[Tutor] Fwd: im having problems and need help
Leam Hall
leamhall at gmail.com
Wed Sep 20 15:15:41 EDT 2023
Hey Robert, no worries!
If I am using whole numbers for division, like 3, and 20, then:
20 divided by 3 gives 6.
3 times 6 is 18, and if I am dividing into 20, there is 2 left over.
So, 20 % 3 is 2, since there is 2 left over.
When you say:
if number % 2 == 0:
You have already proven that the number is even.
Does that help?
Leam
-------- Forwarded Message --------
Subject: Re: [Tutor] im having problems and need help
Date: Wed, 20 Sep 2023 12:03:12 -0700
From: Robert Towne <townerobert1 at gmail.com>
To: Leam Hall <leamhall at gmail.com>
I'm lost on the modelo. % it's a reminder? I don't understand it. I ran it in print(number%2). No matter what the number was it would come out to 1 or 0. I'm thinking the % is like a pre program. If it's even or odd. I'm not sure. Though. I'm stuck.
I can run a while loop. But I'm lost at this modulo %.
On Wed, Sep 20, 2023, 4:48 AM Leam Hall <leamhall at gmail.com <mailto:leamhall at gmail.com>> wrote:
Robert,
Sorry, your mail program killed the code indents. Also, "%" is the modulus/modulo operator, not the power.
>>> 20 % 2
0
So, the while line:
number % 2 == 0
Returns True if number is even. It says "If number / 2 leaves no remainder". Compare that to:
>>> 20 % 3
2
Which says "20 / 3 leaves a remainder of 2".
Hope that helps.
Leam
On 9/15/23 15:07, Robert Towne wrote:
> Im having problems understanding this. Im running the while loop like it
> says; and it doesnt complete the loop.
> My question is, is it the formula thats wrong or my math. The % sign means
> to square the number?
> since i the to the second power is 64. Then it should return false. IDK
> what I am doing wrong, if you could
> help me understand where I am going wrong i would appreciate it thank you.
>
> def is_power_of_two(number):
> # This while loop checks if the "number" can be divided by two
> # without leaving a remainder. How can you change the while loop to
> # avoid a Python ZeroDivisionError?
> while number % 2 == 0:
> number = number / 2
> # If after dividing by 2 "number" equals 1, then "number" is a power
> # of 2.
> if number == 1:
> return True
> return False
>
> # Calls to the function
> print(is_power_of_two(0)) # Should be False
> print(is_power_of_two(1)) # Should be True
> print(is_power_of_two(8)) # Should be True
> print(is_power_of_two(9)) # Should be False
> _______________________________________________
> Tutor maillist - Tutor at python.org <mailto:Tutor at python.org>
> To unsubscribe or change subscription options:
> https://mail.python.org/mailman/listinfo/tutor <https://mail.python.org/mailman/listinfo/tutor>
--
Software Engineer (reuel.net/resume <http://reuel.net/resume>)
Scribe: The Domici War (domiciwar.net <http://domiciwar.net>)
General Ne'er-do-well (github.com/LeamHall <http://github.com/LeamHall>)
_______________________________________________
Tutor maillist - Tutor at python.org <mailto:Tutor at python.org>
To unsubscribe or change subscription options:
https://mail.python.org/mailman/listinfo/tutor <https://mail.python.org/mailman/listinfo/tutor>
--
Software Engineer (reuel.net/resume)
Scribe: The Domici War (domiciwar.net)
General Ne'er-do-well (github.com/LeamHall)
More information about the Tutor
mailing list