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[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@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@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.