Use isinstance(x, y) instead of type(x) == y

Fixes pylint C0123.

yamllint/config.py

@@ -52,7 +52,7 @@ class YamlLintConfig(object):
         assert isinstance(base_config, YamlLintConfig)
 
         for rule in self.rules:
-            if (type(self.rules[rule]) == dict and
+            if (isinstance(self.rules[rule], dict) and
                     rule in base_config.rules and
                     base_config.rules[rule] is not False):
                 base_config.rules[rule].update(self.rules[rule])
@@ -70,7 +70,7 @@ class YamlLintConfig(object):
         except Exception as e:
             raise YamlLintConfigError('invalid config: %s' % e)
 
-        if type(conf) != dict:
+        if not isinstance(conf, dict):
             raise YamlLintConfigError('invalid config: not a dict')
 
         self.rules = conf.get('rules', {})
@@ -85,7 +85,7 @@ class YamlLintConfig(object):
                 raise YamlLintConfigError('invalid config: %s' % e)
 
         if 'ignore' in conf:
-            if type(conf['ignore']) != str:
+            if not isinstance(conf['ignore'], str):
                 raise YamlLintConfigError(
                     'invalid config: ignore should contain file patterns')
             self.ignore = pathspec.PathSpec.from_lines(
@@ -107,10 +107,10 @@ def validate_rule_conf(rule, conf):
     elif conf == 'enable':
         conf = {}
 
-    if type(conf) == dict:
+    if isinstance(conf, dict):
         if ('ignore' in conf and
-                type(conf['ignore']) != pathspec.pathspec.PathSpec):
+                not isinstance(conf['ignore'], pathspec.pathspec.PathSpec)):
-            if type(conf['ignore']) != str:
+            if not isinstance(conf['ignore'], str):
                 raise YamlLintConfigError(
                     'invalid config: ignore should contain file patterns')
             conf['ignore'] = pathspec.PathSpec.from_lines(
@@ -130,14 +130,14 @@ def validate_rule_conf(rule, conf):
                 raise YamlLintConfigError(
                     'invalid config: unknown option "%s" for rule "%s"' %
                     (optkey, rule.ID))
-            if type(options[optkey]) == tuple:
+            if isinstance(options[optkey], tuple):
                 if (conf[optkey] not in options[optkey] and
                         type(conf[optkey]) not in options[optkey]):
                     raise YamlLintConfigError(
                         'invalid config: option "%s" of "%s" should be in %s'
                         % (optkey, rule.ID, options[optkey]))
             else:
-                if type(conf[optkey]) != options[optkey]:
+                if not isinstance(conf[optkey], options[optkey]):
                     raise YamlLintConfigError(
                         'invalid config: option "%s" of "%s" should be %s'
                         % (optkey, rule.ID, options[optkey].__name__))

yamllint/linter.py

@@ -226,7 +226,7 @@ def run(input, conf, filepath=None):
     if conf.is_file_ignored(filepath):
         return ()
 
-    if type(input) in (type(b''), type(u'')):  # compat with Python 2 & 3
+    if isinstance(input, (type(b''), type(u''))):  # compat with Python 2 & 3
         return _run(input, conf, filepath)
     elif hasattr(input, 'read'):  # Python 2's file or Python 3's io.IOBase
         # We need to have everything in memory to parse correctly

yamllint/rules/document_end.py

@@ -86,14 +86,16 @@ CONF = {'present': bool}
 
 def check(conf, token, prev, next, nextnext, context):
     if conf['present']:
-        if (isinstance(token, yaml.StreamEndToken) and
+        is_stream_end = isinstance(token, yaml.StreamEndToken)
-                not (isinstance(prev, yaml.DocumentEndToken) or
+        is_start = isinstance(token, yaml.DocumentStartToken)
-                     isinstance(prev, yaml.StreamStartToken))):
+        prev_is_end_or_stream_start = isinstance(
+            prev, (yaml.DocumentEndToken, yaml.StreamStartToken)
+        )
+
+        if is_stream_end and not prev_is_end_or_stream_start:
             yield LintProblem(token.start_mark.line, 1,
                               'missing document end "..."')
-        elif (isinstance(token, yaml.DocumentStartToken) and
+        elif is_start and not prev_is_end_or_stream_start:
-                not (isinstance(prev, yaml.DocumentEndToken) or
-                     isinstance(prev, yaml.StreamStartToken))):
             yield LintProblem(token.start_mark.line + 1, 1,
                               'missing document end "..."')
 

yamllint/rules/indentation.py

@@ -224,7 +224,7 @@ def check_scalar_indentation(conf, token, context):
 
     def compute_expected_indent(found_indent):
         def detect_indent(base_indent):
-            if type(context['spaces']) is not int:
+            if not isinstance(context['spaces'], int):
                 context['spaces'] = found_indent - base_indent
             return base_indent + context['spaces']
 
@@ -312,7 +312,7 @@ def _check(conf, token, prev, next, nextnext, context):
                      token.start_mark.line + 1 > context['cur_line'])
 
     def detect_indent(base_indent, next):
-        if type(context['spaces']) is not int:
+        if not isinstance(context['spaces'], int):
             context['spaces'] = next.start_mark.column - base_indent
         return base_indent + context['spaces']