python3的Django memcached庫

Question

我想爲我的Django 1.8.5（在python3）網站上使用memcached。

目前我已經嘗試過pylibmc和python-memcached。

pylibmc給了我這個錯誤

libmemcached/get.cc:87 Assertion "ptr->query_id == query_id +1" failed for function "memcached_get_by_key" likely for "Programmer error, the query_id was not incremented." 
Number of stack frames obtained: 24 
    /usr/lib/x86_64-linux-gnu/libmemcached.so.10 : memcached_get_by_key()+0x283 
    /usr/lib/x86_64-linux-gnu/libmemcached.so.10 : memcached_get()+0x1f 
    /home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/_pylibmc.cpython-34m.so :()+0x61fd 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x3f6a 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalCodeEx()+0x15b 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x4490 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalCodeEx()+0x15b 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x4490 
/home/francesco/virtualenvs/TeamCompSite/bin/python() [0x56a7ec] 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyObject_Call()+0x3a 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x1e2f 
/home/francesco/virtualenvs/TeamCompSite/bin/python() [0x56a7ec] 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyObject_Call()+0x3a 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x1e2f 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x403d 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_EvalFrameEx()+0x403d 
/home/francesco/virtualenvs/TeamCompSite/bin/python() [0x56a7ec] 
/home/francesco/virtualenvs/TeamCompSite/bin/python() [0x4e21bd] 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyObject_Call()+0x3a 
    /home/francesco/virtualenvs/TeamCompSite/bin/python : PyEval_CallObjectWithKeywords()+0x36 
/home/francesco/virtualenvs/TeamCompSite/bin/python() [0x5be452] 
    /lib/x86_64-linux-gnu/libpthread.so.0 :()+0x8182 
    /lib/x86_64-linux-gnu/libc.so.6 : clone()+0x6d 

看起來像一個非常罕見的事情，如找對谷歌我只找到pylibmc: 'Assertion "ptr->query_id == query_id +1" failed for function "memcached_get_by_key"'

不幸的是我不能改變Django是如何處理的memcached lib中。

然後我試了python-memcached

這次我得到了

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x7f00537e9f28> 
Traceback (most recent call last): 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 229, in wrapper 
    fn(*args, **kwargs) 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/core/management/commands/runserver.py", line 107, in inner_run 
    autoreload.raise_last_exception() 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 252, in raise_last_exception 
    six.reraise(*_exception) 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/six.py", line 658, in reraise 
    raise value.with_traceback(tb) 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/utils/autoreload.py", line 229, in wrapper 
    fn(*args, **kwargs) 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/__init__.py", line 18, in setup 
    apps.populate(settings.INSTALLED_APPS) 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/django/apps/registry.py", line 115, in populate 
    app_config.ready() 
    File "/media/francesco/A6528DA1528D76B9/Programmazione/Python/Spark/team_comp_site/teamcomp/apps.py", line 19, in ready 
    client.get_stats() 
    File "/home/francesco/virtualenvs/TeamCompSite/lib/python3.4/site-packages/memcache.py", line 338, in get_stats 
    stats = line.split(' ', 2) 
TypeError: 'str' does not support the buffer interface 

看起來像蟒蛇，memcached的只支持python2（我的壞手之前不檢查）

讓我們嘗試python3-memcached的

該網站負荷！

只是爲了告訴我熟悉的錯誤頁面

Exception Value: local variable 'val' referenced before assignment 

Exception Location:  /home/xxxxx/virtualenvs/xxxx/lib/python3.4/site-packages/memcache.py in _recv_value, line 1026 
Python Executable: /home/xxxxx/virtualenvs/xxxxx/bin/python 
Python Version:  3.4.3 

那麼，什麼是python3（。4）memcached的客戶選擇呢？

Answer 1

使用python3-memcached只是觸發一個更乾淨的字符串和字節緩衝區管理。

在python2的unicode字符串中，字節數組和字符串是ascii或鏈的\uXXXX個字符。 ascii字符串到bytestring之間的轉換是安靜的，但是從bytestring到stringexplicite。

在python3：unicode類型不再存在。你只需要str，並且只有bytearray。由於這一切都必須是明確的，所以一切都是可以預測的。 python-memcached庫被重新開發以適應這種新的和更簡單的方式來處理py3中的字符串。