fix: flake8 for utils dir

src/diffpy/srfit/util/__init__.py

@@ -19,7 +19,7 @@
 
 
 def sortKeyForNumericString(s):
-    """\ Compute key for sorting strings according to their integer numeric
+    """Compute key for sorting strings according to their integer numeric
     value.
 
     Each string gets split to string and integer segments to create keys
@@ -45,6 +45,7 @@ def sortKeyForNumericString(s):
                for i, w in enumerate(rx.split(s)))
     return rv
 
+
 sortKeyForNumericString._rx = None
 
 # End of file

src/diffpy/srfit/util/nameutils.py

@@ -27,7 +27,8 @@ def isIdentifier(s):
 
     From http://code.activestate.com/recipes/413487/
     """
-    if reident.match(s) is None: return False
+    if reident.match(s) is None:
+        return False
     return True
 
 
@@ -38,7 +39,7 @@ def validateName(name):
     """
     # Check that the name is valid
     if not isIdentifier(name):
-        raise ValueError("Name '%s' is not a valid identifier"%name)
+        raise ValueError(f"Name {name} is not a valid identifier")
     return
 
 # End of file

src/diffpy/srfit/util/observable.py

@@ -21,56 +21,54 @@ class Observable(object):
     """Provide notification support for classes that maintain dynamic
     associations with multiple clients.
 
-    Observers, i.e. clients of the observable, register event handlers that will be invoked to
-    notify them whenever something interesting happens to the observable. The nature of what is
-    being observed is defined by Observable descendants and their managers. For example,
-    instances of pyre.calc.Node are observable by other nodes whose value depends on them so
-    that the dependents can be notified about value changes and forced to recompute their own
-    value.
+    Observers, i.e. clients of the observable, register event handlers
+    that will be invoked to notify them whenever something interesting
+    happens to the observable. The nature of what is being observed is
+    defined by Observable descendants and their managers. For example,
+    instances of pyre.calc.Node are observable by other nodes whose
+    value depends on them so that the dependents can be notified about
+    value changes and forced to recompute their own value.
 
-    The event handlers are callables that take the observable instance as their single
-    argument.
+    The event handlers are callables that take the observable instance
+    as their single argument.
 
     interface:
-      addObserver: registers its callable argument with the list of handlers to invoke
-      removeObserver: remove an event handler from the list of handlers to invoke
-      notify: invoke the registered handlers in the order in which they were registered
+      addObserver: registers its callable argument with the list of
+      handlers to invoke removeObserver: remove an event handler from
+      the list of handlers to invoke notify: invoke the registered
+      handlers in the order in which they were registered
     """
-
-
     def notify(self, other=()):
         """Notify all observers."""
-        # build a list before notification, just in case the observer's callback behavior
-        # involves removing itself from our callback set
+        # build a list before notification, just in case the observer's
+        # callback behavior involves removing itself from our callback set
         semaphors = (self,) + other
         for callable in tuple(self._observers):
             callable(semaphors)
         return
 
-
     # callback management
+
     def addObserver(self, callable):
         """Add callable to the set of observers."""
         f = weak_ref(callable, fallback=_fbRemoveObserver)
         self._observers.add(f)
         return
 
-
     def removeObserver(self, callable):
         """Remove callable from the set of observers."""
         f = weak_ref(callable)
         self._observers.remove(f)
         return
 
-
     def hasObserver(self, callable):
         """True if `callable` is present in the set of observers."""
         f = weak_ref(callable)
         rv = f in self._observers
         return rv
 
-
     # meta methods
+
     def __init__(self, **kwds):
         super(Observable, self).__init__(**kwds)
         self._observers = set()
@@ -80,6 +78,7 @@ def __init__(self, **kwds):
 
 # Local helpers --------------------------------------------------------------
 
+
 def _fbRemoveObserver(fobs, semaphors):
     # Remove WeakBoundMethod `fobs` from the observers of notifying object.
     # This is called from Observable.notify when the WeakBoundMethod

src/diffpy/srfit/util/tagmanager.py

@@ -41,12 +41,10 @@ def __init__(self):
         self.silent = True
         return
 
-
     def alltags(self):
         """Get all tags managed by the TagManager."""
         return self._tagdict.keys()
 
-
     def tag(self, obj, *tags):
         """Tag an object.
 
