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Snapshot from lesson 1
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‎Work/bounce.py‎

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# bounce.py
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#
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# Exercise 1.5
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# A rubber ball is dropped from a height of 100m and each time it hits the ground, it bounces
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# back to 3/5 the height it fell.
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# Print a table showing the height of the first 10 bounces.
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height = 100
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for i in range(10):
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height = height * 3 / 5
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print(i+1, round(height, ndigits=4))

‎Work/hello.py‎

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print('hello world!')

‎Work/mortgage.py‎

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# mortgage.py
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#
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# Exercise 1.7
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# Dave has decided to take out a 30 years mortgage of $500,000.
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# The interest rate is 5%, the monthly payment is $2684.11
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# Calculate the total amount that Dave will have to pay over the
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# life of the mortgage
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# Suppose Dave has an extra payment of $1000/month for the first 12 months
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# of the mortgage.
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principal = 500000.0
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rate = 0.05
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payment = 2684.11
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total_paid = 0
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number_months = 0
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while principal > 0:
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principal = principal * (1+rate/12) - payment
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total_paid = total_paid + payment
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if number_months < 12:
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total_paid = total_paid + 1000
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principal = principal - 1000
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number_months = number_months + 1
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print('Total paid', round(total_paid, ndigits=2))
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print('Number of Months', number_months)

‎Work/sears.py‎

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# On day one you deposit one bill on the ground in front of Sears tower.
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# Every day you go out and double the number of bills.
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# How many days will it take for the height of the bill stack to exceed the height of the tower?
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bill_thickness = 0.11 * 0.001 # meters
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sears_height = 442 # height in meters
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num_bills = 1
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day = 1
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while num_bills * bill_thickness < sears_height:
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print(day, num_bills, num_bills * bill_thickness)
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day = day + 1
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num_bills = num_bills * 2
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print('Number of days', day)
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print('Number of bills', num_bills)
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print('Final height', num_bills * bill_thickness)

‎Work/variable_mortgage.py‎

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# Dave has decided to take out a 30 years mortgage of $500,000.
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# The interest rate is 5%, the monthly payment is $2684.11
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# Calculate the total amount that Dave will have to pay over the
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# life of the mortgage
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# User input is used to set custom payments
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principal = 500000.0
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rate = 0.05
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payment = 2684.11
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total_paid = 0
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number_months = 0
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extra_payment_start_month = 1000000000
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extra_payment_end_month = extra_payment_start_month
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extra_payment = 0
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extra_payment = int(input('Extra payment / month: '))
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if extra_payment > 0:
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extra_payment_start_month = int(input('Extra payment start month: '))
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extra_payment_end_month = int(input('Extrapoayment end month: '))
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while principal > 0:
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principal = principal * (1+rate/12) - payment
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total_paid = total_paid + payment
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number_months = number_months + 1
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if number_months >= extra_payment_start_month and number_months <= extra_payment_end_month:
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total_paid = total_paid + extra_payment
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principal = principal - extra_payment
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print(number_months, round(total_paid, 2), round(principal, 2))
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print('Total paid', round(total_paid, ndigits=2))
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print('Number of Months', number_months)

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