我正在使用flask_babel对python项目进行本地化。当从模板中提取可翻译字符串时，它被放在｛｛_(''(｝｝中，我得到了以下错误。如果你们中的任何人都能解决这个问题，请在这里分享解决方案。提前谢谢。
Traceback (most recent call last):
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 2069, in __call__
return self.wsgi_app(environ, start_response)
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 2054, in wsgi_app
response = self.handle_exception(e)
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 2051, in wsgi_app
response = self.full_dispatch_request()
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 1501, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 1499, in full_dispatch_request
rv = self.dispatch_request()
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/app.py", line 1485, in dispatch_request
return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
File "/mnt/c/Users/Lungsang/Desktop/new-pyrrha/pyrrha/app/main/views/index.py", line 34, in index
return render_template_with_nav_info('main/index.html')
File "/mnt/c/Users/Lungsang/Desktop/new-pyrrha/pyrrha/app/main/views/utils.py", line 60, in render_template_with_nav_info
return render_template(template, **kwargs)
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/templating.py", line 147, in render_template
return _render(
File "/home/lungsang/.local/lib/python3.8/site-packages/flask/templating.py", line 128, in _render
rv = template.render(context)
File "/home/lungsang/.local/lib/python3.8/site-packages/jinja2/environment.py", line 1289, in render
self.environment.handle_exception()
File "/home/lungsang/.local/lib/python3.8/site-packages/jinja2/environment.py", line 924, in handle_exception
raise rewrite_traceback_stack(source=source)
File "/mnt/c/Users/Lungsang/Desktop/new-pyrrha/pyrrha/app/templates/main/index.html", line 1, in top-level template code
{% extends 'layouts/base.html' %}
File "/mnt/c/Users/Lungsang/Desktop/new-pyrrha/pyrrha/app/templates/layouts/base.html", line 36, in top-level template code
{% block content %}{% endblock %}
File "/mnt/c/Users/Lungsang/Desktop/new-pyrrha/pyrrha/app/templates/main/index.html", line 5, in block 'content'
<h1>{{ _('Welcome to Pyrrha !') }}</h1>
File "/home/lungsang/.local/lib/python3.8/site-packages/jinja2/utils.py", line 81, in from_obj
if hasattr(obj, "jinja_pass_arg"):
jinja2.exceptions.UndefinedError: '_' is undefined
#主应用程序文件
from flask_login import current_user
from flask import request , Flask
from flask_babel import Babel
from .utils import render_template_with_nav_info
from .. import main
from ...models import Corpus
from ...utils.pagination import int_or
app = Flask(__name__)
app.config['BABEL_DEFAULT_LOCALE'] = 'en'
babel = Babel(app)
@babel.localeselector
def get_locale():
#return request.accept_languages.best_match(['es', 'fr', 'en'])
return 'bo_CN'
@main.route('/')
def index():
if current_user.is_authenticated and not
current_user.is_anonymous:
corpora = Corpus.for_user(current_user, _all=False).paginate(
page=int_or(request.args.get("page"), 1),
per_page=20 # ToDo: Should it be hardcoded ?
)
return render_template_with_nav_info("main/index_loggedin.html", corpora=corpora)
return render_template_with_nav_info('main/index.html')
模板文件(index.html(
{% extends 'layouts/base.html' %}
{% block content %}
<div class="ui text container">
<h1>{{ _('Welcome to Pyrrha !') }}</h1>
<p>Pyrrha is a simple Python Flask WebApp to fasten the post-correction of lemmatized and morpho-syntactic tagged corpora.</p>
<p>It is under active development at the <a href="http://www.chartes.psl.eu">École Nationale des Chartes</a> and can
be found on <a href="https://github.com/hipster-philology/pyrrha">github</a>.</p>
<p>To cite it in a paper, please use the information available on <a href="https://doi.org/10.5281/zenodo.2325427">Zenodo</a></p>
</div>
{% endblock %}
在init.py模块中应用以下代码后，其工作正常。谢谢
babel = Babel(app)
@babel.localeselector
def get_locale():
return 'es'
删除"_"；在模板文件中的h1标签中