@@ -62,7 +60,6 @@ def tag(self, obj, *tags):
             oset.add(obj)
         return
 
-
     def untag(self, obj, *tags):
         """Remove tags from an object.
 
@@ -84,7 +81,6 @@ def untag(self, obj, *tags):
 
         return
 
-
     def tags(self, obj):
         """Get all tags on an object.
 
@@ -93,7 +89,6 @@ def tags(self, obj):
         tags = [k for (k, v) in self._tagdict.items() if obj in v]
         return tags
 
-
     def hasTags(self, obj, *tags):
         """Determine if an object has all passed tags.
 
@@ -103,7 +98,6 @@ def hasTags(self, obj, *tags):
         result = all(obj in s for s in setgen)
         return result
 
-
     def union(self, *tags):
         """Get all objects that have any of the passed tags.
 
@@ -115,7 +109,6 @@ def union(self, *tags):
         objs = functools.reduce(set.union, setgen)
         return objs
 
-
     def intersection(self, *tags):
         """Get all objects that have all of the passed tags.
 
@@ -127,7 +120,6 @@ def intersection(self, *tags):
         objs = functools.reduce(set.intersection, setgen)
         return objs
 
-
     def verifyTags(self, *tags):
         """Check that tags are all extant.
 
@@ -138,10 +130,8 @@ def verifyTags(self, *tags):
         for tag in tags:
             if tag not in keys:
                 raise KeyError("Tag '%s' does not exist" % tag)
-
         return True
 
-
     def __getObjectSet(self, tag):
         """Helper function for getting an object set with given tag.
 
@@ -154,7 +144,6 @@ def __getObjectSet(self, tag):
             oset = set()
         return oset
 
-
 # End class TagManager
 
 # End of file

src/diffpy/srfit/util/weakrefcallable.py

@@ -23,7 +23,7 @@
 
 
 class WeakBoundMethod(object):
-    """\ Callable wrapper to a bound method stored as a weak reference.
+    """Callable wrapper to a bound method stored as a weak reference.
 
     Support storage of bound methods without keeping the associated objects
     alive forever.  Provide facility for a fallback function to be used
@@ -69,7 +69,6 @@ def __init__(self, f, fallback=None):
         self._wref = weakref.ref(f.__self__)
         return
 
-
     def __call__(self, *args, **kwargs):
         """Call the wrapped method if the weak-referenced object is alive.
 
@@ -95,20 +94,17 @@ def __call__(self, *args, **kwargs):
         emsg = "Object bound to {} does not exist.".format(self.function)
         raise ReferenceError(emsg)
 
-
     # support use of this class in hashed collections
 
     def __hash__(self):
         return hash((self.function, self._wref))
 
-
     def __eq__(self, other):
         rv = (self.function == other.function and
               (self._wref == other._wref or
                None is self._wref() is other._wref()))
         return rv
 
-
     def __ne__(self, other):
         return not self.__eq__(other)
 
@@ -126,7 +122,6 @@ def __getstate__(self):
         state = (self._class, nm, self.fallback, mobj)
         return state
 
-
     def __setstate__(self, state):
         """Restore the weak reference in this wrapper upon unpickling."""
         (self._class, nm, self.fallback, mobj) = state
@@ -139,14 +134,12 @@ def __setstate__(self, state):
         self._wref = weakref.ref(mobj)
         return
 
-
     @staticmethod
     def __mimic_empty_ref():
         return None
 
 # end of class WeakBoundMethod
 
-# ----------------------------------------------------------------------------
 
 def weak_ref(f, fallback=None):
     """Create weak-reference wrapper to a bound method.