exec() with StringIO() in python

Asked Jan 12 '16 at 01:07

Active Jan 12 '16 at 01:13

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I would like to change the standard output from a terminal to a string. I could use the instruction by Frédéric Hamidi in the web page: python: get the print output in an exec statement , and it works. However, if I would like to run ping command, I couldn't reach to specific char in in the string. there is an error which is "IndexError: string index out of range" I would be grateful if you can help me with this problem.

Thanks a lot Anees

The code:

import sys
from cStringIO import StringIO
import subprocess

code2 ="""
subprocess.call(['ping','www.google.com','-n','1'])
"""

old_stdout = sys.stdout
redirected_output = sys.stdout = StringIO()
exec(code2)
sys.stdout = old_stdout
x= redirected_output.getvalue()
print x
print x[10]
redirected_output.close()

edited May 23 '17 at 12:31

Community

asked Jan 12 '16 at 01:07

Anees

1

You're putting python code in a string and then trying to exec it. Use subprocess or exec, not both at once, that makes no sense. – pvg Jan 12 '16 at 01:14
What was wrong with just calling `subprocess.call(['ping', 'www.google.com', '-n', '1'])`? – Zizouz212 Jan 12 '16 at 01:42
You got len(x) is 0. – caot Jan 12 '16 at 01:45

exec() with StringIO() in python

0 Answers0