Operation

This is the mother class of any operation in general. Sum, Product and Quotient all derive from Operation.

An operation has

• elements (terms in a Sum, factors in a Product...)
• a neutral element (Item(1) for the Product and Quotient, Item(0) for the Sum)
• and a symbol ('+' for Sum, '×' for Product, 'like_a_fraction' or 'use_divide_symbol' for a Quotient)

Fields	Methods (provided)	Methods (must be reimplemented)
element	get_element()	operator()
neutral	get_neutral()
symbol	get_symbol()
	get_iteration_list()
	set_element()
	set_symbol()
	reset_element()
	__get_item__()
	__set_item__()
	is_expandable()
	is_numeric()
	is_literal()

operator() has to be redefined in each instanciated operation (Sum, Product, Quotient). It will make the operation between self and arg and used by evaluate().

Check Operation's complete doc

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