Question

我正在尝试填充当前值的表格，然后更改它以寻找原始和之后的差异。我简化了以下代码以复制问题： -

webapp.py

from flask import Flask, render_template
from flask_wtf import FlaskForm
from wtforms import StringField, DecimalField, fields
import pandas as pd

app=Flask(__name__)
app.config['SECRET_KEY'] = 'wtf'

class stockForm(FlaskForm):
    stock=StringField()
    price= DecimalField()

    def __init__(self, csrf_enabled=False, *args, **kwargs):
        super(stockForm, self).__init__(csrf_enabled=csrf_enabled, *args, **kwargs)

class stockListForm(FlaskForm):
    stockItem=fields.FieldList(fields.FormField(stockForm))


@app.route('/sEntry', methods=['GET','POST'])
def sEntry():
    form=stockListForm()
    stocklist=pd.DataFrame(data=[['abc',10.17],['bcd',11.53],['edf',12.19]],columns=['stock','price'])    

    for stock in stocklist.itertuples():
        sForm=stockForm()
        sForm.stock=stock.stock
        sForm.price=stock.price
        form.stockItem.append_entry(sForm)

    if form.validate_on_submit():
        results = []
        for idx, data in enumerate(form.stockItem.data):
            results.append(data)
        print(results)
        del form
        return render_template('results.html', results=results)
    print(form.errors)
    return render_template('sEntry.html',form=form)


if __name__=='__main__':
    app.run(debug=True, use_reloader=True, host='0.0.0.0', port=int('5050'))

sEntry.html

<html lang="en">
  <head>
    <meta charset="utf-8">
  </head>
<body>

    <form action="" method="POST" name="form">
    {{ form.name}}
    {{ form.hidden_tag() }}
    <div>
        <table>
            <thead >
            <tr class="col">
                <th style="width: 30px">stock</th>
                <th style="width: 50px">price</th>
            </tr>
            </thead>
            {% for stock in form.stockItem %}
            <tr class="col">
                <td>{{ stock.stock }}</td>
                <td>{{ stock.price }}</td>
            </tr>
            {% endfor %}
        </table>
    </div>
    <p><input type="submit" name="edit" value="Send"></p>
    </form>
</body>
</html>

results.html

<ul>
{% for line in results %}
    <li>{{ line }}</li>
{% endfor %}

</ul>

如果我要更改一些字段的值，生成的变量结果将包含数据帧中原始3行的6行数据的副本 e.g。

{'price': Decimal('10.17'), 'stock': 'abc'}
{'price': Decimal('13'),    'stock': 'bcd'}
{'price': Decimal('12.19'), 'stock': 'edf'}
{'price': 10.17, 'stock': 'abc'}
{'price': 11.529999999999999, 'stock': 'bcd'}
{'price': 12.19, 'stock': 'edf'}

此外，我也有问题我的原始十进制用于变成一些长浮点值，在上面的例子中，我将bcd值从11.53更改为13，原始值变为长浮点数，其余我没有编辑保持为原始

我可以将结果切成两半并将两半之间的值进行比较，将这些长浮点数四舍五入以找到有变化的值，但效率非常低。

有人可以帮忙吗？

Answer 1

首先，您需要在Pandas Decimal中使用正确的DataFrame类型。（可以通过使用Numpy的dtype和对象来处理Pandas。）

其次，当POST请求发生时，您正在使用原始数据填写表单。

一些固定的视图函数看起来像这样：

@app.route('/', methods=['GET','POST'])
def sEntry():
    # Create form and fill it with request data
    form = stockListForm(request.form)

    # Set up initial data with proper Decimal objects
    stocklist=pd.DataFrame(data=[['abc',Decimal('10.17')],['bcd',Decimal('11.53')],['edf',Decimal('12.19')]],columns=['stock','price'])    

    # Handle valid POST request
    if form.validate_on_submit():
        # Convert form data to dictionary (so we can later easily query stock price)
        stocks = {i['stock']: i['price'] for i in form.stockItem.data}

        # Generate result (as generator) ...
        results = ((i.stock, i.price, i.price - stocks[i.stock]) for i in stocklist.itertuples())

        # ... and push it to template
        return render_template('results.html', results=results)

    print(form.errors)

    # ...build initial form for GET request 
    for stock in stocklist.itertuples():
        sForm=stockForm()
        sForm.stock=stock.stock
        sForm.price=stock.price
        form.stockItem.append_entry(sForm)

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

Flask表单数据在提交时重复

1 个答案: