Used model form but formset. It's not appropriate to use formset as ContactForm in this case. ref: ver.53
Removed ContactManager since it's no need more
Fixed some coding style about indent of right brackets
Modified "order_form.html" that removed a fieldset tag
Built AmountForm and be trying AmountFormSet

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Let AmountFormSet display initial value successfully

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Used inheritance to rebuild AmountFormSet in amountformset_factory, and added initial data setting when instantiating amountformset

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Used HTML5 <input> attribute "required" as a polite request to users, and added Product ID field to AmountForm.

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The requirement check of amount field in AmountForm is neccessary at server side.

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Replaced amount field with ChoiceField. Maybe use modelform field with javascript for client side next time?

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I think it should be seperated as pid-amount form and table about pid-name-price

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Finished drawing table with view and template. I find the best way (I think) finally.

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Clarified how validataion of formset works

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Almost ready for AmountFormSet

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Cleaned views.py

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Cleaned models.py

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Cleaned _/urls.py

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Cleaned

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Solved #16

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Solved #15

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