Allow Python App To Continue Running Until User Ends

Question

I\'m pretty new to python and I wrote a simple blackjack card counting app. The app runs and after the user input it ends, I want it to continue asking for the user input and pr

Answer 1

To make your program run until the user stops providing input, you will probably need to put your code in a loop. A while loop is usually the best when you don't know ahead of time how long you'll need to loop for.

count = 0
while True: # runs forever
    var = int(raw_input("Enter the value of the card: "))

    # if/elif block goes here

Once you do this though, you'll find that there's a logic error in your code. Currently you're printing count + 1 or similar in one of your if/elif blocks each time. However, this doesn't modify the value of count, it just prints the new value directly. What I think you'll want to do is change your code to directly modify count in the if/else blocks, then write it out in a separate step. You can also combine several of your conditions using < or >, like this:

    if var < 7:
        count += 1
    elif var > 9:
        count -= 1

    print count

You could optionally add some extra error checking to make sure the entered value is appropriate (e.g. between 1 and 11), but I've left that off here for clarity.