1. Django和python版本信息

Django版本：Django 1.11(可通過pip list命令查看)
python版本：Python 3.7.6(可通過python --version命令查看)
客戶機(jī)操作系統(tǒng)版本：Windows 10 家庭中文版

2. 問題描述

2.1 在Windows上安裝Django

    C:\WINDOWS\system32>pip install -i https://pypi.douban.com/simple django==1.11

2.2 新建Django項目

    D:\>django-admin startproject mysite

2.3 啟動Django，報錯如下

    啟動命令：D:\mysite>python manage.py runserver

Unhandled exception in thread started by <function check_errors.<locals>.wrapper at 0x000001CDFA9D6DC8>
Traceback (most recent call last):
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\utils\autoreload.py", line 227, in wrapper
    fn(*args, **kwargs)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\core\management\commands\runserver.py", line 117, in inner_run
    autoreload.raise_last_exception()
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\utils\autoreload.py", line 250, in raise_last_exception
    six.reraise(*_exception)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\utils\six.py", line 685, in reraise
    raise value.with_traceback(tb)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\utils\autoreload.py", line 227, in wrapper
    fn(*args, **kwargs)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\__init__.py", line 27, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\apps\registry.py", line 85, in populate
    app_config = AppConfig.create(entry)
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\apps\config.py", line 94, in create
    module = import_module(entry)
  File "D:\Application\LINUX\python\python-3.7.6\lib\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 "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\contrib\admin\__init__.py", line 4, in <module>
    from django.contrib.admin.filters import (
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\contrib\admin\filters.py", line 10, in <module>
    from django.contrib.admin.options import IncorrectLookupParameters
  File "D:\Application\LINUX\python\python-3.7.6\lib\site-packages\django\contrib\admin\options.py", line 12, in <module>
    from django.contrib.admin import helpers, widgets
  File "D:\Application\LINUX\python\python-3.7.6\lib\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

2.4 問題產(chǎn)生原因和解決方案

問題原因
django 1.11版本和python3.7版本不兼容, 2.0版本以后的Django修復(fù)了這個問題
解決方案1
修改\You_local_Path\python-3.7.6\Lib\site-packages\django\contrib\admin\widgets.py，去掉圖片中的逗號即可(這里采用該種解決方案)

解決方案2
升級Django版本：pip install -U Django

2.5 采用方案1后，重啟Django成功

D:\mysite>python manage.py runserver 127.0.0.1:8080

Performing system checks...

System check identified no issues (0 silenced).

You have 13 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
May 02, 2020 - 21:05:56
Django version 1.11, using settings 'mysite.settings'
Starting development server at http://127.0.0.1:8080/
Quit the server with CTRL-BREAK.
[02/May/2020 21:06:11] "GET / HTTP/1.1" 200 1716
Not Found: /favicon.ico
[02/May/2020 21:06:12] "GET /favicon.ico HTTP/1.1" 404 1962

通過瀏覽器訪問，頁面顯示正常，問題消除

雖然頁面能正常顯示了，但是輸出信息中存在報錯，因此到項目目錄下執(zhí)行命令：python manage.py migrate

D:\mysite>python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying admin.0003_logentry_add_action_flag_choices... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying auth.0010_alter_group_name_max_length... OK
  Applying auth.0011_update_proxy_permissions... OK
  Applying sessions.0001_initial... OK

完成后，重啟Django項目，報錯消失，如下：

Performing system checks...

System check identified no issues (0 silenced).
May 04, 2020 - 13:16:14
Django version 1.11, using settings 'MyDjango.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

3 第一個展示指定頁面的Django項目

修改urls.py文件中的內(nèi)容(直接使用下面的內(nèi)容替換掉該頁面中的代碼即可)，如下，這種是Django定義好的模板，按照要求寫就行

from django.conf.urls import url
from django.contrib import admin
from django.shortcuts import HttpResponse, render

def login(request):
    """
    處理用戶請求，并返回內(nèi)容
    :param request: 用戶請求的所有信息(對象)
    :return:
    """
    # return HttpResponse('welcome')      # 直接將括號中的字符串返回給瀏覽器
    return render(request, 'login.html')  # 將login.html文件返回給瀏覽器

urlpatterns = [
    # url(r'^admin/', admin.site.urls),
    url(r'^login', login),
]

頁面將要展示的html文件內(nèi)容如下：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body>
    <h1>請輸入用戶名和密碼</h1>
    <form action="">
        <input type="text" name="username">
        <input type="password" name="password">
        <div>
            <input type="submit" value="login">
        </div>
    </form>

</body>
</html>

啟動Django項目，并在瀏覽器中訪問，結(jié)果如下：

此時pycharm中Django輸出信息如下所示：