input: from typing import List
  
  def PascalTriangle(n: int) -> None:
      """Generate and print Pascal's Triangle up to n rows.
      >>> PascalTriangle(5)
      1 
      1 1 
      1 2 1 
      1 3 3 1 
      1 4 6 4 1 
      """
      arr = [0 for i in range(n)]
      for line in range(0, n):
          for i in range(0, line + 1):
              if (i == 0 or i == line):
                  arr[i] = 1
              else:
                  arr[i] = arr[i] + arr[i - 1]
          for i in range(0, line + 1):
              print(arr[i], end=" ")
          print()
output:     arr = [0 for i in range(n)]
      for line in range(0, n):
          for i in range(0, line + 1):
              if (i == 0 or i == line):
                  arr[i] = 1
              else:
                  arr[i] = arr[i] + arr[i - 1]
          for i in range(0, line + 1):
              print(arr[i], end=" ")
          print()