如何将变量传入Django形式？

from django.shortcuts import render

def my_view(request):
    my_variable = "Hello, World!"
    context = {'my_variable': my_variable}
    return render(request, 'my_template.html', context)

from django.shortcuts import render

def my_view(request, my_variable):
    context = {'my_variable': my_variable}
    return render(request, 'my_template.html', context)

from django.shortcuts import render

def my_view(request):
    if request.method == 'POST':
        my_variable = request.POST.get('my_variable')
        context = {'my_variable': my_variable}
        return render(request, 'my_template.html', context)
    else:
        return render(request, 'my_form.html')