Python Jinja/Flask 中的字符串长度

Length of string in Jinja/Flask

提问by wuxiekeji

Jinja unfortunately does not support executing arbitrary Python code, such as

不幸的是，Jinja 不支持执行任意 Python 代码，例如

{% if len(some_var)>1 %} ... {% endif %}

My current workaround is to use the deprecated, ugly, double-underscore method:

我目前的解决方法是使用已弃用、丑陋、双下划线的方法：

{% if some_var.__len__()>1 %} ... {% endif %}

Although this works, I'm afraid that some future implementation of strings might break this code. Is there a better way to do this?

虽然这有效，但我担心字符串的某些未来实现可能会破坏此代码。有一个更好的方法吗？

采纳答案by Martijn Pieters

You can use the lengthfilter:

您可以使用length过滤器：

{% if some_var|length > 1 %}