added docu and formatting of comment

saqc/core/core.py

@@ -220,6 +220,18 @@ class SaQC(FuncModules):
         return data.to_df(), self._translator.backward(flags)
 
     def _wrap(self, func: Callable):
+        """ Enrich a function by special saqc-functionality.
+
+        For each saqc function this realize
+            - the source-target workflow,
+            - regex's in field,
+            - translation of ``flag`` and
+            - working inplace.
+        Therefore it adds the following keywords to each saqc function:
+        ``target``, ``regex`` and ``inplace``.
+
+        The returned function returns a Saqc object.
+        """
         def inner(
             field: str,
             *args,
@@ -233,6 +245,8 @@ class SaQC(FuncModules):
             if regex and target is not None:
                 raise ValueError("explicit `target` not supported with `regex=True`")
 
+            # kwargs['flag'] = self._translator(flag)
+            # kwargs.setdefault('to_mask', self._translator.TO_MASK)
             kwargs = {
                 "flag": self._translator(flag),
                 "to_mask": self._translator.TO_MASK,