On 09:15 pm, ch...@simplistix.co.uk wrote:
Hi All,
I have this simple function:
def execute(command):
process = Popen(command.split(),stderr=STDOUT,stdout=PIPE)
return process.communicate()[0]
..but my unit test for it fails:
from testfixtures import tempdir,compare
from unittest import TestCase
class TestExecute(TestCase):
@tempdir()
def test_out_and_err(self,d):
path = d.write('test.py','\n'.join((
"import sys",
"sys.stdout.write('stdout\\n')",
"sys.stderr.write('stderr\\n')",
"sys.stdout.write('stdout2\\n')",
)),path=True)
compare('stdout\nstderr\nstdout2\n',
execute(sys.executable+' '+path))
...because:
AssertionError:
@@ -1,4 +1,4 @@
-stdout
-stderr
-stdout2
+stdout
+stdout2
+stderr
...the order of the writes isn't preserved.
How can I get this to be the case?
You probably just need to flush stdout and stderr after each write. You
set them up to go to the same underlying file descriptor, but they still
each have independent buffering on top of that.
Jean-Paul
--
http://mail.python.org/mailman/listinfo/python-list