Python in Practice

Here are some exercises that I was working on this week:

Bug 1

I am building some very high quality chairs and need exactly four nails for each chair. I've written a program to calculate how many nails I need to buy to build these chairs but something is wrong.

chairs = '15'
nails = 4
total_nails = chairs * nails
message = 'I need to buy {} nails'.format(total_nails)
print('You need to buy {} nails'.format(message))

When I run the program it tells me that I need to buy 15151515 nails.

How do I fix it?
To correct the code, I need to change the variable; chairs, from a string into an integer. In order for me to do that, I need to remove the apostrophes on the value 15.
once this is done, the program will run correctly and tell me that I need to buy 60 nails.

Bug 2

I'm trying to run this program, but I get an error.

my_name = Penelope
my_age = 29
message = 'My name is {} and I am {} years old'.format(my_name, my_age)
print(message)

How do I fix it?
To correct the code, I need to make Penelope a string:
my_name = 'Penelope'

python hasn't recognised the data type that the value Penelope is and isn't sure how to proceed. Once we specify that this is a string using '' it will run as instructed.

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Program 3

I have a lot of boxes of eggs in my fridge and I want to calculate how many omelettes I can make. each box of eggs contains six eggs and I need four eggs for each omelette.

number_of_eggs_for_omlette = 4
number_of_eggs_in_carton = 6
number_of_egg_cartons = 9
total_eggs = number_of_egg_cartons * number_of_eggs_in_carton
omlettes = total_eggs // number_of_eggs_for_omlette
left_over_eggs = total_eggs % number_of_eggs_for_omlette
message1 = 'there are {} eggs in total, this means you can make {} omlettes with {} eggs left over '.format(total_eggs, omlettes, left_over_eggs)
print(message1.format(message1))

There are 54 eggs in total, this means you can make 13 omlettes with 2 eggs left over

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I also want write a program to tell me how many eggs I need to buy to make x amount of eggs. For example, I want to make 25 omlettes, how many eggs do I need to buy??

number_of_eggs_for_omlette = 4
number_of_desired_omlettes = 25
number_of_eggs_in_carton = 6
total_eggs_needed = number_of_eggs_for_omlette * number_of_desired_omlettes
egg_cartons = total_eggs_needed // number_of_eggs_in_carton
message2 = 'to make {} omlettes, you will need {} eggs. That means you need to buy {} cartons of eggs' .format(number_of_desired_omlettes, total_eggs_needed, egg_cartons)
print(message2.format(message2))

To make 25 omlettes, you will need 100 eggs. That means you need to buy 16 cartons of eggs

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These programmes will print the information that I need, depending on the values i'm inputting into it.

Comments

[Scott Reno]

First of all, you should switch to "f-strings" for printing. They're MUCH easier to work with. realpython.com/python-f-strings/

[Lisa Ghosn]

Ooo very cool. Thank you for sharing @sreno77
I may redo these using f-strings, it makes a lot of sense to condense the code

[mohammadparsa-javidi]

Perfect 👍👍👌👌

[Lisa Ghosn]

it is now! I've incorporated f-strings 👌🏽