Python 如何在德米尔菲尔德的高射炮上设置use_区域设置？

我一直在尝试为wtform DecimalField设置“use_locale”参数，但似乎没有任何效果，而且几乎没有任何关于如何设置“use_locale”的示例。我查阅了巴贝尔和马尔菲尔德的文件，到目前为止什么都没有

以下是相关代码片段：

init.py:

from flask import Flask, request
from config import Config
from flask_babel import Babel, Locale

app = Flask(__name__)
app.config.from_object(Config)

babel = Babel(app)
locale = Locale('pt', 'BR')

from flask_wtf import FlaskForm
from app import app, db, locale
from wtforms import StringField, BooleanField, SubmitField, TextAreaField, IntegerField, SelectField, DecimalField
from wtforms.validators import ValidationError, DataRequired, EqualTo, Length

class Alterar(FlaskForm):
     valor = DecimalField('ValorTotal', validators=[DataRequired(),Length(min = 1)], use_locale = True)

forms.py:

from flask import Flask, request
from config import Config
from flask_babel import Babel, Locale

app = Flask(__name__)
app.config.from_object(Config)

babel = Babel(app)
locale = Locale('pt', 'BR')

from flask_wtf import FlaskForm
from app import app, db, locale
from wtforms import StringField, BooleanField, SubmitField, TextAreaField, IntegerField, SelectField, DecimalField
from wtforms.validators import ValidationError, DataRequired, EqualTo, Length

class Alterar(FlaskForm):
     valor = DecimalField('ValorTotal', validators=[DataRequired(),Length(min = 1)], use_locale = True)

routes.py

from flask import render_template, flash, redirect, url_for, request
from app import app, db
from app.forms import Alterar
from app.models import Orders
@app.route('/v_info/<id_order>', methods=['GET, POST'])
    def v_info(id_order):
    table = db.session.query(Orders).filter(Orders.id_ord == id_order).first()
    form = Alterar(request.form, obj=table)
    return render_template('v_info.html', data = table, form = form)

我知道bool对象是不可下标的，但是，我应该在“use\u locale”参数中传递什么？文档中有关该类的详细信息：

class wtforms.fields.DecimalField(default field arguments, places=2, rounding=None, use_locale=False, number_format=None)[source]¶

    A text field which displays and coerces data of the decimal.Decimal type.

    Parameters

            places – How many decimal places to quantize the value to for display on form. If None, does not quantize value.

            rounding – How to round the value during quantize, for example decimal.ROUND_UP. If unset, uses the rounding value from the current thread’s context.

            use_locale – If True, use locale-based number formatting. Locale-based number formatting requires the ‘babel’ package.

            number_format – Optional number format for locale. If omitted, use the default decimal format for the locale.

---

如果您只想查看格式化的值，可以定义一个过滤器并将其应用于模板：

from babel.numbers import format_decimal

def FormatDecimal(value):
    return format_decimal(value, locale='de_DE')

jinja2.filters.FILTERS['FormatDecimal'] = FormatDecimal

{{ decimal_value | FormatDecimal }}

如果您想将其添加到输入字段，也许可以尝试使用（不确定是否有效）：

---

我现在使用模板得到这个错误：y文件“c:\anaconda3\lib\site packages\babel\numbers.py”，第804行，在apply value=decimal.decimal（str（value））decimal.invalidooperation:[