Python/Flask错误:"ImportError:无法导入名称_compare_digest"

Question

在Windows中,当我遇到以下错误时,我正在关注此Flask教程:

C:\Users\Gregory Gundersen\Documents\Research\flask-test>python run.py
Traceback (most recent call last):
  File "run.py", line 2, in <module>
    from app import app
  File "C:\Users\Gregory Gundersen\Documents\Research\flask-test\app\__init__.py
", line 1, in <module>
    from flask import Flask
  File "C:\Python27\lib\site-packages\flask\__init__.py", line 21, in <module>
    from .app import Flask, Request, Response
  File "C:\Python27\lib\site-packages\flask\app.py", line 26, in <module>
    from . import json
  File "C:\Python27\lib\site-packages\flask\json.py", line 25, in <module>
    from itsdangerous import json as _json
  File "C:\Python27\lib\site-packages\itsdangerous.py", line 14, in <module>
    import hmac
  File "C:\Python27\lib\hmac.py", line 8, in <module>
    from operator import _compare_digest as compare_digest
ImportError: cannot import name _compare_digest

有SO问题和答案,但它们适用于OS X/Django.之前有没有人为PC/Flask看过或解决过这个问题？

Answer 1

您似乎对问题21306进行了一半更改(将hmac.compare_digest向后移植到2.7).

你的hmac模块有以下几行:

from operator import _compare_digest as compare_digest

在顶部,但你的sys.version_info节目你运行Python 2.7.6; 引用我们的快速聊天会话:

我:下一个简单的检查:

import sys
print(sys.version_info)

您: sys.version_info(major=2, minor=7, micro=6, releaselevel='final', serial=0)

但是,hmac您拥有的版本适用于Python 2.7.7及更高版本!

你想要重新安装你的Python; 下载2.7.8并重新安装它以确保您的标准库文件具有正确的二进制可执行文件.