Fix some broken error messages

px/px_install.py

@@ -30,22 +30,22 @@ def _install(src, dest):
         return
 
     if not os.path.isfile(src):
-        raise IOError("Source is not a file: %s" % src)
+        raise IOError("Source is not a file: %s" % (src,))
 
     parent = os.path.dirname(dest)
     if not os.path.isdir(parent):
-        raise IOError("Destination parent is not a directory: %s" % parent)
+        raise IOError("Destination parent is not a directory: %s" % (parent,))
 
     if os.path.isdir(dest):
-        raise IOError("Destination is a directory, won't replace that: %s" % dest)
+        raise IOError("Destination is a directory, won't replace that: %s" % (dest,))
 
     # Make sure nothing's in the way
     try:
         os.remove(dest)
     except OSError:
         pass
     if os.path.exists(dest):
-        raise IOError("Can't remove existing entry: %s" % dest)
+        raise IOError("Can't remove existing entry: %s" % (dest,))
 
     shutil.copyfile(src, dest)
     os.chmod(dest, 0o755)

px/px_load_bar.py

@@ -26,10 +26,10 @@ class PxLoadBar(object):
 
     def __init__(self, physical=None, logical=None):
         if physical is None or physical < 1:
-            raise ValueError("Physical must be a positive integer")
+            raise ValueError("Physical must be a positive integer, was: %r" % (physical,))
 
         if logical is None or logical < physical:
-            raise ValueError("Logical must be a positive integer >= physical (%r)" % physical)
+            raise ValueError("Logical must be an integer >= physical, was: %r" % (logical,))
 
         self._physical = physical
         self._logical = logical