style fix

caldav/davclient.py

@@ -211,7 +211,7 @@ def _parse_response(self, response) -> Tuple[str, List[_Element], Optional[Any]]
         status = None
         href: Optional[str] = None
         propstats: List[_Element] = []
-        check_404 = False ## special for purelymail
+        check_404 = False  ## special for purelymail
         error.assert_(response.tag == dav.Response.tag)
         for elem in response:
             if elem.tag == dav.Status.tag:
@@ -224,13 +224,15 @@ def _parse_response(self, response) -> Tuple[str, List[_Element], Optional[Any]]
                 href = unquote(elem.text)
             elif elem.tag == dav.PropStat.tag:
                 propstats.append(elem)
-            elif elem.tag == '{DAV:}error':
+            elif elem.tag == "{DAV:}error":
                 ## This happens with purelymail on a 404.
                 ## This code is mostly moot, but in debug
                 ## mode I want to be sure we do not toss away any data
                 children = elem.getchildren()
-                error.assert_(len(children)==1)
-                error.assert_(children[0].tag=='{https://purelymail.com}does-not-exist')
+                error.assert_(len(children) == 1)
+                error.assert_(
+                    children[0].tag == "{https://purelymail.com}does-not-exist"
+                )
                 check_404 = True
             else:
                 ## i.e. purelymail may contain one more tag, <error>...</error>
@@ -240,7 +242,7 @@ def _parse_response(self, response) -> Tuple[str, List[_Element], Optional[Any]]
                 error.weirdness("unexpected element found in response", elem)
         error.assert_(href)
         if check_404:
-            error.assert_('404' in status)
+            error.assert_("404" in status)
         ## TODO: is this safe/sane?
         ## Ref https://github.com/python-caldav/caldav/issues/435 the paths returned may be absolute URLs,
         ## but the caller expects them to be paths.  Could we have issues when a server has same path

caldav/lib/error.py

@@ -25,13 +25,18 @@
 else:
     log.setLevel(logging.WARNING)
 
+
 def weirdness(*reasons):
     from caldav.lib.debug import xmlstring
+
     reason = " : ".join([xmlstring(x) for x in reasons])
     log.warning(f"Deviation from expectations found: {reason}")
     if debugmode == "DEBUG_PDB":
         log.error(f"Dropping into debugger due to {reason}")
-        import pdb; pdb.set_trace()
+        import pdb
+
+        pdb.set_trace()
+
 
 def assert_(condition: object) -> None:
     try:
@@ -43,7 +48,9 @@ def assert_(condition: object) -> None:
             )
         elif debugmode == "DEBUG_PDB":
             log.error("Deviation from expectations found.  Dropping into debugger")
-            import pdb; pdb.set_trace()
+            import pdb
+
+            pdb.set_trace()
         else:
             raise