TypeError: validate_on_submit() missing 1 required positiona

在flask开发中遇到提示错误为：TypeError: validate_on_submit() missing 1 required positional argument: 'self'

代码：

from?flask?import?Flask,?request,?render_template,?session,?redirect,?url_for
from?flask_bootstrap?import?Bootstrap
from?flask_wtf?import??Form
from?wtforms?import?StringField,?SubmitField
from?wtforms.validators?import?DataRequired

app?=?Flask(__name__)
app.config['SECRET_KEY']?=?'hard?to?guess?string'
bootstrap?=?Bootstrap(app)

class?NameForm(Form):
????name?=?StringField('What?is?you?name?',?validators=[DataRequired()])
????submit??=?SubmitField('submit')

@app.route('/',?methods=['GET',?'POST'])
def?index():
????name?=?None
????form?=?NameForm
????if?form.validate_on_submit():
????????name?=?form.name.data
????????form.name.data?=?''
????????return?redirect(url_for('index'))
????return?render_template('index.html',?form=form,?name=session.get('name'))


if?__name__?==?'__main__':
????app.run(debug=True)

解决方法：第十八行代码中 form=NameForm 更改为

form?=?NameForm()

（编辑：李大同）

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