Excecute program with input

Question

I have a program which I want to execute in for loops with changing input.

import subprocess
for num in range(StartingPoint, EndingPoint):
 p = subprocess.Popen("C:\\Programming\\simple\\Simple_C\\bin\\Simple_C.exe",
                   shell=True,
                   stdin=subprocess.PIPE,
                   stdout=subprocess.PIPE)
 p.communicate(input='%d\n' % num)
output = p.communicate()[0]
print (output)

But I get this error:

TypeError: 'str' does not support the buffer interface

The program asks for a number and Python should give it "num", is there a better solution to this? I am using Python version 3.3.2.

simonzack · Accepted Answer · 2013-06-14 08:00:27Z

1

Use bytes instead

import subprocess
for num in range(StartingPoint, EndingPoint):
    p = subprocess.Popen("C:\\Programming\\simple\\Simple_C\\bin\\Simple_C.exe",
                shell=True,
                stdin=subprocess.PIPE,
                stdout=subprocess.PIPE)
    p.communicate(input=('%d\n'%num).encode())
    output = p.communicate()[0]
    print (output)

edited Jun 14, 2013 at 8:00

answered Jun 14, 2013 at 7:54

simonzack

21.2k14 gold badges82 silver badges125 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

gecco · Accepted Answer · 2013-06-14 08:09:48Z

0

According the python documentation you should pass bytes instead of string:

The type of input must be bytes or, if universal_newlines was True, a string.

Warning: If you encode non-asccii text, ensure you are using the correct encoding when converting to bytes.

answered Jun 14, 2013 at 8:09

gecco

19k11 gold badges53 silver badges68 bronze badges

Collectives™ on Stack Overflow

Excecute program with input

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related