add doc for unit

docs/index.rst

@@ -36,3 +36,4 @@ Content
    request
    set
    string
+   unit

docs/unit.rst

@@ -0,0 +1,15 @@
+Unit
+----
+
+.. py:class:: pydu.unit.Bytes(bytes)
+
+    Supply several methods dealing with bytes.
+
+    .. py:method:: convert(self, unit=None, multiple=1024)
+
+        Convert bytes in give ``unit``.
+        If ``unit`` is None, convert bytes in suitable unit.
+        Convert ``multiple`` is default to be 1024.
+
+        >>> Bytes(1024).convert()
+        (1, 'KB')

pydu/unit.py

@@ -12,7 +12,7 @@ class Bytes(object):
 
     def convert(self, unit=None, multiple=1024):
         """
-        Convert bytes in give unit.
+        Convert bytes in give ``unit``.
         If `unit` is None, convert bytes in suitable unit.
         Convert `multiple` is default to be 1024.
         """