python - 如何在 django web 应用程序中显示 csv 文件的行数和列数

Question

我想从用户那里获取一个 csv 文件，然后只想向用户显示该文件中的行数和列数

testapp.html:

<form method="POST" action="rowcol">
{% csrf_token %}
<input type="file" name="file" accept=".csv">

<button type="submit">Upload text</button>
</form>

views.py:

from django.shortcuts import render
from django.shortcuts import HttpResponse
import numpy as np
import pandas as pd

def testapp(request):
    return render(request, 'testapp.html', {})

def rowcol(request):
    if request.method == 'POST':
        file = request.POST["file"]
        dataset=pd.read_csv('file')
        count_row = dataset.shape[0]
        count_col = dataset.shape[1]
        ans=("<H1>%d,%d</H1>",count_row,count_col)
        return HttpResponse(ans)

url.py:

from django.urls import path
from testapp import views

urlpatterns = [
    path('', views.testapp, name='testapp'),
    path('', views.rowcol, name='rowcol'),
]

外部文件夹中的urls.py:

from django.contrib import admin
from django.urls import path,include

urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('testapp.urls')),
]

Answer 1

这里有一些问题。首先，您的 path(..) 彼此冲突。您需要为第二条路径提供不同的路径。例如:

# testapp/urls.py

from django.urls import path
from testapp import views

urlpatterns = [
    path('', views.testapp, name='testapp'),
    path(<b>'rowcol/'</b>, views.rowcol, name='rowcol'),
]

接下来在模板中，最好使用 {% url ... %} 模板标记，并将 enctype 设置为 multipart/form-data:

<form method="post" action="<b>{% url 'rowcol' %}</b>" <b>enctype="multipart/form-data"></b>
    {% csrf_token %}
    <input type="file" name="file" accept=".csv">
    <button type="submit">Upload text</button>
</form>

最后在你的 View 函数中，你忘记格式化字符串:

def rowcol(request):
    if request.method == 'POST':
        file = request.FILES['file']
        dataset=pd.read_csv(file)
        count_row, count_col = dataset.shape
        ans='<H1>%d,%d</H1>' % (count_row,count_col)
        return HttpResponse(ans)
    return HttpResponse('')