Can anyone please help me in resolving the error => AttributeError: Array instance has no attribute '__trunc__'

[bhk755 at gmail.com]

I am trying to create 2D arrays without using advanced features like numpy, for this I have created 2 separate modules arrays.py and array2D.py. Here's the code for that:

arrays.py module:
==================
import ctypes

class Array:

#Creates an array with size elements.
    def __init__( self, size ):
        assert size > 0, "Array size must be > 0"
	self._size = size
	print "sixe is %s" %self._size
		
 # Create the array structure using the ctypes module.
	PyArrayType = ctypes.c_int * size
	self._elements = PyArrayType()
	print "type is e", type(self._elements)
	#self._elements = ctypes.c_int * size
	
	print "Elements are self.element %s" % self._elements
# Initialize each element.
	#for i in range(self._size):
	#	self.clear( i )
			
				
# Returns the size of the array.
    def __len__( self ):
        return self._size

# Gets the contents of the index element.
    def __getitem__( self, index ):
        assert index >= 0 and index < len(self), "Array subscript out of range"
	return self._elements[ index ]

# Puts the value in the array element at index position.
    def __setitem__( self, index, value ):
        assert index >= 0 and index < len(self), "Array subscript out of range"
	print "Type is ", type(index)
	self._elements[ index ] = value

# Clears the array by setting each element to the given value.
    def clear( self, value ):
        for i in range( len(self) ) :
	self._elements[i] = value

# Printing the arrays:
    def __str__(self):
        return self._elements

			
			
array2D.py module
==================

		
import arrays

class Array2D :
    # Creates a 2-D array of size numRows x numCols.
    def __init__( self, numRows, numCols ):
    # Create a 1-D array to store an array reference for each row.
		
        self._theRows = arrays.Array( numRows )
	# Create the 1-D arrays for each row of the 2-D array.
	print "Num of Cloumns is", numCols
		
	for i in range( numRows ) :
	    self._theRows[i] = arrays.Array( numCols )

    # Returns the number of rows in the 2-D array.
    def numRows( self ):
        return len( self._theRows )

    # Returns the number of columns in the 2-D array.
    def numCols( self ):
        return len( self._theRows[0] )

    # Clears the array by setting every element to the given value.
    def clear( self, value ):
        for row in range( self.numRows() ):
            row.clear( value )

    # Gets the contents of the element at position [i, j]
    def __getitem__( self, ndxTuple ):
        assert len(ndxTuple) == 2, "Invalid number of array subscripts."
        row = ndxTuple[0]
        col = ndxTuple[1]
        assert row >= 0 and row < self.numRows() \
            and col >= 0 and col < self.numCols(), \
                "Array subscript out of range."
        the1dArray = self._theRows[row]
        return the1dArray[col]

    # Sets the contents of the element at position [i,j] to value.
    def __setitem__( self, ndxTuple, value ):
        #assert len(ndxTuple) == 3, "Invalid number of array subscripts."
        row = ndxTuple[0]
        col = ndxTuple[1]
        assert row >= 0 and row < self.numRows() \
            and col >= 0 and col < self.numCols(), \
                "Array subscript out of range."
        the1dArray = self._theRows[row]
        the1dArray[col] = value
		
		
arr = Array2D(2,4)

print "arr is %s" %arr


Traceback is :

sixe is 2
type is e <class 'arrays.c_long_Array_2'>
Elements are self.element <arrays.c_long_Array_2 object at 0x00AA7F80>
Cols in 4
Num of Cloumns is 4
!!!!!!!!!!!!!! i is 0
sixe is 4
type is e <class 'arrays.c_long_Array_4'>
Elements are self.element <arrays.c_long_Array_4 object at 0x00B60210>
Type is  <type 'int'>
Traceback (most recent call last):
  File "C:\Python27\Lib\array2D.py", line 53, in <module>
    arr = Array2D(2,4)
  File "C:\Python27\Lib\array2D.py", line 16, in __init__
    self._theRows[i] = arrays.Array( numCols )
  File "C:\Python27\Lib\arrays.py", line 36, in __setitem__
    self._elements[ index ] = value
AttributeError: Array instance has no attribute '__trunc__'