- will work like stack.append(stack.pop()-stack.pop())) 
ASCII Art Turtle
As you know, the LOGO programming language allows you to manoeuvre a turtle and draw lines in a graphical way. It occurs to me that we can do this for ascii-art.
A minimal set of commands to produce ascii-art would be the R(otate right), F(orward) and P(en) commands. For exampl...
I see lot of examples of generator functions, but I want to know how to write generators for classes. Lets say, I wanted to write Fibonacci series as a class.
class Fib:
def __init__(self):
self.a, self.b = 0, 1
def __next__(self):
yield self.a
self.a, self.b = ...
This math problem was posted on The Nineteenth Byte over at Programming Puzzles and Code Golf.
It states this: Prove that for all [integers] $n > 0, 2^n$ will contain a digit other than $1$ and $0$ in base $5$.
TNB came up with these conditions for a counterexample:
$2^n \text{ mod } 5 = 1$ ; ...
We assume it can be written as $N=5^{a_n}+5^{a_n-1}+・・・+5^{a_1}+1$
Since this equal to $2^n$. Let $n=4m$,
$2^{n}-1$
$=16^{m}-1$
$=(3*5+1)^m-1 $
$=(3*5)^m+・・・+m(m-1)/2*(3*5)^2+5*3m$
It must be $3m=5^{b_1}=1$, or $5^{b_1}+1$. $9m(m-1)/2$ must be $5^{b_2},5^{b_2}+1$. So possible case are two.
...
Ninjas in a Chat Log
code-golf (other tags?)
Often in chat, someone will ask a question, and multiple people will answer it at the same time. Usually, the person who was beaten to the gun will say "ninja'd", creating even more unnecessary chat.
Given a chat log similar to the following:
Commu...
0
Challenge
Given a string, make it into a triangle as shown below:
Input
Hello, world!
Output
H
He
Hel
Hell
Hello
Hello,
Hello,
Hello, w
Hello, wo
Hello, wo
Hello, wor
Hello, worl
Hello, world
Hello, world!
The first line contains the first character of the string. The following lines con...
0
Lorum Ipsum is placeholder text used when preparing layout without wanted to have content already filled.
One of it's key features over using some arbitrary text is that it is nonsense.
It isn't even valid latin (though it is close).
This prevents anyone being shown the layout from becoming dist...
0
Make me some ASCII cities!
Your job is to pseudo randomly generate ASCII cities (top down view) with n building per row with x rows. Each house should have a number label starting with 000 and working up. First number is the row (assume x<9) and the other two are places in the row. i.e 000, 001,...
