使用 python3.6 错误的 Django 迁移：root：找不到哈希 sha3_224 的代码答案

【问题标题】：Django migration with python3.6 ERROR:root:code for hash sha3_224 was not found使用 python3.6 错误的 Django 迁移：root：找不到哈希 sha3_224 的代码
【发布时间】：2017-10-08 12:23:56
【问题描述】：

您好，我阅读了Django tutorials，并且在迁移过程中遇到了与特定sha3_224 哈希函数相关的错误。如何解决这个问题呢？谢谢。

(venv) linuxoid@linuxoid-ThinkPad-L540:~/myprojects/myproject$ python manage.py makemigrations
ERROR:root:code for hash sha3_224 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_sha3_224'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha3_224
ERROR:root:code for hash sha3_256 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_sha3_256'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha3_256
ERROR:root:code for hash sha3_384 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_sha3_384'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha3_384
ERROR:root:code for hash sha3_512 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_sha3_512'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type sha3_512
ERROR:root:code for hash shake_128 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_shake_128'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type shake_128
ERROR:root:code for hash shake_256 was not found.
Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 121, in __get_openssl_constructor
    f = getattr(_hashlib, 'openssl_' + name)
AttributeError: module '_hashlib' has no attribute 'openssl_shake_256'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 243, in <module>
    globals()[__func_name] = __get_hash(__func_name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 128, in __get_openssl_constructor
    return __get_builtin_constructor(name)
  File "/home/linuxoid/myprojects/venv/lib/python3.6/hashlib.py", line 113, in __get_builtin_constructor
    raise ValueError('unsupported hash type ' + name)
ValueError: unsupported hash type shake_256
No changes detected

【问题讨论】：

我在尝试使用 django 通道时大致得到了这个堆栈跟踪，降级或重新创建虚拟环境清除了这一点。有人可以谈谈 hashlib 实际上在哪里获得这种编码，以及 django 在哪里尝试使用它们？为什么降级或构建新的 venv 会有所帮助？

标签： django migration models python-3.6

【解决方案1】：

检查您的 python 最近是否已更新。 venv 可能指向旧的，重新创建 venv 为我们修复了它。

运行 mkvirtualenv venv 或 virtualenv venv（取决于您最初创建它的方式）也应该可以在保留已安装的软件包的同时工作。

【讨论】：

【解决方案2】：

！请注意，这真的是热修复！

此问题出现在新版本的python - 3.6.3。

降级到 3.6.2 帮助了我

这是旧版 PPA：https://launchpad.net/~fkrull/+archive/ubuntu/deadsnakes/+index?batch=75&direction=backwards&start=75

降级 python的进一步操作的命令：

sudo apt install libpython3.6-minimal=3.6.2-1+xenial1 sudo apt install python3.6-minimal=3.6.2-1+xenial1 sudo apt install python3.6-stdlib=3.6.2-1+xenial1 sudo apt install python3.6=3.6.2-1+xenial1

【讨论】：

另外，同事说virtualenv reinitilizing解决了这个问题，因为那里使用了旧的常用python库
升级到 3.6.3 后发生在我身上用 3.6.3 重新创建 virtualenv 解决了这个问题
@tista3 太棒了。谢谢。同样的事情也发生在我身上。我运行了一些更新（没有意识到 python 从 3.6.2 到 3.6.3）。你应该写一个答案，因为这对我来说是更明确的解决方案。

【解决方案3】：

这解决了我的问题：

cd /usr/bin
sudo cp python3.6 python3

之前我有3.6.2，在做apt-upgrade之后系统坏了。

【讨论】：

【解决方案4】：

这发生在我升级到 3.6.3 后尝试使用 Python 3.6.3 或更高版本创建新的 virtualenv。这解决了我的问题。

【讨论】：