#  ArrayDemoEfficient.py  (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-14  File created.
#  2022-12-27  Converted to Python 3.

#  This program works like ArrayDemo.py. This one uses the
#  array type specified in module array.

#  Objects of type array.array can be indexed in the same way 
#  as lists. array.arrays can contain only numerical values.

import array  #  A module which specifies efficient numerical arrays

integer_index  =  0

array_of_integers  =  array.array( 'i' )  #  create an array of type int

array_of_integers.append( 333 ) 
array_of_integers.append( 33 ) 
array_of_integers.append( 3 )
array_of_integers.append( array_of_integers[ 2 ]  +  2 )

for integer_index  in  range( 4, 50 ) :

   array_of_integers.append(  \
                 array_of_integers[ integer_index - 1 ]  +  2 )


print( "\n The contents of \"array_of_integers\" is:" )

for integer_index  in  range( 50 ) :

   if ( ( integer_index  %  10 )  ==  0  ) :
      
      print( "" )   #  This prints an empty line.

   print( "%5d"  %  array_of_integers[ integer_index ], end="" )


print(  "\n\n The typecode of the array is "  +  array_of_integers.typecode )