我遇到这两个问题/答案中所述的相同问题:
Python WSGI + Flask render_template - 500 Internal Server Error?
Getting a 500 Internal Server Error using render_template and Flask
并且我将其缩小到以下范围:
这里是文件结构:
../project/
project.py
templates/
about.html
我仍然收到此错误(缩短):
● project.service - Gunicorn instance to serve project
Loaded: loaded (/etc/systemd/system/project.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2020-02-15 06:28:46 UTC; 3min 28s ago
Main PID: 3942 (gunicorn)
Tasks: 4 (limit: 1151)
CGroup: /system.slice/project.service
├─3942 /home/dev/project/project_env/bin/python3.6 /home/dev/project/project_env/bin/gunicorn --workers 3 --bind unix:project.sock -m 007 wsgi
├─3967 /home/dev/project/project_env/bin/python3.6 /home/dev/project/project_env/bin/gunicorn --workers 3 --bind unix:project.sock -m 007 wsgi
├─3968 /home/dev/project/project_env/bin/python3.6 /home/dev/project/project_env/bin/gunicorn --workers 3 --bind unix:project.sock -m 007 wsgi
└─3969 /home/dev/project/project_env/bin/python3.6 /home/dev/project/project_env/bin/gunicorn --workers 3 --bind unix:project.sock -m 007 wsgi
Feb 15 06:29:17 project gunicorn[3942]: return self._load_template(name, self.make_globals(globals))
Feb 15 06:29:17 project gunicorn[3942]: File "/home/dev/project/project_env/lib/python3.6/site-packages/jinja2/environment.py", line 857, in _load_template
Feb 15 06:29:17 project gunicorn[3942]: template = self.loader.load(self, name, globals)
Feb 15 06:29:17 project gunicorn[3942]: File "/home/dev/project/project_env/lib/python3.6/site-packages/jinja2/loaders.py", line 117, in load
Feb 15 06:29:17 project gunicorn[3942]: source, filename, uptodate = self.get_source(environment, name)
Feb 15 06:29:17 project gunicorn[3942]: File "/home/dev/project/project_env/lib/python3.6/site-packages/flask/templating.py", line 60, in get_source
Feb 15 06:29:17 project gunicorn[3942]: return self._get_source_fast(environment, template)
Feb 15 06:29:17 project gunicorn[3942]: File "/home/dev/project/project_env/lib/python3.6/site-packages/flask/templating.py", line 89, in _get_source_fast
Feb 15 06:29:17 project gunicorn[3942]: raise TemplateNotFound(template)
Feb 15 06:29:17 project gunicorn[3942]: jinja2.exceptions.TemplateNotFound: about.html
据我所知,问题是最后一行
Feb 15 06:29:17 project gunicorn[3942]: jinja2.exceptions.TemplateNotFound: about.html
即使文件/文件夹在那里,我也不明白为什么。我能找到的最接近的是此评论:
https://stackoverflow.com/a/56589998/12070612
ENV = jinja2.Environment(loader=jinja2.FileSystemLoader(str(root_path / 'templates')))
template = ENV.get_template(your_template_name)
但是如果我在project.py文件中添加“ ENV = ...”行,则Gunicorn会抱怨并无法启动过程。
Flask中有多种呈现HTML的方法。您可以直接从Python代码直接生成HTML,类似于您对home
路由所做的操作,也可以使用诸如Jinja的模板语言。
您在about
路径中编写的是render_template
功能。 render_template
的工作方式是读取具有您作为参数传递的名称的HTML文件并呈现该模板。在这种情况下,您已调用[C0]方法并要求它呈现一个名为render_template
的模板,但是由于该模板不存在,因此无法加载并引发异常。
在与您的app.py文件相同的级别上创建about.html
文件,然后在其中键入内容并尝试呈现。应该可以。
要了解有关about.html
的更多信息,请查看文档render_template
或阅读Flask here的入门教程