Printing with raw_input
in [Python]
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From: Joan Miller on 15 Feb 2010 04:23 Does `raw_input` uses internally `sys.stdout.write`?
From: Peter Otten on 15 Feb 2010 05:11 Joan Miller wrote: > Does `raw_input` uses internally `sys.stdout.write`? You can test this yourself without reading the C source: Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55) [GCC 4.4.1] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> class A: .... def write(self, s): .... sys.__stdout__.write(s.upper()) .... >>> sys.stdout = A() >>> print "yadda" YADDA >>> raw_input("foo") FOObar 'BAR' Peter
From: Joan Miller on 15 Feb 2010 06:40 On 15 feb, 10:11, Peter Otten <__pete...(a)web.de> wrote: > Joan Miller wrote: > > Does `raw_input` uses internally `sys.stdout.write`? > > You can test this yourself without reading the C source: > > Python 2.6.4 (r264:75706, Dec 7 2009, 18:43:55) > [GCC 4.4.1] on linux2 > Type "help", "copyright", "credits" or "license" for more information.>>> import sys > >>> class A: > > ... def write(self, s): > ... sys.__stdout__.write(s.upper()) > ...>>> sys.stdout = A() > >>> print "yadda" > YADDA > >>> raw_input("foo") > > FOObar > 'BAR' > > Peter It was to display the output inside a GUI app. overriding `sys.stdout`. And as `print` also uses internally `sys.stdout.write` then can be used `print` the shell script and get the output too in the GUI, cann't it?
From: Peter Otten on 15 Feb 2010 07:05 Joan Miller wrote: >> > Does `raw_input` uses internally `sys.stdout.write`? > It was to display the output inside a GUI app. overriding > `sys.stdout`. And as `print` also uses internally `sys.stdout.write` > then can be used `print` the shell script and get the output too in > the GUI, cann't it? It should be easy to collect data written with print and show it in a gui, but I can't see how you would integrate raw_input() into a gui app. As to shell scripts, you can invoke them via subprocess, or, if the script needs user interaction, via pexpect. Peter
From: Peter Otten on 16 Feb 2010 03:55
Shashwat Anand wrote: > raw_input uses sys.stderr I guess ? I had a look at the C code, but it's a bit confusing. If I'm reading it correctly the prompt is written to the "real" stderr if and only if sys.stdin and sys.stdout are attached to a terminal. $ python -c"raw_input('prompt\n')" 2>tmp.txt foo $ cat tmp.txt prompt $ python -c"raw_input('prompt\n')" 2>tmp.txt | cat foo prompt $ cat tmp.txt I wonder if that is intentional. Peter |