On Mon, Apr 8, 2013 at 8:07 PM, <bhk...@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__'
> --
> http://mail.python.org/mailman/listinfo/python-list
>
Not sure about the __trunc__ problem but i can suggest this alternative
which is a bit simpler
def array2D(x, y, val=None):
return [[val for col in xrange(x)] for row in xrange(y)]
--
"The UNIX system has a command, nice ... in order to be nice to the other
users. Nobody ever uses it." - Andrew S. Tanenbaum
--
http://mail.python.org/mailman/listinfo/python-list
