使用 Flask 和 render_template 显示 HTML 表格 [英] Show HTML table with Flask and render_template
问题描述
我想在使用 Google Cloud SQL 和 Google App Engine 的网站上显示一个表格.我正在使用 Flask 和 pymysql.为了显示我的查询结果，我使用了 Flask 的 render_template.
I would like to show a table on a website using Google Cloud SQL and Google App Engine. I am using Flask and pymysql. To show the result of my query I use the render_template of Flask.
我已经在这里找到了其他类似的主题(例如 主题:将表格结果列出到HTML with Flask)，但在部署应用程序时仍然出现错误.似乎错误与 for 循环有关.. 错误说jinja2.exceptions.TemplateSyntaxError: tag name expected".
I already found other similar topics here (like Topic: Listing table results to HTML with Flask), but I still get an error when I deploy my app. It seems that the error has to do with the for loop.. The error says "jinja2.exceptions.TemplateSyntaxError: tag name expected".
这是我收到的完整错误消息:
Here's the full error message I get:
ERROR in app: Exception on /analysis [GET]
Traceback (most recent call last): File "/env/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app response = self.full_dispatch_request()
File "/env/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request rv = self.handle_user_exception(e)
File "/env/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception reraise(exc_type, exc_value, tb)
File "/env/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise raise value
File "/env/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request rv = self.dispatch_request()
File "/env/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args)
File "/srv/main.py", line 61, in analysis return render_template("analysis.html", result = result)
File "/env/lib/python3.7/site-packages/flask/templating.py", line 134, in render_template return _render(ctx.app.jinja_env.get_or_select_template(template_name_or_list), File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 869, in get_or_select_template return self.get_template(template_name_or_list, parent, globals)
File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 830, in get_template return self._load_template(name, self.make_globals(globals))
File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 804, in _load_template template = self.loader.load(self, name, globals)
File "/env/lib/python3.7/site-packages/jinja2/loaders.py", line 125, in load code = environment.compile(source, name, filename)
File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 591, in compile self.handle_exception(exc_info, source_hint=source_hint)
File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 780, in handle_exception reraise(exc_type, exc_value, tb)
File "/env/lib/python3.7/site-packages/jinja2/_compat.py", line 37, in reraise raise value.with_traceback(tb)
File "/srv/templates/analysis.html", line 23, in template <p class="p1"><span class="s1"><span class="Apple-tab-span"> </span>{% </span><span class="s2">for</span><span class="s1"> r </span><span class="s2">in</span><span class="s1"> result %}</span></p>
File "/env/lib/python3.7/site-packages/jinja2/environment.py", line 497, in _parse return Parser(self, source, name, encode_filename(filename)).parse()
File "/env/lib/python3.7/site-packages/jinja2/parser.py", line 901, in parse result = nodes.Template(self.subparse(), lineno=1)
File "/env/lib/python3.7/site-packages/jinja2/parser.py", line 883, in subparse rv = self.parse_statement()
File "/env/lib/python3.7/site-packages/jinja2/parser.py", line 125, in parse_statement self.fail('tag name expected', token.lineno)
File "/env/lib/python3.7/site-packages/jinja2/parser.py", line 59, in fail raise exc(msg, lineno, self.name, self.filename) jinja2.exceptions.TemplateSyntaxError: tag name expected
我在 main.py 中的代码:
My Code in main.py:
import logging
import os
from flask import Flask, render_template
from flask import request
import urllib.request
from urllib.parse import parse_qs, urlparse
import platform
import pymysql
import datetime
db_user = os.environ.get('CLOUD_SQL_USERNAME')
db_password = os.environ.get('CLOUD_SQL_PASSWORD')
db_name = os.environ.get('CLOUD_SQL_DATABASE_NAME')
db_connection_name = os.environ.get('CLOUD_SQL_CONNECTION_NAME')
app = Flask(__name__)
@app.route('/analysis', methods=['GET'])
def analysis():
if os.environ.get('GAE_ENV') == 'standard':
unix_socket = '/cloudsql/{}'.format(db_connection_name)
cnx = pymysql.connect(user=db_user, password=db_password,
unix_socket=unix_socket, db=db_name)
else:
host = '127.0.0.1'
#unix_socket = '/cloudsql/{}'.format(db_connection_name)
cnx = pymysql.connect(user=db_user, password=db_password,
unix_socket=unix_socket, db=db_name)
with cnx.cursor() as cursor:
sql = 'SELECT * FROM content'
cursor.execute(sql)
result = cursor.fetchall()
cnx.close()
return render_template("analysis.html", result = result)
if __name__ == '__main__':
app.run(host='127.0.0.1', port=8080, debug=True)
文件分析.html:
<!doctype html>
<table>
<tr>
<th>contentID</th>
<th>timestamp</th>
<th>clientID</th>
<th>content</th>
</tr>
{% for r in result %}
<tr>
<td>{{ r[0] }}</td>
<td>{{ r[1] }}</td>
<td>{{ r[2] }}</td>
<td>{{ r[3] }}</td>
</tr>
{% endfor %}
</table>
您有什么建议我可以更改以使其正常工作吗?
提前致谢！
Do you have any suggestions what I can can change to make it work?
Thanks in advance!
推荐答案
根据堆栈跟踪，您用于 analysis.html 的文本编辑器不是纯文本编辑器.它以其他格式保存文件，使其成为无效的 Jinja2 语法.
Based on the stack trace, the text editor you're using for analysis.html isn't a plain text editor. It's saving the file in some other format, making it invalid Jinja2 syntax.
所以你在编辑器中看到的这一行:
So this line that you see in your editor:
{% for r in result %}
Python 将显示为(基于堆栈跟踪；为清晰起见添加了一些换行符):
Python will see as (based on the stack trace; added some line breaks for clarity):
<p class="p1">
<span class="s1">
<span class="Apple-tab-span">
</span>
{% </span><span class="s2">for</span><span class="s1"> r </span><span class="s2">in</span><span class="s1"> result %}
</span>
</p>
要解决此问题，请在纯文本编辑器中打开文件 analysis.html 并根据需要对其进行编辑.
To fix the problem, open the file analysis.html in a plain text editor and edit it as needed.
这篇关于使用 Flask 和 render_template 显示 HTML 表格的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
