bug宝典Python篇 environment can only contain strings

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本文记录了在Windows环境下使用scrapyd-deploy-peie时遇到的环境变量异常问题，表现为TypeError: environment can only contain strings错误，并附上了详细的错误日志。

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环境

python2.7.12
scrapyd-1.2.0
scrapyd-client-1.1.0

在windows环境下使用scrapyd-deploy -p eie的时候提示下面的异常

Packing version 1498207812
Deploying to project "eie" in http://localhost:6800/addversion.json
Server response (200):
{"status": "error", "message": "environment can only contain strings", "node_nam
e": "dzm-PC"}

scrapyd端的异常信息是

2017-06-23T16:49:33+0800 [Launcher] Scrapyd 1.2.0 started: max_proc=32, runner=u
'scrapyd.runner'
2017-06-23T16:50:13+0800 [_GenericHTTPChannelProtocol,0,127.0.0.1] Unhandled Err
or
        Traceback (most recent call last):
          File "d:\python27\lib\site-packages\twisted-16.5.0rc1-py2.7-win32.egg\
twisted\web\http.py", line 1845, in allContentReceived
            req.requestReceived(command, path, version)
          File "d:\python27\lib\site-packages\twisted-16.5.0rc1-py2.7-win32.egg\
twisted\web\http.py", line 766, in requestReceived
            self.process()
          File "d:\python27\lib\site-packages\twisted-16.5.0rc1-py2.7-win32.egg\
twisted\web\server.py", line 190, in process
            self.render(resrc)
          File "d:\python27\lib\site-packages\twisted-16.5.0rc1-py2.7-win32.egg\
twisted\web\server.py", line 241, in render
            body = resrc.render(self)
        --- <exception caught here> ---
          File "d:\python27\lib\site-packages\scrapyd\webservice.py", line 21, i
n render
            return JsonResource.render(self, txrequest).encode('utf-8')
          File "d:\python27\lib\site-packages\scrapyd\utils.py", line 20, in ren
der
            r = resource.Resource.render(self, txrequest)
          File "d:\python27\lib\site-packages\twisted-16.5.0rc1-py2.7-win32.egg\
twisted\web\resource.py", line 250, in render
            return m(request)
          File "d:\python27\lib\site-packages\scrapyd\webservice.py", line 86, i
n render_POST
            spiders = get_spider_list(project, version=version)
          File "d:\python27\lib\site-packages\scrapyd\utils.py", line 132, in ge
t_spider_list
            proc = Popen(pargs, stdout=PIPE, stderr=PIPE, env=env)
          File "d:\python27\lib\subprocess.py", line 711, in __init__
            errread, errwrite)
          File "d:\python27\lib\subprocess.py", line 959, in _execute_child
            startupinfo)
        exceptions.TypeError: environment can only contain strings

2017-06-23T16:50:13+0800 [twisted.python.log#info] "127.0.0.1" - - [23/Jun/2017:
08:50:13 +0000] "POST /addversion.json HTTP/1.1" 200 94 "-" "Python-urllib/2.7"