Python 如何在 jinja 2 中访问会话变量 - Flask
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How to access session variables in jinja 2 - Flask
提问by bpb101
Do I need to pass session variables manually from Flask to my HTML or are they automatically sent in some way?
我需要手动将会话变量从 Flask 传递到我的 HTML 还是它们以某种方式自动发送？
Can I do
我可不可以做
return render_template('index.html')
and access a session variable username, for example, like {{session['username'}}in the HTML file?
并访问会话变量username，例如{{session['username'}}在 HTML 文件中？
回答by bpb101
In python
在蟒蛇中
session['username'] = 'username'
in jinja2 you can go
在 jinja2 你可以去
{{session['username']}}
回答by chikwapuro
If you want to isolate certain parts of your HTML using session you can call the session directly on those elements:
如果您想使用 session 隔离 HTML 的某些部分，您可以直接在这些元素上调用 session：
{% if session['username'] %}
<li>Logout</li>
{% endif %}
回答by user10257507
@bpb101 is correct on the Jinja2 format (though left out the spaces as others have mentioned). In the HTML/Jinja2 template you can simply call the sessiondictionary without passing it to the template:
@bpb101 在 Jinja2 格式上是正确的（尽管省略了其他人提到的空格）。在 HTML/Jinja2 模板中，您可以简单地调用session字典而不将其传递给模板：
{{ session['username'] }}
However the other example, in the Python code, would actually overwrite the value of session['username']with the string 'username', due to variable assignment. If you were trying to set a variable to the value of session['username']you would use:
然而，由于变量赋值，Python 代码中的另一个示例实际上会session['username']用 string覆盖 的值'username'。如果您尝试将变量设置为session['username']您将使用的值：
username = session['username']
Otherwise if you just needed to test or use the value for some other reason you can access it directly for example:
否则，如果您只是出于其他原因需要测试或使用该值，则可以直接访问它，例如：
if session['username'] == some_value:
return "The username is", session['username']
Hopefully that helps for anyone new to Flask or Jinja2 that might wonder why their session variables are being overwritten.
希望这对 Flask 或 Jinja2 的新手有所帮助，他们可能想知道为什么他们的会话变量会被覆盖。
