Question

我收到一条错误消息。这表明我误导了exec，因为在＆＃39; get＆＃39;中有一些嵌套函数。那我怎么能避免这个问题呢？我的例程在交互式控制台中工作正常，所以我不知道我的代码中的子函数是什么：https://stackoverflow.com/questions/4484872/why-doesnt-exec-work-in-a-function-with-a-subfunction

ERROR    2018-02-16 20:57:49,507 wsgi.py:263] 
Traceback (most recent call last):
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 240, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 299, in _LoadHandler
    handler, path, err = LoadObject(self._handler)
  File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/google/appengine/runtime/wsgi.py", line 85, in LoadObject
    obj = __import__(path[0])
  File "/Users/brian/googleapps/c4ica9o/main.py", line 2, in <module>
    from views import MainPageParty, CreateParty, DeleteParty, EditParty, Host, Play, Start, \
SyntaxError: unqualified exec is not allowed in function 'get' it contains a nested function with free variables (views.py, line 132)
INFO     2018-02-16 20:57:49,514 module.py:812] default: "GET /host/BBB HTTP/1.1" 500 -

Python代码：

class Host(BaseHandler):

    def get(self, ID):
    key = ndb.Key(Pages,ID,Parties,ID)
    party = key.get()
    tables=party.tables
    rounds=party.rounds
    round_key = 'round'+str(rounds-1)
    table_parent_key = ndb.Key(Pages,ID,Parties,ID,Rounds,round_key).get()
    keys0 = ['p1','p2','p3','p4','s1','s2']
    keys = ['p1','p2','p3','p4','s1','s2','swap']
    dict = {}
    for r in range(rounds):
        round_key = 'round'+str(r)
        names = []
        values = []
        for t in range(tables):
        T=str(t)
        T_key_name = 'table'+T
        table_parent_key = ndb.Key(Pages,ID,Parties,ID,Rounds,round_key,Tables,T_key_name)
        temp = table_parent_key.get()
        if r == 0:
            for k in keys0:
                exec("name='r0t%d%s'"  % (t,k))
                names.append(name)
            for k in keys0:
                exec("value=temp.%s"  % (k))
                values.append(value)
            dict.update({names[i]:values[i] for i in range(len(keys0))})
        else:
            for k in keys:
                exec("name='r%dt%d%s'"  % (r,t,k))
                names.append(name)
            for k in keys:
                exec("value=temp.%s"  % (k))
                values.append(value)
            dict.update({names[i]:values[i] for i in range(len(keys))})
    template_values = {'ID':ID, 'dict': dict}
    template = JINJA_ENVIRONMENT.get_template('host.html')
    self.response.out.write(template.render( template_values))
import webapp2
from views import MainPageParty, CreateParty, DeleteParty, EditParty, Host, Play, Start, \
                    MainPage, CreatePage, DeletePage, EditPage, Unexpected, File, Wifi

app = webapp2.WSGIApplication([
        ('/', MainPage), 
        ('/host/([\w]+)', Host), 
        ],
        debug=True)

Answer 1

嵌套函数是为在

中实现字典理解而创建的隐式函数

dict.update({names[i]:values[i] for i in range(len(keys))})

停止使用exec。你用它做的事情毫无意义，与Python 3不兼容; jbch发布了你应该做的事情。

此外，停止混合标签和空格。这也是Python 3不兼容的，当显示标签宽度不是8个空格时，它看起来很混乱。

不合格的执行官不得参与职能“获得”。

1 个答案: