我试图创建一个视图来上传一个。csv文件并在模板上解析它，但是它返回了一个

MultiValueDictKeyError at /
“文件”
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模板具有
<form method="POST" enctype="multipart/form-data">{% csrf_token %}
<div class="file-field input-field">
<div class="btn">
<span>Upload a CSV FILE</span>
<input type="file" name="file">
</div>
<div class="file-path-wrapper">
 <input class="file-path validate" type="text">
</div>
<button class="waves-effect waves-light btn teal" type="submit">Upload</button>
</div>
</form>
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那么我的观点
import csv, io
from django.shortcuts import render
from django.contrib import messages

def data_upload(request):
    template = "home.html"

    if request.method == 'GET':
        return render(request, template)

    csv_file = request.FILES['file']
    if not csv_file.name.endswith('.csv'):
        messages.error(request, 'Please upload a .csv file.')

    data_set = csv_file.read().decode('UTF-8')
    io_string = io.StringIO(data_set)
    next(io_string)
    for column in csv.reader(io_string, delimiter=',', quoteschar="|"):
        _, created = Table.objects.update_or_create(
            page=column[0], 
            keyword=column[1], 
            interval=column[2], 
            email=column[3], 
            billing=column[4], 
            notes=column[5],
        )
    context = {}
    return render(request, template, context)
我想知道为什么它返回错误（？）。