如何让iexfianacestock从表单数据中获取输入？

Question

我想从IEXFiance得到股票价格。当我尝试运行这个时，我得到了ValueError: Please input a symbol or list of symbols。我如何使s=Stock()从表单中获取输入？我试着把输入改成一个字符串，但是没有成功，因为它已经是一个字符串了。请帮忙！！你知道吗

class InvestmentForm(Form):
    stockSymbol = StringField('Stock Symbol', validators=[InputRequired(), Length(min=2, max=5 ,message='Please Enter Correct 
    symbol')])
    allotment = FloatField('Allotment', validators=[InputRequired()])
    finalSharePrice = FloatField('Final Share Price', validators=[InputRequired()])
    sellCommision = FloatField('Sell Commision',validators=[InputRequired()])
    initialSharePrice = FloatField('Initial Share Price', validators=[InputRequired()])
    buyCommission = FloatField('Buy Commission', validators=[InputRequired()])


@app.route("/",methods=['GET','POST'])
def index():
    form = InvestmentForm()
    userInput = form.stockSymbol.data
    s = Stock(userInput)
    print(s.get_price())
    return render_template('home.html',form=form)

Answer 1

我认为错误的原因是，当用户输入不可用时，您试图在GET请求中提取form.stockSymbol.data。尝试更改代码，以便区分GET和POST，如下所示：

from flask import request
@app.route("/",methods=['GET','POST'])
def index():
    form=investmentform()

    if request.method == 'POST':
        userInput = form.stockSymbol.data
        s = Stock(userInput)
        print(s.get_price())

    return render_template('home.html',form=form)

Answer 2

您必须提交表单输入数据，在InvestmentForm中添加一个submit = SubmitField()。确保在form = InvestmentForm(request.form)中传递request.form，或者只使用Flask-WTF。你知道吗

class InvestmentForm(Form):
    submit = SubmitField()

@app.route("/", methods=['GET', 'POST'])
def index():
    form = InvestmentForm(request.form)
    if request.method == 'POST' and form.validate():
        user_input = form.stockSymbol.data
        s = Stock(user_input)
        print(s.get_price())
return render_template('home.html', form=form)