原本seafile7.0.5服务端安装在debian9.6系统python2.7环境，后改为python为3.5.3升级7.1.5（7.1.5版本要求python3环境）
./seafile.sh ./seahub.都能正常启动，但是网页和客户端软件都无法使用。
错误日志：
Traceback (most recent call last):
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/core/handlers/exception.py”, line 41, in inner
response = get_response(request)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/core/handlers/base.py”, line 244, in _legacy_get_response
response = middleware_method(request)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/middleware/locale.py”, line 24, in process_request
i18n_patterns_used, prefixed_default_language = is_language_prefix_patterns_used(urlconf)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/conf/urls/i18n.py”, line 29, in is_language_prefix_patterns_used
for url_pattern in get_resolver(urlconf).url_patterns:
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/utils/functional.py”, line 35, in get
res = instance.dict[self.name] = self.func(instance)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/urls/resolvers.py”, line 407, in url_patterns
patterns = getattr(self.urlconf_module, “urlpatterns”, self.urlconf_module)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/utils/functional.py”, line 35, in get
res = instance.dict[self.name] = self.func(instance)
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/urls/resolvers.py”, line 400, in urlconf_module
return import_module(self.urlconf_name)
File “/usr/lib/python3.5/importlib/init.py”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 986, in _gcd_import
File “”, line 969, in _find_and_load
File “”, line 958, in _find_and_load_unlocked
File “”, line 673, in _load_unlocked
File “”, line 673, in exec_module
File “”, line 222, in _call_with_frames_removed
File “/home/seafile-server-7.1.5/seahub/seahub/utils/rooturl.py”, line 41, in
url(r’^%s’ % settings.SITE_ROOT[1:], include(settings.SITE_ROOT_URLCONF)),
File “/home/seafile-server-7.1.5/seahub/thirdpart/django/conf/urls/init.py”, line 50, in include
urlconf_module = import_module(urlconf_module)
File “/usr/lib/python3.5/importlib/init.py”, line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File “”, line 986, in _gcd_import
File “”, line 969, in _find_and_load
File “”, line 958, in _find_and_load_unlocked
File “”, line 673, in _load_unlocked
File “”, line 673, in exec_module
File “”, line 222, in _call_with_frames_removed
File “/home/seafile-server-7.1.5/seahub/seahub/urls.py”, line 8, in
from seahub.views.sysadmin import *
File “/home/seafile-server-7.1.5/seahub/seahub/views/sysadmin.py”, line 13, in
from openpyxl import load_workbook
File “/home/seafile-server-7.1.5/seahub/thirdpart/openpyxl/init.py”, line 6, in
from openpyxl.workbook import Workbook
File “/home/seafile-server-7.1.5/seahub/thirdpart/openpyxl/workbook/init.py”, line 4, in
from .workbook import Workbook
File “/home/seafile-server-7.1.5/seahub/thirdpart/openpyxl/workbook/workbook.py”, line 7, in
from openpyxl.worksheet.worksheet import Worksheet
File “/home/seafile-server-7.1.5/seahub/thirdpart/openpyxl/worksheet/worksheet.py”, line 396
return f"{get_column_letter(min_col)}{min_row}:{get_column_letter(max_col)}{max_row}
SyntaxError: invalid syntax升级失败后，重新安装了最新的8.0.2社区版服务端，数据和账号信息还在，只是需要重新登录账号并重新同步资料库。
说一下步骤（系统是debian9.6，默认python2.7.13）（当时升级失败应该是python3的环境没有弄好）：
大体思路：备份数据库文件，重新安装最新的8.0.2社区版服务端，恢复数据库。
1.老版本为7.0.5，数据库通过7.1.5及8.0.2安装包依次升级（版本更新后数据库应该有变动过），备份3个数据库
2.使用pyenv管理python环境（安装各版本python及环境切换都很方便），安装及使用参考：https://51.ruyo.net/3708.html
3.使用pyenv安装最新的python3.9.1并切换为默认环境，使用python -V和pip -V确认为3.9.1版本，
4.按照官方教程安装8.0.2（安装依赖的时候会报错，根据错误提醒安装对应的python模块即可）
5.安装步骤到导入seahub数据库的时候会报mysql语法错误，不用管，因为安装程序没有正常结束，需要手动建立seafile-server-latest到seafile-server-8.0.2的软连接，最后删除/tmp/seahub_cache里面缓存文件，
rm /home/seafile-server-latest ln -s /home/seafile-server-8.0.2 seafile-server-latest rm -rf /tmp/seahub_cache/*
6.分别导入3个数据库对应的备份，并将seafile以前的个性化配置文件信息，加进新的配置文件，
7.安装python的mysqlclient模块，否则启动seafile会报错，
pip install mysqlclient
8.如果一切顺利，就可以正常启动seafile和seahub服务，在客户端重新登录同步一下就可以了。
前面升级失败应该是python3环境没有配置好，要是弄好得话，升级应该就没有这么麻烦了，搞了好几天，愁哟。
现在就是担心安装8.0.2过程中那个数据库语法错误对后面使用会有什么影响。。。
本文链接：http://www.bosim.vip/index.php/post/33.html
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发表于 2021-01-14 。