Working with commas in output

Question

I'm in an intro programming class and am lost. We've had several labs that required knowledge that we haven't been taught but I've managed to find out what I need on google (as nobody responds to the class message board) but this one has me pretty frustrated. I'll include a pastebin link here: https://pastebin.com/6JBD6NNA

`principal = input()
print('Enter the Principal Value of your investment: $', float(principal))

time = input()
print('\nEnter the Time(in years) you plan to save your investment: ', int(time))

rate = input()
print('\nEnter the Rate (2% = 0.02) you will collect on your investment: ', float(rate))


interest = (float(principal) * float(rate)) * int(time)
final_value = float(principal) + float(interest)
print('\nThe Final Value of your investment will be: $%.2f' % final_value)`

So I need the output of the dollar amounts to have a comma ($27,500.00) but I have no idea how to do this. I've seen a couple of solutions on this site and others but I can't get them to work. PLEASE can someone help me?

have you tried `"{:,}".format(value)` from https://stackoverflow.com/questions/1823058/how-to-print-number-with-commas-as-thousands-separators — deltatango, Sep 25 '17 at 18:08
Yes I couldn't get that to work; I'm only in my 4th week of the class so you all will have to bear with me. :P After examining the solutions below I see what I was doing wrong. Thanks everyone! — Brian Grubba, Sep 25 '17 at 18:31

score 2 · Answer 1 · answered Sep 25 '17 at 18:07

2

In Python 2.7 or above, you can use

print('The Final Value of your investment will be: ${:,.2f}'.format(final_value))

This is documented in PEP 378.

Source: Python Add Comma Into Number String

answered Sep 25 '17 at 18:07

Stuart Buckingham

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When I try that with my variable I get "SyntaxError: EOL while scanning string literal" – Brian Grubba Sep 25 '17 at 18:10
In your original question, you have the entire code block surrounded in back ticks (why?). Maybe you need to add them again. This works fine for me: `>>> print('The Final Value of your investment will be: ${:,.2f}'.format(23456789)) The Final Value of your investment will be: $23,456,789.00` – Stuart Buckingham Sep 25 '17 at 18:11
Not sure why those are there, they aren't in my original code. Perhaps when I turned it into a code block they were added. – Brian Grubba Sep 25 '17 at 18:29

score 1 · Answer 2 · answered Sep 25 '17 at 18:08

1

Your last line should be:

print ("\nThe Final Value of your investment will be: ${:,.2f}".format(final_value))

answered Sep 25 '17 at 18:08

Sara Fuerst

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so is the only difference the double quotation? Thank you that did work (I meant the only difference between your solution and the one from Stuart above) – Brian Grubba Sep 25 '17 at 18:12

score 1 · Accepted Answer · answered Sep 25 '17 at 18:15

1

Here is a working example:

principal = float(input('Enter the Principal Value of your investment: $'))

time = int(input('\nEnter the Time(in years) you plan to save your investment: '))

rate = float(input('\nEnter the Rate (2% = 0.02) you will collect on your investment: '))


interest = principal * rate * time
final_value = principal + interest
print('The Final Value of your investment will be: ${:,.2f}'.format(final_value))

answered Sep 25 '17 at 18:15

Kyle Higginson

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I struggle with syntax in assigning variables via input, your answer helped a lot with that too. Thanks! – Brian Grubba Sep 25 '17 at 18:29

Working with commas in output

3 Answers3