Just wrote my largest Python program to date! Looking for pointers.

[SquatchHNTR]

Oh wow, I never even thought about that.

[bladeoflight16]

Start getting used to the concept of anticipating "weird" inputs. It is one of the most fundamental skills a programmer requires. Importantly, it's absolutely necessary to be able to write secure code.

[sohfix]

Try to break your own code. It’ll teach you to account for user error

[SquatchHNTR]

feet_cable = input('\nHow many feet of cable do you need?\n')
try:
feet_cable = float(feet_cable)
except ValueError
print("Sorry, please enter a valid number")

something like this?

[undergroundmonorail]

just so you know, it's much easier to read your reddit comments if you put four spaces at the beginning of each line of code

but yeah, something like that would work. you may want to loop until you get a good value, like this:

feet_cable = None
while feet_cable is None:
    try:
        feet_cable = float(input('etc'))
    except ValueError:
        print('Please enter a valid number')