Question

我正在Django中编写一个程序，以比较两个上载的文件，找到正确的差异，分别标记这些差异，并产生输出。该程序将查找是否有“已添加”，“已更改”或“已删除”的内容。当前，“已删除”不起作用（功能和标记明智）。该程序也不会分别打印差异（明智的选择），因此它知道（功能）“已添加”和“已更改”，它只是始终将结果打印为“已更改”。这是 views.py

from django.shortcuts import render
from django.http import HttpResponse
import difflib
import datetime
import csv
from django.http import HttpResponseRedirect
from django.http import FileResponse
from .forms import FileForm
from .forms import UploadFileForm

def handle_uploaded_file(file1,file2): # handle_uploaded_file is a function that takes 2 files uploaded by the users
    fileone = file1.readlines() # define fileone and read lines from 1st file
    filetwo = file2.readlines() # define filetwo and read lines from 2nd file
    fileone =[line.decode("utf-8").strip() for line in fileone]
    filetwo =[line.decode("utf-8").strip() for line in filetwo]
    header = fileone[0].strip().split(',')
    # print(header)
    csv_old = [x.strip().split(',') for x in fileone[1:]]
    # print(csv_old)
    old_keys = [x[0] for x in csv_old]
    old_rows = {}
    for row in csv_old:
        key = row[0]
        if key in old_rows:
            old_rows[key].append(row)
        else:
            old_rows[key] = [row]

    csv_new = [x.strip().split(',') for x in filetwo[1:]]
    new_rows = []
    unchanged_rows = []
    changed_rows = []
    deleted_rows = []
    new_keys = {}
    for row in csv_new:
        key = row[0]

        if key in new_keys:
            new_keys[key].append(row)
        else:
            new_keys[key] = [row]

        if key in old_keys:
            if row in old_rows[key]:
                unchanged_rows
            else:
                changed_rows.append(['Changed'] + row)
        else:
            new_rows.append(['Added'] + row)

    for row in csv_old:
        key = row[0]
        if key not in new_keys:
            deleted_rows.append(['Deleted'] + row)

    print(sorted(unchanged_rows + changed_rows + new_rows + deleted_rows, key=lambda x: x[1:]))
    with open('results.csv', 'w') as f_output:
        csv_output = csv.writer(f_output, delimiter=',', lineterminator='\r')
        csv_output.writerow(['History'] + header)
        csv_output.writerows(sorted(unchanged_rows + changed_rows + new_rows + deleted_rows, key=lambda x: x[1:]))

def index(request): # index is a function for the upload button
    if request.method == 'POST': # POST method inserts something to the server
        print(request.FILES)
        form = UploadFileForm(request.POST, request.FILES)
        print(form.errors)
        if form.is_valid():
            print("cool")
            handle_uploaded_file(request.FILES.get('file1'),request.FILES.get('file2'))
            return HttpResponseRedirect('results/')
    else:
        form = UploadFileForm()
    return render(request, 'hello.html', {'form': form})

def results(request): # results is a function that sends difference.csv back to the user once the file is ready
    file_path = (r'C:\Users\Public\Documents\PycharmProjects\filecomparison\results.csv') #  adding an absolute path in the server, pinpoints that exact file, very important, r is to produce raw string and handle unicodeescape error
    response = FileResponse(open(file_path, 'rb'))
    response['Content-Type'] = 'text/csv' # the type of the file that will be send is .txt/.csv
    response['Content-Disposition'] = 'attachment; filename=results.csv' # produces an attachment file for users to download called with difference in .csv file
    return response

我附上了结果图片和测试文件，以帮助您理解。如果您查看图片，您将看到3个“更改”结果，它们不一定是正确的，因为它们在标记方面是错误的（应该在最后一条记录中“添加”），并且它们是程序应该在results.csv中打印了3个“已删除”记录（对于VARIANDY RACHMAN）。

抱歉，我不了解Python。非常感谢您的帮助！

django程序产生错误的输出

0 个答案: