Minor cleanups

src/libprs500/__init__.py

@@ -36,6 +36,6 @@ the following rule in C{/etc/udev/rules.d/90-local.rules} ::
 You may have to adjust the GROUP and the location of the rules file to 
 suit your distribution.
 """
-__version__   = "0.3.3"
+__version__   = "0.3.4"
 __docformat__ = "epytext"
 __author__    = "Kovid Goyal <kovid@kovidgoyal.net>"

src/libprs500/books.py

@@ -93,12 +93,10 @@ class Book(object):
         self.prefix = prefix
         self.root = root
     
-    def __repr__(self):        
+    def __str__(self):
+        """ Return a utf-8 encoded string with title author and path information """
         return self.title.encode('utf-8') + " by " + \
                self.author.encode('utf-8') + " at " + self.path.encode('utf-8')
-    
-    def __str__(self):
-        return self.__repr__()
 
 
 def fix_ids(media, cache):

src/libprs500/communicate.py

@@ -235,8 +235,7 @@ class PRS500Device(Device):
             self.handle = self.device.open()
             self.handle.claim_interface(self.INTERFACE_ID)
         except USBError, err:
-            print >> sys.stderr, err
+            raise DeviceBusy(str(err))
-            raise DeviceBusy()
         # Large timeout as device may still be initializing
         res = self.send_validated_command(GetUSBProtocolVersion(), timeout=20000) 
         if res.code != 0: 

src/libprs500/errors.py

@@ -38,8 +38,9 @@ class DeviceError(ProtocolError):
 
 class DeviceBusy(ProtocolError):
     """ Raised when device is busy """
-    def __init__(self):
+    def __init__(self, uerr=""):
-        ProtocolError.__init__(self, "Device is in use by another application")
+        ProtocolError.__init__(self, "Device is in use by another application:"\
+                               "\nUnderlying error:" + str(uerr))
 
 class PacketError(ProtocolError):
     """ Errors with creating/interpreting packets """