python: get the print output in an exec statement

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Since Python 3.4 there is a solution is the stdlib: https://docs.python.org/3/library/contextlib.html#contextlib.redirect_stdout

from io import StringIO
from contextlib import redirect_stdout

f = StringIO()
with redirect_stdout(f):
    help(pow)
s = f.getvalue()

In older versions you can write a context manager to handle replacing stdout:

import sys
from io import StringIO
import contextlib

@contextlib.contextmanager
def stdoutIO(stdout=None):
    old = sys.stdout
    if stdout is None:
        stdout = StringIO()
    sys.stdout = stdout
    yield stdout
    sys.stdout = old

code = """
i = [0,1,2]
for j in i :
    print j
"""
with stdoutIO() as s:
    exec(code)

print("out:", s.getvalue())

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