Question

我试图围绕jinja2 for循环的结果打印一个空白行，但我无法让它工作。有人能告诉我我做错了吗？

from jinja2 import Template, Environment

template = Template("""This is some text that should have a single blank line below it.

{% for i in range(10) -%}
line {{ i }}
{% endfor %}

This is some text that should have a single blank line above it.""")

template.environment = Environment(trim_blocks=True)

print(template.render())

这是我得到的结果：

This is some text that should have a single blank line below it.

line 0
line 1
line 2
line 3
line 4
line 5
line 6
line 7
line 8
line 9


This is some text that should have a single blank line above it.

但是，我尝试对其进行配置，以便我不会在最后一行上方留下两个空行，只有一行。

Answer 1

啊，我把它解决了。我错误地使用了环境。来自文档：

如果不共享此类[Environment]的实例，则可以修改它们的实例模板已加载到目前为止。对环境后的环境进行修改加载第一个模板将导致令人惊讶的效果和未定义的行为。

正确的代码在

之下

def num_to_word(num):
    num_dict = {'0': 'zero', '1': 'one', '2': 'two', '3': 'three', '4': 'four', '5': 'five', '6': 'six', '7': 'seven', '8': 'eight', '9': 'nine'}
    return ' '.join([num_dict[x] for x in str(num)])

结果：

from jinja2 import Environment

template_string = """This is some text that should have a single blank line below it.

{% for i in range(10) -%}
line {{ i }}
{% endfor %}

This is some text that should have a single blank line above it."""

env = Environment(trim_blocks=True)

template = env.from_string(template_string)

print(template.render())

Answer 2

line {{ i }}打印文本后跟换行符，然后你有一个空行，这使得它成为两行。只需删除一个空行：

template = Template("""This is some text that should have a single blank line below it.

{% for i in range(10) -%}
line {{ i }}
{% endfor %}
This is some text that should have a single blank line above it."""

使用jinja2模板中的空白控件修剪块

2 个答案: