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POMaking a nested for loop (Python 3.x)
 

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  1. POMaking a nested for loop (Python 3.x)
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    <p>So what I am trying to do is make this "Triangle" in python with for loops:</p> <p><img src="https://www.mathsisfun.com/images/pascals-triangle-n-choose-k.gif" alt="Pascal"></p> <p>But with the text like so:</p> <pre><code>0|0 1|01 2|012 3|0123 4|01234 </code></pre> <p>What the output that I currently have is:</p> <pre><code>0|01234 1|01234 2|01234 3|01234 4|01234 </code></pre> <p>And here is the code for the output:</p> <pre><code>def pascal(n): answer = "" for rows in range(n): answer = str(rows) + "|" for col in range(n): answer = answer + str(col) print(answer) pascal(5) </code></pre> <p>My question is, how the heck do I make the ouput do this?(Im stumped as to what im supposed to do):</p> <pre><code>0|0 1|01 2|012 3|0123 4|01234 </code></pre> <p><br></p> <hr> <p>If anyone would like to see what the hell I was trying to accomplish, heres my solution</p> <p>Soooooooo, this blue triangle:</p> <p><img src="https://www.mathsisfun.com/images/pascals-triangle-n-choose-k.gif" alt="Pascal"></p> <p>turns into the pascal triangle, by "n choose k":</p> <p><img src="https://www.mathsisfun.com/data/images/binomial-n-choose-k.png" alt="formula"></p> <p>I was trying to figure out the for loops so I can have the basic setup done(which is the blue triangle), which you guys helped with :)</p> <p>So the code that I came up with to get the n choose k is this:</p> <pre><code>def factorial(n): answer = 1 for number in range(2, n+1): answer = answer * number return answer def pascal(n): answer = "" for rows in range(n): answer = "" for col in range(rows+1): answer = answer + str( int(factorial(rows) / (factorial(col)*factorial(rows-(col)))) ) print(answer) pascal(10) </code></pre> <p>The factorial() is the exclamation point in the n choose k formula and I made the rest of the formula with this code:</p> <pre><code>factorial(rows) / (factorial(col)*factorial(rows-(col))) </code></pre> <p>So any n that is greater than 0, makes a pascal triangle :)</p>
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    1. USJoshua Schmidt
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    1. COYour code is fine, you only need to change this line: `for col in range(n):`. Shouldn't loop all the way to `n`
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      1. POMaking a nested for loop (Python 3.x)
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    2. COActually, it should be `range(rows+1)`. But, the entire outer loop body can be replaced with: `print(rows, "|", *range(rows+1), sep="")`
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      1. USMike Housky
 

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