大家好，关于flask_wtf,官网上的实例

from flask_wtf import FlaskForm
from wtforms import StringField
from wtforms.validators import DataRequired

class MyForm(FlaskForm):
    name = StringField('name', validators=[DataRequired()])

第一行这样的引入方式，我怎么尝试不成功？在pytone IDE中提示：

ImportError: cannot import name FlaskForm

如果按常规的引入方式：

from flask_wtf import Form

pythone IDE是没问题，但在pycharm中，会有异常提示：

This inspection detects names that should resolve but don't. Due to dynamic dispatch and duck typing, this is possible in a limited but useful number of cases. Top-level and class-level items are supported better than instance items

以上，求解？

1. 官网的例子是错的吗？

2. pycharm中为什么公有波浪提示？