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我正在研究一個Django項目（Django 1.10，Python 3.4.3），其中我試圖上傳python子進程中的文件。我需要上傳文件，並在上傳文件時計算一些總和，並且我們希望系統在這樣做時仍然可用，所以我們認爲將這些任務放在子進程中是可行的。在python子進程中上傳文件
現在，我正在努力讓文件上傳。
第一次嘗試：
應用程序/視圖/ UploadView.py
class NewUploadView(TemplateView):
template_name = "../templates/simulation/upload.html"
@transaction.atomic
def post(self, request):
if request.method == 'POST':
if not request.FILES['input_file']:
return HttpResponseBadRequest("No 'input_file' is provided")
else:
sim_name = self.request.POST.get(u"name", None)
p = Popen(["/.virtualenvs/env/bin/python3.4", "manage.py",
"load_simulation", str(request.FILES['input_file'],
str(sim_name)])
p.communicate()
# Redirect to appropriate page
HttpResponseRedirect(reverse('home.display_simulations'))`
應用程序/管理/命令/ load_simulation.py
import csv
import os
from django.conf import settings
from django.core.management.base import BaseCommand
from website.apps.home.models import Simulation, Location, Data, SimulationModel
class Command(BaseCommand):
help = 'Upload csv data file and save objects in database'
def add_arguments(self, parser):
parser.add_argument("my_file", type=str)
parser.add_argument("simulation_name", type=str)
def handle(self, *args, **options):
"""
Upload data file
:param args:
:param options:
:return:
"""
my_file = options["my_file"]
simulation_name = options["simulation_name"]
# Save the simulation object, with the data_file
simulation = Simulation.objects.create(name=simulation_name, data_file=my_file)
simulation.save()
filename = os.path.join(settings.MEDIA_ROOT, "simulation_files", simulation.getfilename())
file_obj = open(filename, 'r')
dictreader = csv.DictReader(file_obj)
line = None
for line in dictreader:
location = Location.objects.filter(
department_code=line['department_code'],
municipality_code=line['municipality_code'],
).first()
if not location:
location = Location.objects.create(
department=line['department'],
department_code=line['department_code'],
municipality=line['municipality'],
municipality_code=line['municipality_code'],
)
Data.objects.create(
location=location,
date=line['date'].split(" ")[0], # Assuming date is in "YYYY-MM-DD HH:MM:SS" format
simulation=simulation,
value_low=line['value_low'],
value_mid=line['value_mid'],
value_high=line['value_high'],
)
simulation.is_uploaded = True
simulation.save()
print("DONE WITH LOAD SIMULATION!")
我有設置，以便該文件將被保存在/media/simulation_files目錄。但該文件不會保存到服務器，這意味着它在load_simulation.py文件中失敗，因爲該文件不在該位置，因此該文件嘗試打開該文件。
然後我意識到，我傳遞一個TemporaryFile作爲一個字符串，所以也許這是問題的一部分。
第二次嘗試
我改變了部分UploadView.py把該文件作爲標準輸入英寸
p = Popen(["/.virtualenvs/env/bin/python3.4", "manage.py",
"load_simulation", str(sim_name), is_historical],
stdin=PIPE)
p.communicate(input=request.FILES['output_file'])
和修改load_simulation.py開始如下：
class Command(BaseCommand):
help = 'Upload csv data file and save objects in database'
def add_arguments(self, parser):
parser.add_argument("my_file", type=str)
parser.add_argument("simulation_name", type=str)
def handle(self, *args, **options):
"""
Upload data file
:param args:
:param options:
:return:
"""
simulation_name = options["simulation_name"]
my_file = input()
# Save the simulation object, with the data_file
simulation = Simulation.objects.create(name=simulation_name, data_file=my_file.name)
simulation.save()
filename = os.path.join(settings.MEDIA_ROOT, "simulation_files", simulation.getfilename())
file_obj = open(filename, 'r')
dictreader = csv.DictReader(file_obj)
... same as before ...
這是我從下面的問題/答案了： Python3 subprocess communicate example
這給了我一個錯誤
TypeError: 'InMemoryUploadedFile' does not support the buffer interface
我是新來的子流程的工作，並在接下來嘗試嘗試。我意識到p.communicate()可能並不是這裏的最佳選擇，但我希望這可以使基本功能失效，然後我可以改進它。建議和意見是非常感謝！