*: remove explicit object super class

closes #635

capa/engine.py

@@ -17,7 +17,7 @@ import capa.features.common
 from capa.features.common import Feature
 
 
-class Statement(object):
+class Statement:
     """
     superclass for structural nodes, such as and/or/not.
     this exists to provide a default impl for `__str__` and `__repr__`,
@@ -69,7 +69,7 @@ class Statement(object):
                     self.children[i] = new
 
 
-class Result(object):
+class Result:
     """
     represents the results of an evaluation of statements against features.
 

capa/features/common.py

@@ -54,7 +54,7 @@ def escape_string(s: str) -> str:
     return s
 
 
-class Feature(object):
+class Feature:
     def __init__(self, value: Union[str, int, bytes], arch=None, description=None):
         """
         Args:
@@ -228,7 +228,7 @@ class _MatchedRegex(Regex):
         )
 
 
-class StringFactory(object):
+class StringFactory:
     def __new__(cls, value: str, description=None):
         if value.startswith("/") and (value.endswith("/") or value.endswith("/i")):
             return Regex(value, description=description)

capa/features/extractors/base_extractor.py

@@ -26,7 +26,7 @@ BBHandle = SupportsInt
 InsnHandle = SupportsInt
 
 
-class FeatureExtractor(object):
+class FeatureExtractor:
     """
     FeatureExtractor defines the interface for fetching features from a sample.
 

capa/ida/plugin/item.py

@@ -31,7 +31,7 @@ def location_to_hex(location):
     return "%08X" % location
 
 
-class CapaExplorerDataItem(object):
+class CapaExplorerDataItem:
     """store data for CapaExplorerDataModel"""
 
     def __init__(self, parent, data, can_check=True):

capa/rules.py

@@ -429,7 +429,7 @@ def second(s: List[Any]) -> Any:
     return s[1]
 
 
-class Rule(object):
+class Rule:
     def __init__(self, name, scope, statement, meta, definition=""):
         super(Rule, self).__init__()
         self.name = name
@@ -863,7 +863,7 @@ def topologically_order_rules(rules: List[Rule]) -> List[Rule]:
     return ret
 
 
-class RuleSet(object):
+class RuleSet:
     """
     a ruleset is initialized with a collection of rules, which it verifies and sorts into scopes.
     each set of scoped rules is sorted topologically, which enables rules to match on past rule matches.

scripts/lint.py

@@ -49,7 +49,7 @@ def green(s):
     return termcolor.colored(s, "green")
 
 
-class Lint(object):
+class Lint:
     WARN = orange("WARN")
     FAIL = red("FAIL")