input: 
  def PascalTriangle(n):
      """
      Generate and print a Pascal triangle with the given number of rows.
      
      >>> PascalTriangle(5)
      1 
      1 1 
      1 2 1 
      1 3 3 1 
      1 4 6 4 1 
      """
        
      # An auxiliary array to store 
      # generated Pascal triangle values 
      arr = [0 for i in range(n)] 
        
      # Iterate through every line and 
      # print integer(s) in it 
      for line in range(0, n) : 
            
          # Every line has number of  
          # integers equal to line  
          # number 
          for i in range (0, line + 1) : 
                
              # First and last values  
              # in every row are 1 
              if (i == 0 or i == line) : 
                  arr[i] = 1
                    
              # Other values are sum of  
              # values just above and  
              # left of above 
              else : 
                  arr[i] = arr[i] + arr[i - 1]  
                
          # Printing array in 
          # mantainence of order          
          for i in range (0, line + 1) : 
              print(arr[i], end =" ")  
          print()   
    
  # Driver Code 
  n = 5
  PascalTriangle(n)
  
output:     arr = [0 for i in range(n)] 
        
      # Iterate through every line and 
      # print integer(s) in it 
      for line in range(0, n) : 
            
          # Every line has number of  
          # integers equal to line  
          # number 
          for i in range (0, line + 1) : 
                
              # First and last values  
              # in every row are 1 
              if (i == 0 or i == line) : 
                  arr[i] = 1
                    
              # Other values are sum of  
              # values just above and  
              # left of above 
              else : 
                  arr[i] = arr[i] + arr[i - 1]  
                
          # Printing array in 
          # mantainence of order          
          for i in range (0, line + 1) : 
              print(arr[i], end =" ")  
          print()   
    
  # Driver Code 
  n = 5
  PascalTriangle(n)