replace double quotes with single quotes

setup.py

@@ -27,7 +27,7 @@
     },
     author='Alec Thomas',
     author_email='alec@swapoff.org',
-    python_requires=">=3.8",
+    python_requires='>=3.8',
     classifiers=[
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',

voluptuous/schema_builder.py

@@ -138,7 +138,7 @@ def raises(
         if regex is not None:
             assert re.search(regex, str(e)), '%r does not match %r' % (str(e), regex)
     else:
-        raise AssertionError(f"Did not raise exception {exc.__name__}")
+        raise AssertionError(f'Did not raise exception {exc.__name__}')
 
 
 def Extra(_) -> None:
@@ -268,7 +268,7 @@ def __str__(self):
         return str(self.schema)
 
     def __repr__(self):
-        return "<Schema(%s, extra=%s, required=%s) object at 0x%x>" % (
+        return '<Schema(%s, extra=%s, required=%s) object at 0x%x>' % (
             self.schema,
             self._extra_to_name.get(self.extra, '??'),
             self.required,
@@ -290,7 +290,7 @@ def _compile(self, schema):
             return lambda _, v: v
         if schema is Self:
             return lambda p, v: self._compiled(p, v)
-        elif hasattr(schema, "__voluptuous_compile__"):
+        elif hasattr(schema, '__voluptuous_compile__'):
             return schema.__voluptuous_compile__(self)
         if isinstance(schema, Object):
             return self._compile_object(schema)
@@ -983,7 +983,7 @@ def __init__(
     ) -> None:
         if cls and not issubclass(cls, er.Invalid):
             raise er.SchemaError(
-                "Msg can only use subclases of Invalid as custom class"
+                'Msg can only use subclases of Invalid as custom class'
             )
         self._schema = schema
         self.schema = Schema(schema)
@@ -1127,7 +1127,7 @@ class Exclusive(Optional):
     ...     }
     ... })
 
-    >>> with raises(er.MultipleInvalid, "Please, use only one type of authentication at the same time. @ data[<auth>]"):
+    >>> with raises(er.MultipleInvalid, 'Please, use only one type of authentication at the same time. @ data[<auth>]'):
     ...     schema({'classic': {'email': 'foo@example.com', 'password': 'bar'},
     ...             'social': {'social_network': 'barfoo', 'token': 'tEMp'}})
     """
@@ -1168,16 +1168,16 @@ class Inclusive(Optional):
 
     For example, API can return 'height' and 'width' together, but not separately.
 
-    >>> msg = "Height and width must exist together"
+    >>> msg = 'Height and width must exist together'
     >>> schema = Schema({
     ...     Inclusive('height', 'size', msg=msg): int,
     ...     Inclusive('width', 'size', msg=msg): int
     ... })
 
-    >>> with raises(er.MultipleInvalid, msg + " @ data[<size>]"):
+    >>> with raises(er.MultipleInvalid, msg + ' @ data[<size>]'):
     ...     schema({'height': 100})
 
-    >>> with raises(er.MultipleInvalid, msg + " @ data[<size>]"):
+    >>> with raises(er.MultipleInvalid, msg + ' @ data[<size>]'):
     ...     schema({'width': 100})
 
     >>> data = {'height': 100, 'width': 100}
@@ -1231,7 +1231,7 @@ class Remove(Marker):
     keys will be treated as extras.
 
     >>> schema = Schema({str: int, Remove(int): str})
-    >>> with raises(er.MultipleInvalid, "extra keys not allowed @ data[1]"):
+    >>> with raises(er.MultipleInvalid, 'extra keys not allowed @ data[1]'):
     ...    schema({'keep': 1, 1: 1.0})
     >>> schema({1: 'red', 'red': 1, 2: 'green'})
     {'red': 1}
@@ -1245,7 +1245,7 @@ def __call__(self, schema: Schemable):
         return self.__class__
 
     def __repr__(self):
-        return "Remove(%r)" % (self.schema,)
+        return 'Remove(%r)' % (self.schema,)
 
     def __hash__(self):
         return object.__hash__(self)
@@ -1284,7 +1284,7 @@ def message(
     """
     if cls and not issubclass(cls, er.Invalid):
         raise er.SchemaError(
-            "message can only use subclases of Invalid as custom class"
+            'message can only use subclases of Invalid as custom class'
         )
 
     def decorator(f):