Question

我正在尝试构建预算网络应用程序，主要用于实践，但是我也希望它成为我的主要预算工具。我不太擅长Python，但我想成为。

我度过了一段艰难的时期，这就是为什么我转向你们。

这是我的budget.py代码：

from flask import Flask, render_template, request
app = Flask(__name__)


@app.route('/', methods=['POST', 'GET'])
def entry():
    return render_template('entry.html',
                           the_title='Smith Family Budgeting')

@app.route('/income', methods=['POST', 'GET'])
def income():
    return render_template('income.html')

@app.route('/housing', methods=['POST', 'GET'])
def results():
    if request.method == 'POST':
        income = request.form["income"]
        return render_template('housing.html', the_income = income)

@app.route('/transportation', methods=['POST', 'GET'])
def transport():
    if request.method == 'POST':
        income = request.form["income"]
        mortgage = request.form['housing']
        leftover = int(income) - int(mortgage)
        return render_template('trans.html', leftover=leftover)


app.run(debug = True)

html for housing.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Allocating for housing</title>
</head>
<body>
<p>You have ${{  the_income  }} left to spend!</p>
<form action="/transportation">
    <p>How much is the mortgage this month?</p>
    <input name="housing" type="TEXT">
    <p>Next up: Transportation</p>
    <input type="SUBMIT" value="Next">
</form>
<form action="/income">
    <input type="SUBMIT" value="Back">
</form>
</body>
</html>

从外观上您可能会看到，用户通过输入每个类别的数据来浏览应用程序。我想保持剩余预算的不断增长，但我正努力超越第一部分。

flask调用/ transportation页时，出现“ TypeError：view函数未返回有效响应。该函数返回None或不返回return语句而结束。”

我不确定为什么会这样，尽管我怀疑这与“剩余”变量有关。我怀疑也许减去两个不同表单数据的值不是解决此问题的正确方法，但我不确定是什么。欢迎任何建议！

我可以发布模板，尽管我不确定解决这些模板是否需要它们。非常感谢你们，我真的很高兴这个资源存在。

Answer 1

使用session将数据传递到下一条路线，并在用户返回到收入页面时清除会话

将url_for用于表格action

在budget.py

from flask import Flask, render_template, request, session
app = Flask(__name__)
app.secret_key = "super_secret_key"

@app.route('/', methods=['GET'])
def entry():
        return render_template('entry.html',
                           the_title='Smith Family Budgeting')

@app.route('/income', methods=['GET'])
def income():
        session['income'] = ''
        return render_template('income.html')

@app.route('/housing', methods=['POST'])
def results():
        if request.method == 'POST':
                session['income'] = request.form["income"]
                return render_template('housing.html', the_income=session['income'])

@app.route('/transportation', methods=['POST'])
def transport():
        if request.method == 'POST':
                income = session["income"]
                mortgage = request.form['housing']
                leftover = int(income) - int(mortgage)
                return render_template('trans.html', leftover=leftover)

app.run(debug = True)

在housing.html中编辑表格action和method

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Allocating for housing</title>
</head>
<body>
<p>You have ${{  the_income  }} left to spend!</p>
<form action="{{ url_for('transport') }}" method="POST">
    <p>How much is the mortgage this month?</p>
    <input name="housing" type="TEXT">
    <p>Next up: Transportation</p>
    <input type="SUBMIT" value="Next">
</form>
<form action="{{ url_for('income') }}">
    <input type="SUBMIT" value="Back">
</form>
</body>
</html>

烧瓶返回None，request.form可能存在问题

1 个答案: