input: Write a function to generate and print the Pascal triangle for a given number of rows. If the input is 0, print nothing. The function should return None.
  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()   
    
  n = 5
  PascalTriangle(n)
  assert PascalTriangle(5)==None
  assert PascalTriangle(0)==None
output: def PascalTriangle(n):
      if n == 0:
          return None
      
      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()