No module named ‘haystack.urls‘等各种django报错解决方案

报错：ModuleNotFoundError: No module named ‘haystack.urls’
解决：

pip uninstall haystack

pip install django-haystack
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报错：cannot import name ‘smart_text’ from ‘django.utils.encoding’
解决：setting.py中添加

import django
from django.utils.encoding import smart_str
django.utils.encoding.smart_text = smart_str
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报错：ModuleNotFoundError: No module named ‘haystack.backends.whoosh_cn_backend’

解决：setting.py中修改

'ENGINE': 'haystack.backends.whoosh_cn_backend.WhooshEngine',
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为：

        'ENGINE': 'haystack.backends.whoosh_backend.WhooshEngine',
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报错： cannot import name ‘url’ from ‘django.conf.urls’
解决：

pip install Whoosh
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修改：

from django.conf.urls import url
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为：

from django.urls import re_path as url
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报错：django.db.utils.OperationalError: (1045, “Access denied for user ‘root’@‘localhost’ (using password: YES)”)

这是mysql密码错了，到对应位置修改为正确密码：

报错：installing mysqlclient error: mysqlclient 1.4.0 or newer is required； you have 0.9.3
解决：

pip3 uninstall mysqlclient
pip3 uninstall pymysql
pip3 install mysqlclient
pip3 install pymysql
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