Print a clean Pascal's triangle without list artifacts

[learnwithallen]

Summary

Revises the uploaded triangle.py so it prints a proper Pascal's triangle instead of raw Python lists.

Problem

The original script stored each row as a zero-padded list and left the output as raw lists, so results showed brackets, commas, and padding zeros (e.g. [0, 1, 0]) rather than a readable triangle.

Changes

• pascals_triangle(num_rows) builds the triangle cleanly, with each interior value being the sum of the two values above it — no zero padding.
• print_triangle(...) renders each row as space-separated numbers, centered, with no brackets, commas, or padding zeros.

Example output (n = 5)

    1
   1 1
  1 2 1
 1 3 3 1
1 4 6 4 1