input: Write a function to print a Pascal triangle with the given number of rows. If the given number of rows is 0, the function should print nothing.
  
  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(0) == 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()