[Python]使用WTForms处理可变长的表单

form中的元素会变多。
比如有一个表格：
我喜欢的东西： 可以增加任意个物品（这几个物品填在不同的框），然后提交。
实现这个需求，需要用到FieldList

from wtforms import Form
from wtforms.fields import FieldList, StringField
class MyForm(Form):
    names = FieldList(StringField('名称'), label='物品列表', min_entries=1)

names-0=苹果
names-1=梨
names-2=香蕉

{"names": ["苹果", "梨", "香蕉"]}

print(form.names.data)
# ['苹果', '梨', '香蕉']

from wtforms import Form
from wtforms.fields import FieldList, FormField, StringField, IntegerField
class ProductForm(Form):
    name = StringField('名称')
    count = IntegerField('数量')
class MyForm(Form):
    products = FieldList(FormField(ProductForm), label='产品列表', min_entries=1)

products-0-name=Iphone6
products-0-count=1
products-1-name=小米手机
products-1-count=2

{"products": [{"name": "Iphone6", "count": 1}, {"name": "小米手机", "count": 2}]}

print(form.products.data)
# [{'name': 'Iphone6', 'count': 1}, {'name': '小米手机', 'count': 2}]