I want to make a pascal triangle from python script. and this is my syntax that I get from web.programminghub.io
size = int(input("Enter the size of the triangle: "))
tri=[]
#creates a pascal triangle of size n
def pascal(n):
"""Prints out n rows of Pascal's triangle.
It returns False for failure and True for success."""
row = [1]
k = [0]
for x in range(max(n,0)):
tri.append(row)
row=[l+r for l,r in zip(row+k,k+row)]
return n>=1
#prints the pascal triangle with correct spacing to
#represent a triangle
def print_pascals_triangle(triangle):
largest_element = triangle[-1][len(triangle[-1]) // 2]
element_width = len(str(largest_element))
def format_row(row):
return ' '.join([str(element).center(element_width)
for element in row])
triangle_width = len(format_row(triangle[-1]))
for row in triangle:
print(format_row(row).center(triangle_width))
pascal(size)
print_pascals_triangle(tri)
the problem is, no explanation for every single of line from this script code. so can someone explain every line of this syntax meaning.
The first function pascal generates a pascal's triangle stored in tri. The print_pascals_triangle prints the triangle symmetrically.
Enter the size of the triangle: 3
1
1 1
1 2 1
pascal generates [[1], [1, 1], [1, 2, 1]].
print_pascals_triangle prints each row centered at a fixed width (triangle_width).
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