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# forms.py
from django import forms

class MyForm(forms.Form):
    username = forms.CharField()
    password = forms.CharField(widget=forms.PasswordInput)

    def clean_username(self):
        username = self.cleaned_data['username']
        # 鑷畾涔夐獙璇佽鍒?/span>
        if not username.isalnum():
            raise forms.ValidationError("鐢ㄦ埛鍚嶅彧鑳藉寘鍚瓧姣嶅拰鏁板瓧")
        return username

# views.py
from django.shortcuts import render
from .forms import MyForm

def my_view(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        if form.is_valid():
            # 澶勭悊琛ㄥ崟鏁版嵁
            username = form.cleaned_data['username']
            password = form.cleaned_data['password']
            # 鍏朵粬鎿嶄綔...
        else:
            # 琛ㄥ崟楠岃瘉澶辫触
            return render(request, 'my_template.html', {'form': form})
    else:
        form = MyForm()
    
    return render(request, 'my_template.html', {'form': form})

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