Can anyone please help me in resolving the error => AttributeError: Array instance has no attribute '__trunc__'
bhk755 at gmail.com
bhk755 at gmail.com
Tue Apr 9 00:01:04 EDT 2013
On Monday, April 8, 2013 3:37:38 PM UTC+5:30, bhk... at gmail.com wrote:
> 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__'
Hi Dylan,
Thank you for the alternative solution. I will look into that.
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