stdin, stdout, redmon

Rolf van de Krol python at rolfvandekrol.nl
Mon Jan 21 15:52:59 CET 2008


I don't know what you did with your Python installation, but for me this 
works perfectly.

test3.py contains:
<code>
import sys

print sys.stdin.readlines()
</code>

test.txt contains:
<code>
Testline1
Testline2
</code>

Output of 'python test3.py < test.txt' is:
<code>
['Testline1\n', 'Testline2']
</code>

Just plain simple and just works.

Rolf



Bernard Desnoues wrote:
> Rolf van de Krol a écrit :
>   
>> According to various tutorials this should work.
>>
>> <code>
>> |import sys
>> data = sys.stdin.readlines()
>> print "Counted", len(data), "lines."|
>> </code>
>>
>> Please use google before asking such questions. This was found with only 
>> one search for the terms 'python read stdin'
>>
>> Rolf
>>
>> Bernard Desnoues wrote:
>>     
>>> Hi,
>>>
>>> I've got a problem with the use of Redmon (redirection port monitor). 
>>> I intend to develop a virtual printer so that I can modify data sent 
>>> to the printer.
>>> Redmon send the data flow to the standard input and lauchs the Python 
>>> program which send modified data to the standard output (Windows XP 
>>> and Python 2.5 context).
>>> I can manipulate the standard output.
>>>
>>> "import sys
>>> sys.stdout.write(data)"
>>>
>>> it works.
>>> But how to manipulate standard input so that I can store data in a 
>>> string or in an object file ? There's no "read" method.
>>>
>>> "a = sys.stdin.read()" doesn't work.
>>> "f = open(sys.stdin)" doesn't work.
>>>
>>> I don't find anything in the documentation. How to do that ?
>>> Thanks in advance.
>>>
>>> Bernard Desnoues
>>> Librarian
>>> Bibliothèque de géographie - Sorbonne
>>>       
>
> Hello Rolf,
>
> I know this code because I have search a solution !
> Your google code doesn't work ! No attribute "readlines".
>
>  >>> import sys
>  >>> data = sys.stdin.readlines()
>
> Traceback (most recent call last):
>    File "<pyshell#1>", line 1, in <module>
>      data = sys.stdin.readlines()
> AttributeError: readlines
>   



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