当我尝试分配一个form.clean_data ['value']时，我收到一个KeyError我试图在django web app中编写一个兴趣计算器脚本，它接受用户输入的初始资本年份和费率并计算最终资本，但是它返回一个关键错误db是sqlite3
任何帮助在解决方案和设计作为初学者和所有..
这是追溯
追溯：
文件“/Users/Andras/miniconda3/lib/python3.5/site-packages/django/core/handlers/exception.py”在内部39. response = get_response（request）
文件“/Users/Andras/miniconda3/lib/python3.5/site-packages/django/core/handlers/base.py”在_get_response 187. response = self.process_exception_by_middleware（e，request）
_get_response 185中的文件“/Users/Andras/miniconda3/lib/python3.5/site-packages/django/core/handlers/base.py”.response = wrapped_callback（request，* callback_args，** callback_kwargs）
查询37中的文件“/Users/Andras/myproject/myapp/views.py”.initial = form.cleaned_data ['initial']
异常类型：KeyError at / query / Exception值：'initial'
views.py
from django.shortcuts import redirect
from django.shortcuts import get_object_or_404, render
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.http import HttpResponseRedirect
from django.urls import reverse
from django.views import generic
from django.template.loader import get_template
from django.template import Context
from django.views.generic.base import TemplateView
from myapp.models import Queries
from django.core import serializers
import os, re, math
from django.template import Context
from django.views.generic import View
from django import forms
from myapp.forms import QueriesForm
import decimal
from django.http import Http404
def get_final(initial, rate, years):
initial = self.initial
rate = self.rate
years = self.years
calcInterest = (initial*(1+((rate/100)/12))^(12*years))
final = calcInterest
return final
def query(request):
if request.method == 'POST':
form = QueriesForm(request.POST)
if form.is_valid():
initial = form.cleaned_data['initial']
rate = form.cleaned_data['rate']
years = form.cleaned_data['years']
init1 = Queries.objects.get_initial()
rate1 = Queries.objects.get_rate()
years1 = Queries.objects.get_years()
final1 = get_final(init1, rate1, years1)
return render (request, 'result.html', {'cacl':final1})
else:
raise Http404
else:
form = QueriesForm()
return render(request, 'index.html', {'form': form})
def index(request):
template_name = 'index.html'
return render(request, "index.html", {})
def queries(request):
template_name = 'queries.html'
return render(request, "queries.html", {})
def result(request):
template_name = 'result.html'
return render(request, "result.html", {})
forms.py
from django import forms
from .models import Queries
class QueriesForm(forms.Form):
initial = forms.NumberInput(attrs={'max_lenght':10, 'requred':True})
years = forms.NumberInput(attrs={'max_lenght':10, 'requred':True})
rate = forms.NumberInput(attrs={'max_lenght':10, 'requred':True})
def clean_message(self):
initial = self.cleaned_data.get("initial")
years = self.cleaned_data.get("years")
rate = self.cleaned_data.get("rate")
class Meta:
model = Queries
fields = ('initial', 'years', 'rate',)
models.py
from django.db import models
from django.forms import ModelForm
class Queries(models.Model):
initial = models.DecimalField(max_digits=3, decimal_places = 2)
years = models.DecimalField(max_digits=3, decimal_places = 2)
rate = models.DecimalField(max_digits=3, decimal_places = 2)
def get_initial(self):
return self.initial
def get_years(self):
return self.years
def get_rate(self):
return self.rate
urls.py
from django.conf.urls import url
from . import views
app_name = 'myapp'
urlpatterns = [
url(r'^$', views.index, name = 'index'),
url(r'^queries/', views.queries, name = 'queries'),
url(r'^query/', views.query, name = 'query')
]
的index.html
{% load staticfiles %}
<!DOCTYPE html>
<head>
<title>My Cool Savings Calculator</title>
<style>
h1 {
padding-bottom: 0em;
margin-bottom: 0em;
}
table {
padding-top: 0em;
margin-top: 0em;
}
</style>
</head>
<body>
<h1>Savings Calculator</h1>
<table>
<form name = "form" action = "{% url 'myapp:query' %}" method='POST'>{% csrf_token %}
<tr>
<td><label>Initial Capital:</label>
<td><input type='number' name='initial'></input></td>
</tr>
<br>
<tr>
<td><label>Number of Years:</label>
<td><input type='number' name='years' value='5'></input></td>
</tr>
<br>
<tr>
<td><label>Interest rate (annual):</label>
<td><input type='number' name='rate' value='3.5'></input></td>
</tr>
<br>
<tr>
<td></td>
<td><input type='submit'></input></td>
</tr>
</form>
</table>
{% block content %}
{% endblock %}
<h3>Check previous queries <a href='/queries'>here</a></h3>
</body>
results.html
{% extends 'index.html' %}
{% block content %}
<h2>{{calc}}</h2>
{% endblock %}
2 回答
如上所述，您可能需要更正表单字段中max_length的拼写和所需的拼写 .
然后我还认为你需要实际输出表单而不是常规的html输入 .
然后也在你的views.py查询函数中，它抛出你可能想要使用的错误.get带有一个回退值 .
您的attrs参数中存在拼写错误，这可能是导致此问题的原因 .
尝试更改这三行：
对此：