Checking my basic understanding of coding - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: Python Coding (https://python-forum.io/forum-7.html) +--- Forum: Homework (https://python-forum.io/forum-9.html) +--- Thread: Checking my basic understanding of coding (/thread-15181.html) |
Checking my basic understanding of coding - dilans94 - Jan-07-2019 Need a little help I'm kind of new to python and trying to understand basics of python. Trying to show what I understand by looking at the following coding. Correct me if i'm wrong in here. The # comment is what I understand about each coding line written down # Create function get_float def get_float(pmp): # assigning values to ‘val’ val = float(0.0) # Creating while loop while True: try: # converting user input to float data type val = float(input(pmp)) # checking condition if val is negative if val < 0.0: print("Cannot accept negative values!") continue # Breaks us out of the loop break # Throw error except ValError: return 0.0 # returning current value of ‘val’ return val # Function to: creating function run def go(): # create an array called ‘rv’ rv = RecyclingMachine() # assigning values to variable ‘next_customer’ next_customer = True # Creating a Do-While loop while next_customer: # assign values to rv array vm.accept_product() # assign values to rv array vm.identify_product() # assign values to rv array vm.print_receipt() # Creating a Do-While loop while True: # Getting the input in strings answer = get_str("(N)ext customer, or (Q)uit?") # Converting input into uppercase answer = answer.upper() # checking value of answer using a condition if answer == "N": # Breaks us out of the loop break elif answer == "Q": # Quite the loop exit() else: # Display what’s inside print statement print("Invalid Response")Thanks for having a look! RE: Checking my basic understanding of coding - ichabod801 - Jan-07-2019 As far as I can tell, yes. But it's not clear what RecyclingMachine is or what vm is. I some problems with the way the code is written, and I would expect an error on line 17 (although it's clear this is not the complete code, and there may be some other code that prevents that error. I expect I would have a problem with that code too). RE: Checking my basic understanding of coding - stullis - Jan-07-2019 The comment on line 16 isn't correct. The code isn't throwing (or "raising" in Python) an error. It's catching and handling an error that has been raised. RE: Checking my basic understanding of coding - nilamo - Jan-07-2019 Line 48 doesn't break the loop, it's calling sys.exit() to end the program immediately. https://docs.python.org/3/library/sys.html#sys.exitPersonally, I think this function should be used very very rarely, if ever. I think of it as a big red flag that something extremely bad happened, and you don't know how to proceed. Libraries should never use it, only client code (imagine if your webbrowser just crashed for some minor issue). |