过pip安装Scrapy之后，并具有Python 2.7.10：

scrapy
Traceback (most recent call last):
File "/usr/local/bin/scrapy",line 7,in <module>
from scrapy.cmdline import execute
File "/Library/Python/2.7/site-packages/scrapy/__init__.py",line 48,in <module>
from scrapy.spiders import Spider
File "/Library/Python/2.7/site-packages/scrapy/spiders/__init__.py",line 10,in <module>
from scrapy.http import Request
File "/Library/Python/2.7/site-packages/scrapy/http/__init__.py",line   
12,in <module>
from scrapy.http.request.rpc import XmlRpcRequest
File "/Library/Python/2.7/site-packages/scrapy/http/request/rpc.py",in <module>
from six.moves import xmlrpc_client as xmlrpclib
ImportError: cannot import name xmlrpc_client

但是我可以导入模块：

Python 2.7.10 (default,Jun 10 2015,19:42:47) 
[GCC 4.2.1 Compatible Apple LLVM 6.1.0 (clang-602.0.53)] on darwin
Type "help","copyright","credits" or "license" for more information.
>>> import scrapy
>>> 

这是怎么回事？

我正在尝试使用ttk模块为tkinter中的GUI应用程序为Windows创建可执行文件。我使用cx_freeze制作了一个exe，但是当我在控制台中运行该应用程序时，出现以下错误：

    D:\My Dropbox\python\SAR Calculator\src\dist_tk>
Traceback (most recent call last):

  File "C:\Python31\lib\site-packages\cx_Freeze\
7,in <module>

    exec(code,m.__dict__)

  File "sarcalc_tk.py",line 14,in <module>

  File "C:\Python31\lib\tkinter\__init__.py",li

    from tkinter import _fix

ImportError: cannot import name _fix

这是我的代码中的第14和15行：

import tkinter as tk
import tkinter.ttk as ttk

python manage.py syncdb

Traceback (most recent call last):
File "manage.py",line 10,in <module> execute_from_command_line(sys.argv)
File "/home/vermahim17/env/local/lib/python2.7/site-packages/django/core/management/__init__.py",line 350,in execute_from_command_line utility.execute()
File "/home/vermahim17/env/local/lib/python2.7/site-packages/django/core/management/__init__.py",line 324,in execute django.setup()
File "/home/vermahim17/env/local/lib/python2.7/site-packages/django/__init__.py",line 18,in setup apps.populate(settings.INSTALLED_APPS)
File "/home/vermahim17/env/local/lib/python2.7/site-packages/django/apps/registry.py",line 85,in populate app_config = AppConfig.create(entry)
File "/home/vermahim17/env/local/lib/python2.7/site-packages/django/apps/config.py",line 90,in create module = import_module(entry)
File "/usr/lib/python2.7/importlib/__init__.py",line 37,in import_module __import__(name)
File "/home/vermahim17/env/local/lib/python2.7/site-packages/keyedcache/__init__.py",line 27,in <module>
from django.core.cache import get_cache,InvalidCacheBackendError,DEFAULT_CACHE_ALIAS ImportError: cannot import name get_cache

解决方法

我构建了一个简单的Web应用程序，其中包含Flask和Python，我打算将其上传到Heroku。

在本地启动我的应用程序时，请使用以下脚本：

#!venv/bin/python
from app import app
app.run(debug = True)

我收到此错误消息：

Traceback (most recent call last):
File "./run.py",line 2,in <module>
    from app import app,mail
File "/home/ricardo/personalSite/app/__init__.py",line 3,in <module>
    from app import index
File "/home/ricardo/personalSite/app/index.py",line 6,in <module>
    from emails import send_email
File "/home/ricardo/personalSite/app/emails.py",mail
ImportError: cannot import name mail

因此，它无法导入mail。

在app目录中我有this __init__.py，这是我创建的Mail对象，导致导入困难：

from flask import Flask
app = Flask(__name__)
from app import index
from flask.ext.mail import Mail
mail = Mail(app)

这是emails.py我调用该send_mail函数的文件：

from flask.ext.mail import Message
from app import app,mail
from flask import render_template
from config import ADMINS
from decorators import async

因此，根据错误消息，错误位于此文件的中from app import app,mail。

问题是什么？为什么不能导入mail？

更新：

这是我的目录清单：

persSite\
  venv\
    <virtual environment files>
  app\
    static\
    templates\
    __init__.py
    index.py
    emails.py
    decorators.oy
  tmp\
  run.py