sys.stdin:
            print line,
    print "eof"

A sample session:

    liw at esme$ python foo.py
    foo         <--- I pressed Enter and then Ctrl-D
    foo         <--- then this appeared, but not more
    eof         <--- this only came when I pressed Ctrl-D a second time
    liw at esme$

Seems to me that there is some buffering issue where Python needs to
read end-of-file twice to notice it on all levels. Once should be 
enough.



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Comment By: Gabriel Genellina (gagenellina)
Date: 2007-01-14 01:20

Message:
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user_id=479790
Originator: NO

Same thing occurs on Windows. Even worse, if the line does not end with
CR, Ctrl-Z (EOF in Windows, equivalent to Ctrl-D) has to be pressed 3
times:

D:\Temp>python foo.py
foo  <--- I pressed Enter
^Z   <--- I pressed Ctrl-Z and then Enter again
foo  <--- this appeared
^Z   <--- I pressed Ctrl-Z and then Enter again
<EOF>

D:\Temp>python foo.py
foo^Z   <--- I pressed Ctrl-Z and then Enter
^Z      <--- cursor stays here; I pressed Ctrl-Z and then Enter again
^Z      <--- cursor stays here; I pressed Ctrl-Z and then Enter again
foo <EOF>


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1633941&group_id=5470