Add sort for string and test case

pydu/string.py

@@ -132,3 +132,14 @@ def common_suffix(l):
         commons.append(common)
     return ''.join(reversed(commons))
 
+
+def sort(string, reverse=False):
+    l = list(string)
+    l.sort(reverse=reverse)
+    return "".join(l)
+
+
+def
+
+
+

tests/test_string.py

@@ -1,6 +1,6 @@
 # coding: utf-8
 from pydu.string import (safeencode, safeunicode, strips, lstrips, rstrips,
-                         common_prefix, common_suffix)
+                         common_prefix, common_suffix,sort)
 
 
 def test_safeencode():
@@ -48,3 +48,13 @@ def test_common_prefix():
 def test_common_suffix():
     l = ['dabc', '1abc']
     assert common_suffix(l) == 'abc'
+
+
+def test_sort():
+    assert sort('abc21') == '12abc'
+    assert sort('abc21',reversed=True) == 'cba21'
+
+
+
+
+