fix #2: ValueError: More than 4094 XFs (styles) # when writing to xls : reference: http://stackoverflow.com/questions/17130516/xlwt-set-style-making-error-more-than-4094-xfs-styles

pyexcel_xls/__init__.py

@@ -201,7 +201,7 @@ class XLWriter(BookWriter):
     def __init__(self, file, **keywords):
         """Initialize a xlwt work book"""
         BookWriter.__init__(self, file, **keywords)
-        self.wb = Workbook()
+        self.wb = Workbook(style_compression=2)
 
     def create_sheet(self, name):
         """Create a xlwt writer"""

tests/test_bug_fixes.py

@@ -6,7 +6,8 @@
 
 import os
 import pyexcel as pe
-import pyexcel.ext.xls
+import pyexcel.ext.xls as xls
+from pyexcel_io import OrderedDict
 import datetime
 
 
@@ -20,4 +21,11 @@ class TestBugFix:
                                  "test-fixtures",
                                  "test-date-format.xls"))
         assert s[0,0] == datetime.datetime(2015, 11, 11, 11, 12, 0)
-        
+
+    def test_pyexcel_xls_issue_2(self):
+        data = OrderedDict()
+        array = []
+        for i in xrange(4100):
+            array.append([datetime.datetime.now()])
+        data.update({"test": array})
+        s = xls.save_data("test.xls", data)