[fix] prepare for pylint 2.14.0

Remove issue reported by Pylint 2.14.0:

- no-self-use: has been moved to optional extension [1]
- The refactoring checker now also raises 'consider-using-generator' messages
  for max(), min() and sum(). [2]

.pylintrc:
  - <option name>-hint has been removed since long, Pylint 2.14.0 raises an
    error on invalid options
  - bad-continuation and bad-whitespace have been removed [3]

[1] https://pylint.pycqa.org/en/latest/whatsnew/2/2.14/summary.html#removed-checkers
[2] https://pylint.pycqa.org/en/latest/whatsnew/2/2.14/full.html#what-s-new-in-pylint-2-14-0
[2] https://pylint.pycqa.org/en/latest/whatsnew/2/2.6/summary.html#summary-release-highlights

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

12 files changed, 9 insertions, 52 deletions

diff --git a/.pylintrc b/.pylintrc
index f2dd716d3..51cea773e 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -59,8 +59,7 @@ confidence=
 # --enable=similarities". If you want to run only the classes checker, but have
 # no Warning level messages displayed, use"--disable=all --enable=classes
 # --disable=W"
-disable=bad-whitespace,
-        duplicate-code,
+disable=duplicate-code,
         missing-function-docstring,
         consider-using-f-string,
 
@@ -108,39 +107,21 @@ max-nested-blocks=5
 
 [BASIC]
 
-# List of builtins function names that should not be used, separated by a comma
-bad-functions=map,filter,apply,input
-
-# Naming hint for argument names
-argument-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
-
 # Regular expression matching correct argument names
 argument-rgx=(([a-z][a-zA-Z0-9_]{2,30})|(_[a-z0-9_]*))$
 
-# Naming hint for attribute names
-attr-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
-
 # Regular expression matching correct attribute names
 attr-rgx=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*)|([A-Z0-9_]*))$
 
 # Bad variable names which should always be refused, separated by a comma
 bad-names=foo,bar,baz,toto,tutu,tata
 
-# Naming hint for class attribute names
-class-attribute-name-hint=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
-
 # Regular expression matching correct class attribute names
 class-attribute-rgx=([A-Za-z_][A-Za-z0-9_]{2,30}|(__.*__))$
 
-# Naming hint for class names
-class-name-hint=[A-Z_][a-zA-Z0-9]+$
-
 # Regular expression matching correct class names
 class-rgx=[A-Z_][a-zA-Z0-9]+$
 
-# Naming hint for constant names
-const-name-hint=(([A-Z_][A-Z0-9_]*)|(__.*__))$
-
 # Regular expression matching correct constant names
 const-rgx=(([a-zA-Z_][a-zA-Z0-9_]*)|(__.*__))$
 #const-rgx=[f]?[A-Z_][a-zA-Z0-9_]{2,30}$
@@ -149,9 +130,6 @@ const-rgx=(([a-zA-Z_][a-zA-Z0-9_]*)|(__.*__))$
 # ones are exempt.
 docstring-min-length=-1
 
-# Naming hint for function names
-function-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
-
 # Regular expression matching correct function names
 function-rgx=(([a-z][a-zA-Z0-9_]{2,30})|(_[a-z0-9_]*))$
 
@@ -161,21 +139,12 @@ good-names=i,j,k,ex,Run,_,log,cfg,id
 # Include a hint for the correct naming format with invalid-name
 include-naming-hint=no
 
-# Naming hint for inline iteration names
-inlinevar-name-hint=[A-Za-z_][A-Za-z0-9_]*$
-
 # Regular expression matching correct inline iteration names
 inlinevar-rgx=[A-Za-z_][A-Za-z0-9_]*$
 
-# Naming hint for method names
-method-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
-
 # Regular expression matching correct method names
 method-rgx=(([a-z][a-zA-Z0-9_]{2,30})|(_[a-z0-9_]*))$
 
-# Naming hint for module names
-module-name-hint=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
-
 # Regular expression matching correct module names
 #module-rgx=(([a-z_][a-z0-9_]*)|([A-Z][a-zA-Z0-9]+))$
 module-rgx=([a-z_][a-z0-9_]*)$
@@ -192,9 +161,6 @@ no-docstring-rgx=^_
 # to this list to register other decorators that produce valid properties.
 property-classes=abc.abstractproperty
 
-# Naming hint for variable names
-variable-name-hint=(([a-z][a-z0-9_]{2,30})|(_[a-z0-9_]*))$
-
 # Regular expression matching correct variable names
 variable-rgx=(([a-z][a-zA-Z0-9_]{2,30})|(_[a-z0-9_]*)|([a-z]))$
 
@@ -220,12 +186,6 @@ max-line-length=120
 # Maximum number of lines in a module
 max-module-lines=2000
 
-# List of optional constructs for which whitespace checking is disabled. `dict-
-# separator` is used to allow tabulation in dicts, etc.: {1  : 1,\n222: 2}.
-# `trailing-comma` allows a space between comma and closing bracket: (a, ).
-# `empty-line` allows space-only lines.
-no-space-check=trailing-comma,dict-separator
-
 # Allow the body of a class to be on the same line as the declaration if body
 # contains single statement.No config file found, using default configuration
 
diff --git a/searx/engines/wikidata.py b/searx/engines/wikidata.py
index 592a51ec8..b7c318e53 100644
--- a/searx/engines/wikidata.py
+++ b/searx/engines/wikidata.py
@@ -464,7 +464,6 @@ def get_attributes(language):
 
 
 class WDAttribute:
-    # pylint: disable=no-self-use
     __slots__ = ('name',)
 
     def __init__(self, name):
@@ -626,7 +625,6 @@ class WDImageAttribute(WDURLAttribute):
 
 
 class WDDateAttribute(WDAttribute):
-    # pylint: disable=no-self-use
     def get_select(self):
         return '?{name} ?{name}timePrecision ?{name}timeZone ?{name}timeCalendar'.replace('{name}', self.name)
 
diff --git a/searx/infopage/__init__.py b/searx/infopage/__init__.py
index f8be73f09..4aebfa5a7 100644
--- a/searx/infopage/__init__.py
+++ b/searx/infopage/__init__.py
@@ -81,7 +81,7 @@ class InfoPage:
             MarkdownIt("commonmark", {"typographer": True}).enable(["replacements", "smartquotes"]).render(self.content)
         )
 
