import random

def run_simulation(annual_spend, inflation_rate, savings_balance, interest_rate, num_years, inflation_change, interest_change):
# Store savings in list
savings = []
# For each year:
for year in range(num_years):
   # Update the annual spend by inflation rate
   annual_spend *= (1 + inflation_rate)
   # Reduce the savings balance by the annual spend
   savings_balance -= annual_spend
   # Update the savings balance by interest rate
   savings_balance *= (1 + interest_rate)
   # Add savings balance to savings in list
   savings.append(savings_balance)
   # Update inflation rate
   inflation_rate = modify_rate(inflation_rate, inflation_change)
   # Update interest rate
   interest_rate = modify_rate(interest_rate, interest_change)
# Return savings in list
return savings

def modify_rate(rate, change):
"""
   Calcualate a random value within the change of given rate

   Arguments:
   rate -- The intial rate to change from
   change -- The maximum amount to change of the given rate

   Returns a random value within change of the given rate

   Explation:
   random.random() calculates a random value between o and 1.
   Thus random.randm()*2 gives a value between 0 and 2,
   so 1 - random.random()*2 gives a value between -1 and 1.
   Multiplying by change gives a value between -change and change, which is then added to the rate.
   """

return rate + change * (1 - random.random() * 2)

def main():

# Last year expense
while True:
   try:
         annual_spend = int(input("How much did you spend last year to support your current life style? "))
         if annual_spend >= 0:
            break
         else:
            print("Please enter a non-negative integer")
   except ValueError:
         print( "Please enter a non-negative integer")

# Inflation rate
while True:
   try:

Write a function named even_sum even_sum that prompts the user for...