我尝试在Raspberry Pi 3B +上建立基于Flask的网站，并使用Apache2（2.4.25）和mod_wsgi，但是我无法在Python3.5中导入flask_cors模块...
我使用命令ssudo apt-get install libapache2-mod-wsgi
因为我只打算使用Raspberry来托管我的网站，所以我尝试使用以下命令安装Python的3.5版系统范围内Flask所需的软件包：pip3 install -r requirements.txt where requirements.txt如下：
click==6.7
Flask==0.12.3
Flask-Cors==3.0.3
itsdangerous==0.24
Jinja2==2.9.6
MarkupSafe==1.0
six==1.11.0
Werkzeug==0.12.2
Requests==2.20.0
我认为我理解在Raspi上，最好使用命令pip3 install -U <module>导入模块，因为这些软件包未安装在python的默认位置，在我的情况下，以下命令对此进行了确认python -m site会产生以下信息：
sys.path = [
'/home/pi/.local/lib/python3.5/site-packages',
'/usr/lib/python35.zip',
'/usr/lib/python3.5',
'/usr/lib/python3.5/plat-arm-linux-gnueabihf',
'/usr/lib/python3.5/lib-dynload',
'/usr/local/lib/python3.5/dist-packages',
'/usr/local/lib/python3.5/dist-packages/virtualenv-16.1.0-py3.5.egg',
'/usr/lib/python3/dist-packages',
]
USER_BASE: '/home/pi/.local' (exists)
USER_SITE: '/home/pi/.local/lib/python3.5/site-packages' (exists)
ENABLE_USER_SITE: True
我的Flask和依赖项确实安装在/home/pi/.local/lib/python3.5/site-packages文件夹中。但这似乎不是问题，因为在python shell上检查导入时，在系统范围内一切正常：
pi@raspberrypi:~ $ python3
Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from flask_cors import CORS
>>>
知道了这一点，我试图放入以下文件来设置我的apache服务器：
/ p / apache2 / sites-enabled文件夹中的flaskregul.conf：
<VirtualHost *:80>
WSGIScriptAlias / /var/www/flaskregul/flaskregul.wsgi
Alias /static/ /var/www/flaskregul/dist/static/
<Directory /var/www/flaskregul/dist/static>
WSGIProcessGroup flaskregul
WSGIApplicationGroup %{GLOBAL}
Order allow,deny
Allow from all
</Directory>
ErrorLog /var/log/apache2/flask.monnomdedomaine.com.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
flaskregul.wsgi：
import sys
sys.path.insert(0,"/var/www/flaskregul") # path to my __init__.py file
sys.path.insert(0,"/home/pi/.local/lib/python3.5/site-packages") # path to the site-packages folder where the modules are installed by pip3
from __init__ import app as application
__ init __。py：
from flask import Flask
from flask_cors import CORS
我无法专门导入flask_cors模块，因为启动文件__init__.py会在文件/var/log/apache2/flask.monnomdedomaine.com.log中产生以下错误：
[Sat Nov 10 00:37:22.220394 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] mod_wsgi (pid=6804): Target WSGI script '/var/www/flaskregul/flaskregul.wsgi' cannot be loaded as Python module.
[Sat Nov 10 00:37:22.220972 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] mod_wsgi (pid=6804): Exception occurred processing WSGI script '/var/www/flaskregul/flaskregul.wsgi'.
[Sat Nov 10 00:37:22.221936 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] Traceback (most recent call last):
[Sat Nov 10 00:37:22.222365 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] File "/var/www/flaskregul/flaskregul.wsgi", line 1, in <module>
[Sat Nov 10 00:37:22.222395 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] from __init__ import app as application
[Sat Nov 10 00:37:22.222445 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] File "/var/www/flaskregul/__init__.py", line 2, in <module>
[Sat Nov 10 00:37:22.222463 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] from flask_cors import CORS
[Sat Nov 10 00:37:22.222557 2018] [wsgi:error] [pid 6804:tid 1955591216] [client 192.168.1.67:33550] ImportError: No module named 'flask_cors'
虽然Flask的导入看起来不错...
我已经尝试通过更改WSGI脚本文件来调试它：
import sys
sys.path.insert(0,"/var/www/flaskregul")
sys.path.insert(0,"/home/pi/.local/lib/python3.5/site-packages")
def application(environ, start_response):
status = '200 OK'
output = u''
output += u'sys.version = %s\n' % repr(sys.version)
output += u'sys.prefix = %s\n' % repr(sys.prefix)
output += u'sys.path = %s\n' % repr(sys.path)
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)
return [output.encode('UTF-8')]
这是一条建议，该网页上的建议来自mod_wsgi：https://modwsgi.readthedocs.io/en/develop/user-guides/checking-your-installation.html。打开网页时，我得到以下结果：
sys.version = '3.5.3 (default, Sep 27 2018, 17:25:39) \n[GCC 6.3.0 20170516]'
sys.prefix = '/usr'
sys.path = ['/home/pi/.local/lib/python3.5/site-packages', '/var/www/flaskregul', '/usr/lib/python35.zip', '/usr/lib/python3.5', '/usr/lib/python3.5/plat-arm-linux-gnueabihf', '/usr/lib/python3.5/lib-dynload', '/usr/local/lib/python3.5/dist-packages', '/usr/local/lib/python3.5/dist-packages/virtualenv-16.1.0-py3.5.egg', '/usr/lib/python3/dist-packages']
我觉得路径是正确的！实际上，我成功导入了位于/ var / www / flaskregul位置的自己的模块...
我迷路了，我不明白为什么为什么不特别使用flask_cors模块，因为它确实在路径中：
pi@raspberrypi:~/.local/lib/python3.5/site-packages $ l | grep flask
drwxr-xr-x 5 pi pi 4096 nov. 9 23:30 flask
drwxr-xr-x 3 pi pi 4096 nov. 10 00:08 flask_cors
pi@raspberrypi:~/.local/lib/python3.5/site-packages $ l flask_cors
total 44
-rw-r--r-- 1 pi pi 13771 nov. 10 00:08 core.py
-rw-r--r-- 1 pi pi 4937 nov. 10 00:08 decorator.py
-rw-r--r-- 1 pi pi 7405 nov. 10 00:08 extension.py
-rw-r--r-- 1 pi pi 924 nov. 10 00:08 __init__.py
drwxr-xr-x 2 pi pi 4096 nov. 10 00:08 __pycache__
-rw-r--r-- 1 pi pi 22 nov. 10 00:08 version.py
任何帮助将不胜感激！我目前正在以令人担忧的速度脱发！
答案 0 :(得分：0)
我的天哪，我在放弃之前拼命地解决了这个问题。
我在shell上执行了以下命令：（pip是python3.5 /！\的pip）
pip uninstall flask
pip uninstall flask_cors
sudo pip install --upgrade pip
hash -d pip
sudo pip install -U flask
sudo pip install -U flask_cors
网站开始运行！ ：D