def add_pension(graph, name, employee_contribution, salary_edge, employer_contribution, interest_rate): pension_pot = zaigen.Node(name + '_pension_pot', node_type='asset') interest_in_node = zaigen.Node(name + '_pension_growth', node_type='source') pension_contrib_node = zaigen.Node(name + '_pension_contrib', node_type='source') graph.add_node(pension_pot) graph.add_node(interest_in_node) graph.add_node(pension_contrib_node) # Make sure to add the edges in the right order graph.add_edge(zaigen.Edge(name + '_pension_payment', graph.current_node, pension_pot, zaigen.weights.Fraction(employee_contribution))) graph.add_edge(zaigen.Edge(name + '_pension_interest', interest_in_node, pension_pot, zaigen.weights.Interest(interest_rate))) graph.add_edge(zaigen.Edge(name + '_pension_contrib', pension_contrib_node, pension_pot, zaigen.weights.EdgeLinked(employer_contribution, graph.get_edge(salary_edge)))) add_transfer(graph)
def add_final_savings(graph):
new_end_node = zaigen.Node('savings', node_type='asset')
graph.add_node(new_end_node)
graph.add_edge(zaigen.Edge('transfer',
graph.current_node,
new_end_node,
zaigen.weights.Fraction(1)))
graph.current_node = new_end_node
interest_in_node = zaigen.Node('interest_in', node_type='source')
graph.add_node(interest_in_node)
graph.add_edge(zaigen.Edge('saving_growth',
interest_in_node,
new_end_node,
zaigen.weights.Interest(0.01)))
def add_transfer(graph):
new_end_node = zaigen.Node('inter')
graph.add_node(new_end_node)
graph.add_edge(zaigen.Edge('transfer',
graph.current_node,
new_end_node,
zaigen.weights.Fraction(1)))
graph.current_node = new_end_node
def add_tax(graph, rate):
tax_out = zaigen.Node('tax_out', node_type='sink')
graph.add_node(tax_out)
graph.add_edge(zaigen.Edge('tax',
graph.current_node,
tax_out,
zaigen.weights.Fraction(rate)))
add_transfer(graph)
def add_salary(graph, name, value):
in_node = zaigen.Node('in', node_type='source')
inter_node = zaigen.Node('inter')
graph.add_node(in_node)
graph.add_node(inter_node)
graph.add_edge(zaigen.Edge(name,
in_node,
inter_node,
value))
graph.current_node = inter_node
def add_mortgage(graph, principal, term, rate):
mortgage = zaigen.Node('mortgage')
mortgage.value = -principal
mortgage_interest_payments = zaigen.Node('mortgage_interest', node_type='sink')
mortgage_repayment = zaigen.weights.Constant(
zaigen.util.calculate_mortage_repayment(principal, term, rate))
mortgage_interest = zaigen.weights.Interest(rate)
graph.add_node(mortgage)
graph.add_node(mortgage_interest_payments)
graph.add_edge(zaigen.Edge('mortgage_repayments',
graph.current_node,
mortgage,
mortgage_repayment))
graph.add_edge(zaigen.Edge('mortgage_interest',
mortgage_interest_payments,
mortgage,
mortgage_interest))
add_transfer(graph)
def join_graphs(graph1, graph2):
node1 = graph1.current_node
node2 = graph2.current_node
new_node = zaigen.Node('inter')
for node in graph2.nodes:
graph1.add_node(node)
for edge in graph2.edges:
graph1.add_edge(edge)
graph1.add_node(new_node)
graph1.add_edge(zaigen.Edge('transfer',
node1,
new_node,
zaigen.weights.Fraction(1)))
graph1.add_edge(zaigen.Edge('transfer',
node2,
new_node,
zaigen.weights.Fraction(1)))
graph1.current_node = new_node
def add_expense(graph, name, value, schedule): expense_out = zaigen.Node(name + '_expense_out', node_type='sink') weight = zaigen.weights.Constant(value) weight.schedule = schedule graph.add_node(expense_out) graph.add_edge(zaigen.Edge(name + '_expense', graph.current_node, expense_out, weight)) add_transfer(graph)