on this page https://github.com/dabeaz-course/practical-python/blob/master/Notes/01_Introduction/00_Overview.md

the first link https://github.com/dabeaz-course/practical-python/blob/master/Notes/01_Introduction/01_Python is giving 404

From the description it is not clear if the extra payment start and/or end month should be included in the range. The exercise asks for "4 years starting in year 5", the code shows an exclusive range [60, 108], but the solution uses an inclusive range with ">=" and "<=" which results in 49 months.

I tried to solve the Mortgage Exercise.

principal = 500000.0
rate = 0.05
payment = 2684.11
total_paid = 0.0
extra_payment_start_month = 61
extra_payment_end_month = 108
extra_payment = 1000
month = 0

while principal > 0:
    month = month + 1
    if month >= extra_payment_start_month and month <= extra_payment_end_month:
        principal = principal * (1 + rate / 12) - payment - extra_payment
        total_paid = total_paid + payment + extra_payment
    else:
        principal = principal * (1 + rate / 12) - payment
        total_paid = total_paid + payment
    if principal < 0:
        total_paid = total_paid+principal
        principal = 0
    print(month,total_paid,principal)

print('Total paid',total_paid)
print('Month', month)

However. I get different numbers. Not only for the corrected payment and principal at the end....even before.

I honestly cannot find an error in my code?! Any advise or hint?

Warning: It is never possible to paste more than one Python command (statements that appear after >>>) to the basic Python shell at a time. You have to paste each command one at a time.

This is false, at least on FreeBSD with xfce4-terminal. I've been using Python for 6 years and can't remember this ever being true.

going back to the content to navigate between chapters is a bit tedious. It would be nice to have a "next" link somewhere to progress through the chapters.

There are three links in the 3.2 More on Functions page, which when clicked go to 404 not found. I have not checked any other pages (yet...).

Argument Passing When you call a function, the argument variables are names that refer to the passed values. These values are NOT copies (see section 2.7).

An example of a column selector was given in Exercise 2.23. However, here’s one way to do it:

You already explored this in Exercise 2.24. You'll need to insert the following fragment of code into your solution:

Hi, so I am trying to follow this course. I have anaconda 3 installed (using python 3.8.3) and git bash.

So to start the python interpreter on git bash, I typed: winpty python which worked fine.

When I tried to execute a file, hello.py file for example, I would type: python hello.py it only works if the file is located C:\Users\username

I am now working on 1.2 A First Program. In the exercise for the bouncing ball, the file required is stored here: C:\Users\username\GitHub Projects\practical-python\Work #bounce.py

But because the file #bounce.py is located in a subfolder, I can't execute the script by typing: python bounce.py

I am rather new to working in a terminal and unclear about environment variables and paths, what should I do in this situation? I want to be able to get the same output in git bash as shown on the course page.

Why can't I get my loop to run like the example? I have been messing with it for a while. I have the right answer but mine looks different lol. Specifically my extra_payment_start_month is set to 60. `

mortgage.py

Exercise 1.7

m = 500000.00 i = 0.05 p = 2684.11 t = 0.00 month = 0

extra_payment_start_month = 60 extra_payment_end_month = 108 extra_payment = 1000

while m > 0: if (month >= extra_payment_start_month) and (month < extra_payment_end_month): m = m * (1+i/12) - p - extra_payment t = t + p + extra_payment month += 1 print('BONUS','month:', month, 'paid:', round(t,2), "Remaining principle:", round(m,2)) continue if m <= p: t += m m = 0 month += 1 print("LAST", 'month:', month, 'paid:', round(t,2), "Remaining principle:", round(m,2)) break m = m * (1+i/12) - p t = t + p month += 1

print("OUTER", 'month:', month, 'paid:', round(t,2), "Remaining principle:", round(m,2))

`

This PR makes example of list construction when reading from a file executable.

There is also an issue with "Dict Construction" from file example. It gives an error because 'Data/prices.csv' file has an empty last row. I'd make a change to account for that but not sure if this clutters example clarity too much:

prices = {} # Initial empty dict

with open('Data/prices.csv', 'rt') as f:
    for line in f:
        row = line.split(',')
        if len(row) >= 2: # Ensure enough data in a row
            prices[row[0]] = float(row[1])

If this change is desirable, I'll update this PR.

"Sometimes the () are ommitted in the syntax." https://dabeaz-course.github.io/practical-python/Notes/02_Working_with_data/01_Datatypes.html

# mortgage.py

principal = 500000.0
rate = 0.05
payment = 2684.11
total_paid = 0.0

while principal > 0:
    principal = principal * (1+rate/12) - payment
    total_paid = total_paid + payment

print('Total paid', total_paid)

Enter this program and run it. I get an answer of 966279.5999999957. Not 966,279.6.

I can get an anwer of 966,279.6 by following:

# Exercise 1.7


principal = 500000.0
rate = 0.05
payment = 2684.11
total_paid = 0.0

while principal > 0:
    principal = principal * (1+rate/12) - payment
    total_paid = total_paid + payment

print('Total paid', round(total_paid, 1))

Thanks a lot for making this course!!!

It looks like something has changed on the bus tracker website and the example code gets an http return code 404. It seems like the URL should be updated to make the exercise work.