On 2010-04-15 18:08 PM, Dave W. wrote:
I naively thought I could capture output from exec()'ed print
invocations by (somehow) overriding 'print' globally. But this
seems not to be possible. Or at least not easy:
c:\d>test.py
Python 2.6.2 (r262:71605, Apr 14 2009, 22:40:02) [MSC v.1500 32 bit
(Intel)] win32
Type "help", "copyright", "credits" or "license" for more info.
print("Hello?")
Hello?
My custom print function isn't being called (see code below),
I guess because its only being overridden in the current module?
Is there some way to make InteractiveInterpreter/exec use my print
function, or is this simply not possible?
----------
### File test.py ###
from __future__ import print_function
import sys
from code import InteractiveInterpreter
from contextlib import contextmanager
def printhook(*args):
sys.stdout.write("printhook(): {0}\n".format(repr(args[0])))
@contextmanager
def global_printhook(printhook):
global print
print = printhook
yield
print = __builtins__.print
old_print = __builtins__.print
__builtins__.print = printhook
yield
__builtins__.print = old_print
But you really should replace sys.stdout and sys.stderr instead.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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