input: Write a function to generate and print a Pascal triangle for a given number of rows. The function should take one argument, the number of rows, and print the Pascal triangle with proper formatting.
  
  def PascalTriangle(n):
      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()
  
  assert PascalTriangle(5)==None
  assert PascalTriangle(3)==None
output: def PascalTriangle(n):
      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()