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Python Python Basics (2015) Letter Game App Even or Odd Loop

or porat
or porat
684 Points
Posted by or porat
or porat
684 Points

Even_odd problem

Hey! I tried to check when even_odd is even, Did i make it right? second thing, i used '.format()' to fill the hole of the random number but what should i write inside the '.format()' ? third thing, why to decrement 'start' by -1?

and if my code should look different ill be glad to get some help! thanx and happy new year!

even.py 
import random

start = 5

while:
    random.randint(1,99)
    if even_odd = % 2
        print("{} is even".format(random.randint))
    else:
        print("{} is odd".format(random.randint))
        start -1
    is start = False:
        break


def even_odd(num):
    # If % 2 is 0, the number is even.
    # Since 0 is falsey, we have to invert it with not.
    return not num % 2
Jason Stanley
Jason Stanley
5,556 Points

I would encourage you to use the workspace provided if you are continually failing on one of the challenges. I had difficulty on this one earlier today.

The challenge asks you to use the even_odd function. You are not using it here. In python function definitions need to be at the top of the file. For example the following is incorrect.

test(123)

def test(number):
  print(number)

The above code will error because the test function is not defined when it is being called. However, the following code will work.

def test(number):
  print(number)

test(123)

Starting at the top of what you have done. Put the even_odd function at the top of the file.

You then want to assign the value of the random.randint() call to a variable.

random_number = random.randint(1,99)

Once you have done this, in your while loop, you can check to see if the number is even.

if even_odd(random_number):

Your messages can then be printed with your variable.

print("{} is even".format(random_number))

In your code you have written: start -1. All this is doing is assigning the value of start - 1 to nothing. Instead you want to have.

start -= 1

This will reduce the start variable by 1 on each iteration of the loop.

Finally on line 12 you should have if. You wrote 'is'.

Once you put all of it together I would expect you to be able to pass the test. If not again, I encourage you fire up the work environment. Put your code in a file and then run the file. When you see what it is doing you will probably work out how to fix it.

1 Answer

Steven Parker
Steven Parker
231,269 Points
Steven Parker
Steven Parker
231,269 Points

In addition to Jason's advice, here's the answers to your questions:

I tried to check when even_odd is even, Did i make it right?
You have a few syntax errors, see Jason's comments for details

second ... what should i write inside the '.format()' ?
You should pass the variable where you store the random number to the format()

third thing, why to decrement 'start' by -1?
The start variable acts as a loop counter. You decrement it so the loop will stop after running 5 times.

And for that loop counter to work, you'll need to test the value of start in your while statement:

while start:

When the value of start reaches 0, it will be considered "falsey" and the loop will end.