文件关闭后不更新

我在这里问了一些与我正在处理的Django项目相关的问题,该项目以表单的形式显示文件的内容,您可以使用表单编辑文件,当您提交时,项目将写入文件并自动反映更改。

我怀疑这与文件“关闭”后由于某种原因仍保持打开状态有关。我试图通过为所有读写操作(也关闭文件)创建函数来解决这个问题,这样每次需要读写时都可以调用它们。这个问题仍然存在。有什么我做得不对吗?文件还在我找不到的地方吗?下面的资源。

链接到项目: https://repl.it/@xMikee/Calendar ( )

视图.py

from django.shortcuts import render
from django.contrib import messages
from .forms import FileForm
import sys

f = open('calendar.txt', "r")
file_content = f.read()
f.close()
if f.closed:
  print("CLOSED FILE from read views")

def writeFile(content, file):
  f = open(file, "w")
  f.write(content)
  f.close()
  if f.closed:
    print("CLOSED FILE from write views")

def home(request):
  return render(request, 'main/index.html',{'file_content':file_content})

def form_get(request):
  print('got form')
  if request.method == 'POST':
    print("OK")
    # create a form instance and populate it with data from the request:
    form = FileForm(request.POST)
    # check whether it's valid:
    if form.is_valid():
      print("OK")
      cd = form.cleaned_data['form']
      writeFile(cd, 'calendar.txt')
  else:
    print('NOT OK')
    form = FileForm()
  return render(request, 'main/index.html', {'form': form})

def thanks(request):
  # if this is a POST request we need to process the form data
  if request.method == 'POST':
    print("OK")
    # create a form instance and populate it with data from the request:
    form = FileForm(request.POST)
    # check whether it's valid:
    if form.is_valid():
      print("OK")
      cd = form.cleaned_data['form']
      print(cd)
      f = open('calendar.txt', 'r+')
      f.write(cd)
      f.close()
  else:
    print('NO POST')
    form = FileForm()
  return render(request, 'main/index.html', {'form': form})

from django import forms
global cd

f = open('calendar.txt', "r")
file_content = f.read()
f.close()
if f.closed:
  print("CLOSED FILE from read views")

class FileForm(forms.Form):
  form = forms.CharField(label='',initial=file_content,widget=forms.Textarea(attrs={'width':"100%", 'cols' : "102", 'rows': "40", }))

索引.html

{% extends "base.html" %}

{% block content %}
  <h1 style='text-align:center'>Welcome to the calendar!</h1>
  <div style='text-align:center'>
  <form action="#" method="post">
    {% csrf_token %}
    {{ form }}
    <div style='margin: 0 auto'>
    <input type="submit" value="Submit">
    </div>
  </form>
  <p>{{cd}}</p>
  </div>
{% endblock content %}