如何在Django应用程序的表单中获取登录用户的名称，并将结果用作表单域的输入？

# forms.py

from django import forms

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

    def __init__(self, user, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.user = user
        self.fields['username'].initial = self.user.username

# views.py

from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.user, request.POST)
        if form.is_valid():
            # 处理表单数据
            pass
    else:
        form = MyForm(request.user)
    
    return render(request, 'my_template.html', {'form': form})