-    def get_ctx(self):  # pylint: disable=no-self-use
+    def get_ctx(self):
         """Jinja context to render :py:obj:`InfoPage.content`"""
 
         def _md_link(name, url):
diff --git a/searx/metrics/__init__.py b/searx/metrics/__init__.py
index bc755b96b..18d2170df 100644
--- a/searx/metrics/__init__.py
+++ b/searx/metrics/__init__.py
@@ -160,6 +160,7 @@ def get_reliabilities(engline_name_list, checker_results):
             # even if there is no exception
             reliablity = 0
         else:
+            # pylint: disable=consider-using-generator
             reliablity = 100 - sum([error['percentage'] for error in errors if not error.get('secondary')])
 
         reliabilities[engine_name] = {
diff --git a/searx/network/__init__.py b/searx/network/__init__.py
index e8dddd6a0..06c9f75a4 100644
--- a/searx/network/__init__.py
+++ b/searx/network/__init__.py
@@ -13,7 +13,7 @@ from typing import Iterable, Tuple
 import httpx
 import anyio
 
-from .network import get_network, initialize, check_network_configuration
+from .network import get_network, initialize, check_network_configuration  # pylint:disable=cyclic-import
 from .client import get_loop
 from .raise_for_httperror import raise_for_httperror
 
diff --git a/searx/plugins/__init__.py b/searx/plugins/__init__.py
index 3d431f329..8ece94358 100644
--- a/searx/plugins/__init__.py
+++ b/searx/plugins/__init__.py
@@ -198,7 +198,6 @@ class PluginStore:
         self.plugins.append(plugin)
 
     def call(self, ordered_plugin_list, plugin_type, *args, **kwargs):
-        # pylint: disable=no-self-use
         ret = True
         for plugin in ordered_plugin_list:
             if hasattr(plugin, plugin_type):
diff --git a/searx/plugins/search_on_category_select.py b/searx/plugins/search_on_category_select.py
index 99066e23e..85b73a9bd 100644
--- a/searx/plugins/search_on_category_select.py
+++ b/searx/plugins/search_on_category_select.py
@@ -18,7 +18,7 @@ from flask_babel import gettext
 
 name = gettext('Search on category select')
 description = gettext(
-    'Perform search immediately if a category selected. ' 'Disable to select multiple categories. (JavaScript required)'
+    'Perform search immediately if a category selected. Disable to select multiple categories. (JavaScript required)'
 )
 default_on = True
 preference_section = 'ui'
diff --git a/searx/preferences.py b/searx/preferences.py
index cd943af66..46b7b39d7 100644
--- a/searx/preferences.py
+++ b/searx/preferences.py
@@ -208,11 +208,9 @@ class BooleanChoices:
         self.default_choices = dict(choices)
 
     def transform_form_items(self, items):
-        # pylint: disable=no-self-use
         return items
 
     def transform_values(self, values):
-        # pylint: disable=no-self-use
         return values
 
     def parse_cookie(self, data_disabled: str, data_enabled: str):
diff --git a/searx/search/__init__.py b/searx/search/__init__.py
index e790bd05e..c517814de 100644
--- a/searx/search/__init__.py
+++ b/searx/search/__init__.py
@@ -133,7 +133,7 @@ class Search:
 
     def search_multiple_requests(self, requests):
         # pylint: disable=protected-access
-        search_id = uuid4().__str__()
+        search_id = str(uuid4())
 
         for engine_name, query, request_params in requests:
             th = threading.Thread(  # pylint: disable=invalid-name
diff --git a/searx/search/processors/abstract.py b/searx/search/processors/abstract.py
index b7703496b..d4822fc56 100644
--- a/searx/search/processors/abstract.py
+++ b/searx/search/processors/abstract.py
@@ -170,5 +170,5 @@ class EngineProcessor(ABC):
             tests.update(self.get_default_tests())
         return tests
 
-    def get_default_tests(self):  # pylint: disable=no-self-use
+    def get_default_tests(self):
         return {}
diff --git a/searx/utils.py b/searx/utils.py
index abc330be2..15f4d7092 100644
--- a/searx/utils.py
+++ b/searx/utils.py
@@ -464,7 +464,7 @@ def to_string(obj: Any) -> str:
     if isinstance(obj, str):
         return obj
     if hasattr(obj, '__str__'):
-        return obj.__str__()
+        return str(obj)
     return repr(obj)
 
 
diff --git a/searx/webapp.py b/searx/webapp.py
index fa5ca0605..493468a22 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -1048,6 +1048,7 @@ def preferences():
             # even if there is no exception
             reliablity = 0
         else:
+            # pylint: disable=consider-using-generator
             reliablity = 100 - sum([error['percentage'] for error in errors if not error.get('secondary')])
 
         reliabilities[e.name] = {