How to send EOF to Python sys.stdin from commandline? CTRL-D doesn't work
Control-D should NOT make your program "just stop" -- it should close standard input, and if your program deals with that properly, it may perfectly well continue if it needs to!
For example, given the following st.py
:
import sysdef main(): inwas = [] for line in sys.stdin: inwas.append(line) print "%d lines" % len(inwas), print "initials:", ''.join(x[0] for x in inwas)if __name__ == '__main__': main()
we could see something like
$ python st.pynel mezzo del cammin di nostra vitami ritrovai per una selva oscurache la diritta via era smarrita3 lines initials: nmc$
if the control-D is hit right after the enter on the third line -- the program realizes that standard input is done, and performs the needed post-processing, all neat and proper.
If your program prematurely exits on control-D, it must be badly coded -- what about editing you question to add the smallest "misbehaving" program you can conceive of, so we can show you exactly HOW you're going wrong?
If you use 'for l in sys.stdin', it is buffered.
You can use:
while 1: l = sys.stdin.readline()
I think I know what's happening. You are hitting ctrl-D
without hitting enter
. If you want to send a line to the program, just hit enter. If you hit ctrl-D
without hitting enter
, you can hit ctrl-D
again and your program should see the line then. In this case (two ctrl-D
s in succession), your program will not see a newline at the end of the line.
For example, let's say I have a Python script a.py
:
import sysfor line in sys.stdin: sys.stdout.write('%s' % line)
And I execute it:
$ python a.py
And then enter the following:
line 1line 2<ctrl-D><ctrl-D>
the program will print:
line 1line 2$
$
is the shell-prompt. Here's a full session with the above input:
$ python a.py
line 1
line 2 line1
line 2$
(Bold show the program's output. Roman-case is for showing what I typed, sans the two ctrl-D
s)
If this is not what's happening, you need to tell us more about what you are doing.