如何获取此值？DJANGO

def my_view(request):
    value = request.GET.get('key', 'default_value')
    # 使用value做进一步处理

def my_view(request):
    if request.method == 'POST':
        value = request.POST.get('key', 'default_value')
        # 使用value做进一步处理

from myapp.models import MyModel

def my_view(request):
    instance = MyModel.objects.get(id=1)
    value = instance.my_field
    # 使用value做进一步处理

from django import forms

class MyForm(forms.Form):
    my_field = forms.CharField()

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            value = form.cleaned_data['my_field']
            # 使用value做进一步处理

# urls.py
from django.urls import path
from .views import my_view

urlpatterns = [
    path('my-url/<int:id>/', my_view, name='my_view'),
]

# views.py
def my_view(request, id):
    # 使用id做进一步处理

value = request.GET.get('key', 'default_value')
# 或者
try:
    instance = MyModel.objects.get(id=1)
except MyModel.DoesNotExist:
    instance = None

values = request.GET.getlist('key')