[Scons-users] tool located in site_scons\site_tools\toolname causes ImportError

Bill Deegan bill at baddogconsulting.com
Mon Feb 4 11:42:15 EST 2019 

SCons manual shouldn't say py3 is not supported yet. It's been supported
since SCons 3.0.0, although we're finding some issues as users actually
start using it.
(Where in the manual does it say not supported because that's a bug..)


On Mon, Feb 4, 2019 at 3:41 AM Arndt Pauschardt <arndt.pauschardt at web.de>
wrote:

> Hi, Bill
> thanks for looking into this.
> a) Yes, we have a work-around. The background of all this is an effort to
> retire Python 2.7, scons is the last "tool" in our eco-system which relies
> on 2.7, so we would like to migrate to 3.7. So, yes, it works under 2.7 and
> we could fix it for 3.7, but I admit that I prefer the
> site_scons\site_tools hierarchy approach over "dumping" all tools into
> site_scons.
> I'm aware of the fact that the SCons manual says that Py3 is not supported
> yet, but following this mailing list seems to indicate that using Py3 is no
> longer a high risk thing.
>
> b) I have seen the exact same problem with MSYS2. There, I believed for a
> while that it would be caused by an "incomplete" package install:
> pacman'ing python 3, then pip'ing scons into an MSYS2 installation has a
> problem with the shebang in the "scons" script , it needs to be tweaked.
> Then, it seems to work, but fails with the same import error.
>
> I have not tried Win10, Debian/Raspbian yet - these would be the platforms
> I have within reasonable reach.
>
> Cheers
> Arndt
>
> *Gesendet:* Freitag, 01. Februar 2019 um 15:53 Uhr
> *Von:* "Bill Deegan" <bill at baddogconsulting.com>
> *An:* "SCons users mailing list" <scons-users at scons.org>
> *Betreff:* Re: [Scons-users] tool located in
> site_scons\site_tools\toolname causes ImportError
> Let me see if I can reproduce it here.
> Also curious if it affects py3.5, py3.6 and non-windows platforms.
>
> Looks like you have a workaround so you're not stuck (for the moment).
> -Bill
> SCons Project Co-manager.
>
> On Fri, Feb 1, 2019 at 4:21 AM Arndt Pauschardt <arndt.pauschardt at web.de>
> wrote:
>
>> Hi, *
>> this is my 1st mail to this list, so pls let me know any
>> 'code-of-conduct' violations ... :-)
>>
>> 1. I have installed WinPython 3.7.10 on a Win7 64bit machine and
>> pip-installed scons into this:
>>
>> E:\rfs_projects\test>python -VV
>> Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:57:15) [MSC v.1915 64
>> bit (AMD64)]
>> E:\rfs_projects\test>scons --version
>> SCons by Steven Knight et al.:
>>         script: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864,
>> 2019-01-20 22:51:36, by bdeegan on kufra
>>         engine: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864,
>> 2019-01-20 22:51:36, by bdeegan on kufra
>>         engine path:
>> ['e:\\wpy-3710\\python-3.7.1.amd64\\lib\\site-packages\\scons\\SCons']
>> Copyright (c) 2001 - 2019 The SCons Foundation
>>
>>
>> 2. I'm running the following SConstruct
>>
>> env = Environment()
>> env.Tool('astyle')
>>
>> 2.1 in site_scons\site_tools\astyle I have an __init__.py and an
>> astyle.py:
>> __init__.py:
>> from astyle import generate
>> from astyle import exists
>>
>> astyle.py :
>> import os
>> from SCons.Script import *
>> def generate(env, **kw):
>>     astyle_path = os.path.join(kw.get('TOOL_DIR', ''), 'AStyle')
>>     env.PrependENVPath('PATH', astyle_path)
>>     ASTYLECOM='astyle --verbose '
>>     env['ASTYLE_OPTS'] = kw.get('OPTS')
>>     import SCons.Builder
>>     # cmd line options, taken from the docu for your convenience
>>     # --ascii               output is ascii chars (and not localized or
>> whatever), output is English
>>     astyle_bld = SCons.Builder.Builder(action=['@echo formatting $SOURCE',
>>                                                ASTYLECOM+
>>                                                '--options=$ASTYLE_OPTS '
>>                                                '--ascii '
>>                                                '$SOURCE > $TARGET'
>>                                                ],
>>                                        suffix='.astyle'
>>                                        )
>>     env.Append(BUILDERS={'astyle_C': astyle_bld})
>>     return
>> def exists(env):
>>     return 0
>>
>>
>> 3. Running this (e.g. scons -h) causes an ImportError:
>> E:\rfs_projects\test>scons -h
>> scons: Reading SConscript files ...
>> ImportError: cannot import name 'generate' from 'astyle'
>> (E:\rfs_projects\test\site_scons\site_tools\astyle\__init__.py):
>>   File "E:\rfs_projects\test\SConstruct", line 2:
>>     env = Environment(tools = ['astyle'])
>>   File
>> "e:\wpy-3710\python-3.7.1.amd64\lib\site-packages\scons\SCons\Environment.py",
>> line 982:
>>     apply_tools(self, tools, toolpath)
>>   File
>> "e:\wpy-3710\python-3.7.1.amd64\lib\site-packages\scons\SCons\Environment.py",
>> line 107:
>>     env.Tool(tool)
>>   File
>> "e:\wpy-3710\python-3.7.1.amd64\lib\site-packages\scons\SCons\Environment.py",
>> line 1788:
>>     tool = SCons.Tool.Tool(tool, toolpath, **kw)
>>   File
>> "e:\wpy-3710\python-3.7.1.amd64\lib\site-packages\scons\SCons\Tool\__init__.py",
>> line 117:
>>     module = self._tool_module()
>>   File
>> "e:\wpy-3710\python-3.7.1.amd64\lib\site-packages\scons\SCons\Tool\__init__.py",
>> line 232:
>>     module = spec.loader.load_module(spec.name)
>>   File "<frozen importlib._bootstrap_external>", line 407:
>>   File "<frozen importlib._bootstrap_external>", line 907:
>>   File "<frozen importlib._bootstrap_external>", line 732:
>>   File "<frozen importlib._bootstrap>", line 265:
>>   File "<frozen importlib._bootstrap>", line 696:
>>   File "<frozen importlib._bootstrap>", line 677:
>>   File "<frozen importlib._bootstrap_external>", line 728:
>>   File "<frozen importlib._bootstrap>", line 219:
>>   File "E:\rfs_projects\test\site_scons\site_tools\astyle\__init__.py",
>> line 1:
>>     from astyle import generate
>>
>>
>> 4. Running the exact same SConstruct (and site_scons\..) from a
>> WinPy2.7.13 (with pip'ed scons 3.0.4) does not cause a problem.
>> 5. Renaming site_scons\site_tools\astyle to astyle_1 (to take it out) and
>> moving astyle.py into site_scons\ fixes the issue for the WinPython 3.7.
>>
>> I'm not sure what I'm doing wrong, I have been trying to google-read on
>> this "ImportError", but I did not find anything which seems to explain this.
>>
>> Thx for any help on this
>> Arndt
>>
>>
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>
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