Added workbook feature for xls support.

Other formats expected.

tablib/core.py

@@ -14,6 +14,8 @@ import os
 from helpers import *
 from packages import simplejson as json
 from packages import xlwt
+import random
+
 
 try:
     import yaml
@@ -205,7 +207,7 @@ class Dataset(object):
 
 class DataBook(object):
 	"""A book of Dataset objects.
-	   Currently, this exists only for excel workbook support.
+	   Currently, this exists only for XLS workbook support.
 	"""
 
 	def __init__(self):
@@ -219,11 +221,6 @@ class DataBook(object):
 		else:
 			raise InvalidDatasetType
 
-
-	def export(self):
-		pass
-
-
 	@property
 	def size(self):
 		"""The number of the Datasets within DataBook."""
@@ -232,7 +229,21 @@ class DataBook(object):
 
 	@property
 	def xls(self):
-		pass
+		"""Returns XLS representation of DataBook."""
+
+		stream = cStringIO.StringIO()
+		wb = xlwt.Workbook()
+
+		for dset in self._datasets:
+			ws = wb.add_sheet(dset.title if dset.title else 'Tabbed Dataset %s' % (int(random.random() * 100000000)))
+
+			#for row in self._package(dicts=False):
+			for i, row in enumerate(dset._package(dicts=False)):
+				for j, col in enumerate(row):
+					ws.write(i, j, col)
+
+		wb.save(stream)
+		return stream.getvalue()
 
 
 		

tablib/tests/tests.py

@@ -10,17 +10,40 @@ data = [
 
 data = tablib.Dataset(*data, headers=headers)
 
-#print data[1]
-data.append(['kenneth' ,'reitz', 4.3])
+data.append(['Kenneth' ,'Reitz', 4.3])
 
+#print '***WITH HEADERS***'
 
-#print data.digest()
+#print 'First Names:\n',
+#print data['first_name']
 
+#print '\nYAML:'
 #print data.yaml
+#
+#print 'JSON:'
 #print data.json
+#
+#print '\nCSV:'
+#print data.csv
+#
+#
+#print '***AND WITHOUT HEADERS***'
+#
+#data.headers = None
+#
+#print '\nYAML:'
+#print data.yaml
+#
+#print 'JSON:'
+#print data.json
+#
+#print '\nCSV:'
+#print data.csv
+
+book = tablib.DataBook()
+book.add_book(data)
+book.add_book(data)
+
+print book.xls
+
 
-data.headers = None
-print data.csv
-#print len(data.xls)
-print data.yaml
-print data.json