Python3.7&Django1.11.X 兼容性问题
最近在自学Django，根据GitHub上良心翻译项目：Django入门与实践教程。在环境搭建过程中遇到一个错误。
环境：
- MacOS
- Python 3.7
- Django 1.11.4
启动Django命令python manage.py runserver遇到如下错误：
/usr/local/bin/python3.7 /Users/yuzhou_1su/DjangoProject/mysite/manage.py runserver 8000
Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x109ce06a8>
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/autoreload.py", line 228, in wrapper
fn(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/core/management/commands/runserver.py", line 117, in inner_run
autoreload.raise_last_exception()
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/autoreload.py", line 251, in raise_last_exception
six.reraise(*_exception)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/utils/autoreload.py", line 228, in wrapper
fn(*args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/__init__.py", line 27, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/apps/registry.py", line 85, in populate
app_config = AppConfig.create(entry)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/apps/config.py", line 94, in create
module = import_module(entry)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
File "<frozen importlib._bootstrap>", line 983, in _find_and_load
File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 728, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/contrib/admin/__init__.py", line 4, in <module>
from django.contrib.admin.filters import (
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/contrib/admin/filters.py", line 10, in <module>
from django.contrib.admin.options import IncorrectLookupParameters
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/contrib/admin/options.py", line 12, in <module>
from django.contrib.admin import helpers, widgets
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/contrib/admin/widgets.py", line 151
'%s=%s' % (k, v) for k, v in params.items(),
^
SyntaxError: Generator expression must be parenthesized
解决方法：
看到报错的最后一句：File “/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/django/contrib/admin/widgets.py”, line 151
然后我们定位到这个文件的151行，把“ ‘%s=%s’ % (k, v) for k, v in params.items(), ”中的后边的逗号去掉，保存重新启动就完成了。
