François Beaune
2018-08-23 17:12:35 UTC
Hi,
I'm using scons v3.0.1 under Windows 10:
SCons by Steven Knight et al.:
script: v3.0.1.74b2c53bc42290e911b334a6b44f187da698a668, 2017/11/14
13:16:53, by bdbaddog on hpmicrodog
engine: v3.0.1.74b2c53bc42290e911b334a6b44f187da698a668, 2017/11/14
13:16:53, by bdbaddog on hpmicrodog
engine path:
['c:\\python36\\lib\\site-packages\\scons-3.0.1\\SCons']
Copyright (c) 2001 - 2017 The SCons Foundation
Under (and only under) Python 3.x, when the pywin32 Python module is
installed, scons wraps a number of classes from the io module
(io.BufferedReader, io.BufferedWriter, io.BufferedRWPair,
io.BufferedRandom, io.TextIOWrapper) in order to run some custom code when
they are constructed. This is done in SCons\Platform\win32.py lines 83-92.
I don't know the exact purpose of this, however it appears that SCons makes
the incorrect assumption that all classes it wraps have a fileno() method,
which is not the case for io.TextIOWrapper() when it wraps streams such as
io.StringIO or io.BytesIO.
Here is a minimal repro case, tested with scons v3.0.1, Python 3.6.5 and
pywin32 223:
import sys
import xml.etree.ElementTree as ET
def bob(env, target, source):
element = ET.Element("bob")
try:
ET.tostring(element, encoding="utf-8", method="xml")
except:
print(sys.exc_info())
env = Environment(
BUILDERS={
'bob': Builder(action=Action(bob))
})
env.bob("output", [])
Output:
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
bob(["output"], [])
(<class 'io.UnsupportedOperation'>, UnsupportedOperation('fileno',),
<traceback object at 0x00000297BAF30B08>)
scons: done building targets.
Best,
Franz
I'm using scons v3.0.1 under Windows 10:
SCons by Steven Knight et al.:
script: v3.0.1.74b2c53bc42290e911b334a6b44f187da698a668, 2017/11/14
13:16:53, by bdbaddog on hpmicrodog
engine: v3.0.1.74b2c53bc42290e911b334a6b44f187da698a668, 2017/11/14
13:16:53, by bdbaddog on hpmicrodog
engine path:
['c:\\python36\\lib\\site-packages\\scons-3.0.1\\SCons']
Copyright (c) 2001 - 2017 The SCons Foundation
Under (and only under) Python 3.x, when the pywin32 Python module is
installed, scons wraps a number of classes from the io module
(io.BufferedReader, io.BufferedWriter, io.BufferedRWPair,
io.BufferedRandom, io.TextIOWrapper) in order to run some custom code when
they are constructed. This is done in SCons\Platform\win32.py lines 83-92.
I don't know the exact purpose of this, however it appears that SCons makes
the incorrect assumption that all classes it wraps have a fileno() method,
which is not the case for io.TextIOWrapper() when it wraps streams such as
io.StringIO or io.BytesIO.
Here is a minimal repro case, tested with scons v3.0.1, Python 3.6.5 and
pywin32 223:
import sys
import xml.etree.ElementTree as ET
def bob(env, target, source):
element = ET.Element("bob")
try:
ET.tostring(element, encoding="utf-8", method="xml")
except:
print(sys.exc_info())
env = Environment(
BUILDERS={
'bob': Builder(action=Action(bob))
})
env.bob("output", [])
Output:
scons: Reading SConscript files ...
scons: done reading SConscript files.
scons: Building targets ...
bob(["output"], [])
(<class 'io.UnsupportedOperation'>, UnsupportedOperation('fileno',),
<traceback object at 0x00000297BAF30B08>)
scons: done building targets.
Best,
Franz