I want to customize the UserCreationForm from django. I do the following
class myUserCreationForm(UserCreationForm):
    class Meta:
        model=User
        fields = ('username', 'password1', 'password2')
        widgets = {
            'username':TextInput(attrs={'class':'form-control'}),
            'password':TextInput(attrs={'class':'form-control'}),
            'password2':TextInput(attrs={'class':'form-control'}),
}
but its not working. When the template is rendered It creates the input boxes don't have the form-control class attached to them. What could be wrong?
Just stumbled upon this as I was facing the same issue. You can just overwrite the init method on the myUserCreationForm class to set the attributes for the form.
class myUserCreationForm(UserCreationForm):
    class Meta:
        model=User
        fields = ('username', 'password1', 'password2')
     def __init__(self, *args, **kwargs):
        super(myUserCreationForm, self).__init__(*args, **kwargs)
        self.fields['username'].widget.attrs['class'] = 'form-control'
        self.fields['password1'].widget.attrs['class'] = 'form-control'
        self.fields['password2'].widget.attrs['class'] = 'form-control'
You should override fields above class Meta. This works for me:
class CustomCreateUserForm(UserCreationForm):
username = forms.RegexField(
    label=_("Login"), max_length=30, regex=r"^[\w.@+-]+$",
    help_text=_("Required. 30 characters or fewer. Letters, digits and "
                "@/./+/-/_ only."),
    error_messages={
        'invalid': _("This value may contain only letters, numbers and "
                     "@/./+/-/_ characters.")},
    widget=TextInput(attrs={'class': 'form-control',
                            'required': 'true',
                            'placeholder': 'Login'
    })
)
password1 = forms.CharField(
    label=_("Password"),
    widget=forms.PasswordInput(attrs={'class': 'form-control',
                                      'required': 'true',
    })
)
password2 = forms.CharField(
    label=_("Password confirmation"),
    widget=forms.PasswordInput(attrs={'class': 'form-control',
                                      'type': 'password',
                                      'required': 'true',
    }),
    help_text=_("Enter the same password as above, for verification.")
)
first_name = forms.CharField(
    label=_("Name"),
    widget=forms.TextInput(attrs={'class': 'form-control',
                                  'type': 'text',
                                  'required': 'true',
    }),
    help_text=_("Enter user first and last name.")
)
email = forms.CharField(
    label=_("Email"),
    widget=forms.TextInput(attrs={'class': 'form-control',
                                  'type': 'email',
                                  'placeholder': 'Email address',
                                  'required': 'true'
    })
)
class Meta:
        model = User
You need to create your form from sctratch, it should not extend the UserCreationForm. The UserCreationForm have a username field explicitly defined in it as well as some other fields. You can look at it here.
class myUserCreationForm(UserCreationForm):
    password1 = forms.CharField(
        label='Password',
        widget=forms.PasswordInput(attrs={'class': 'form-control'})
    )
    password2 = forms.CharField(
        label='Password',
        widget=forms.PasswordInput(attrs={'class': 'form-control'})
    )
    class Meta:
        model = User
        fields = ('username', 'password1', 'password2')
        widgets = {
            'username': TextInput(attrs={'class': 'form-control'}),
            # 'password': TextInput(attrs={'class': 'form-control'}),   # Remove This Line
            # 'password2': TextInput(attrs={'class': 'form-control'}),  # Remove This Line
        }
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