Can anyone explain this Python code by Infant Ray to me in steps.

Question

I want to make my own code that makes Pascal's triangle, but I don't know how to make it so I looked on SoloLearn to get some inspiration.
I found this code but I don't understand how it works.(Functions)

#function to create a pascal's triangle of size num
def pascalGen(num,r=[]):
for item in range(num):
length = len(r)
r = [1 if i == 0 or i == length else r[i-1]+r[i] for i in range(length+1)]
yield r

#function that draws the triangle
def draw_triangle(num):
pascal = list(pascalGen(num))
max = len(' '.join(map(str,pascal[-1])))
for p in pascal:
print(' '.join(map(str,p)).center(max)+'\n')

#enter the size of the triangle
draw_triangle(int(input()))

#feedback
j = (35*'*')
k="\nLet me know how you like the code\n"
l="\n\t And\n"
m="\t Leave\n"
n="\t An Upvote\n"
o="\t If You Like It ;)"
print(j,k,l,m,n,o)

Infant Ray created this code.

Answer 1

Tibi, you have finished 3/4 of Python tutorial, language-wise you should be able to analyze this yourself.

Probably the math of it is not so easy... but that's the challenge after all, isn't it?

Answer 2

Thanks for advice.

Answer 3

I analyzed and commented it in detail here
https://code.sololearn.com/c3S89HQvXUrv/#