Adjust docstring and drop no longer used wrapper

perfact/zodbsync/helpers.py

@@ -15,27 +15,16 @@ def __init__(self, data=None, **kw):
 
 
 def to_string(value, enc='utf-8'):
-    '''This method delivers bytes in python2 and unicode in python3.'''
+    """Convert input into a string"""
     if isinstance(value, str):
         return value
     if isinstance(value, bytes):
         return value.decode(enc)
     return str(value)
 
 
-def to_ustring(value, enc='utf-8'):
-    '''Convert any string (bytes or unicode) into unicode.
-    '''
-    if isinstance(value, str):
-        return value
-    if isinstance(value, bytes):
-        return value.decode(enc, 'ignore')
-
-    return to_ustring(str(value))
-
-
 def to_bytes(value, enc='utf-8'):
-    '''This method delivers bytes (encoded strings).'''
+    """Convert input to bytes (encoded strings)"""
     if isinstance(value, memoryview):
         return value.tobytes()
     if isinstance(value, bytes):

perfact/zodbsync/tests/test_helpers.py

@@ -36,12 +36,10 @@ def test_converters():
     """
     Several tests for to_* methods
     """
-    for value in ['test', b'test', u'test']:
+    for value in ['test', b'test']:
         assert helpers.to_bytes(value) == b'test'
         assert helpers.to_string(value) == 'test'
-        assert helpers.to_ustring(value) == u'test'
     assert helpers.to_string([1]) == '[1]'
-    assert helpers.to_ustring([1]) == u'[1]'
     assert helpers.to_bytes([1]) == b'[1]'
     assert helpers.to_bytes(memoryview(b'test')) == b'test'