remove more Python2 compatibility (#560)

README.md

@@ -716,7 +716,7 @@ cur.executemany("INSERT INTO table (a, b) VALUES (%s, %s)", [[100, value]], use_
 ##### Register new SQL literal adapters
 It is possible to adapt new Python types to SQL literals via `Cursor.register_sql_literal_adapter(py_class_or_type, adapter_function)` function. Example:
 ```python
-class Point(object):
+class Point:
     def __init__(self, x, y):
         self.x = x
         self.y = y

requirements-dev.txt

@@ -1,6 +1,5 @@
 pytest
 pytest-timeout
 python-dateutil
-six
 tox
 #kerberos

setup.py

@@ -59,7 +59,6 @@
     python_requires=">=3.7",
     install_requires=[
         'python-dateutil>=1.5',
-        'six>=1.10.0'
     ],
     classifiers=[
         "Development Status :: 5 - Production/Stable",

vertica_python/compat.py

@@ -63,8 +63,6 @@
 * `real_types`
 """
 
-import six as _six
-
 
 def as_bytes(bytes_or_text, encoding='utf-8'):
     """Converts either bytes or unicode to `bytes`, using utf-8 encoding for text.
@@ -76,7 +74,7 @@ def as_bytes(bytes_or_text, encoding='utf-8'):
     Raises:
       TypeError: If `bytes_or_text` is not a binary or unicode string.
     """
-    if isinstance(bytes_or_text, _six.text_type):
+    if isinstance(bytes_or_text, str):
         return bytes_or_text.encode(encoding)
     elif isinstance(bytes_or_text, bytearray):
         return bytes(bytes_or_text)
@@ -97,7 +95,7 @@ def as_text(bytes_or_text, encoding='utf-8'):
     Raises:
       TypeError: If `bytes_or_text` is not a binary or unicode string.
     """
-    if isinstance(bytes_or_text, _six.text_type):
+    if isinstance(bytes_or_text, str):
         return bytes_or_text
     elif isinstance(bytes_or_text, (bytes, bytearray)):
         return bytes_or_text.decode(encoding)
@@ -106,10 +104,7 @@ def as_text(bytes_or_text, encoding='utf-8'):
 
 
 # Convert an object to a `str` in both Python 2 and 3.
-if _six.PY2:
-    as_str = as_bytes
-else:
-    as_str = as_text
+as_str = as_text
 
 
 def as_str_any(value):
@@ -126,7 +121,7 @@ def as_str_any(value):
 
 
 # Either bytes or text.
-bytes_or_text_types = (bytes, bytearray, _six.text_type)
+bytes_or_text_types = (bytes, bytearray, str)
 
 _allowed_symbols = [
     'as_str',

vertica_python/datatypes.py

@@ -84,7 +84,7 @@ def Binary(string):
     return Bytea(string)
 
 
-class VerticaType(object):
+class VerticaType:
     UNKNOWN = 4
     BOOL = 5
     INT8 = 6

vertica_python/tests/unit_tests/test_sql_literal.py

@@ -59,7 +59,7 @@ def test_default_adapters(self):
         self.assertEqual(cursor.object_to_sql_literal(p), "(11,22,33)")
 
     def test_register_adapters(self):
-        class Point(object):
+        class Point:
             def __init__(self, x, y):
                 self.x = x
                 self.y = y

vertica_python/vertica/column.py

@@ -46,7 +46,7 @@
 
 # Data of a particular SQL data type might be transmitted in either "text" format or "binary" format.
 # The desired format for any column is specified by a format code.
-class FormatCode(object):
+class FormatCode:
     TEXT = 0
     BINARY = 1
 
@@ -61,7 +61,7 @@ class ColumnTuple(NamedTuple):
     null_ok: bool
 
 
-class Column(object):
+class Column:
     def __init__(self, col) -> None:
         # Describe one query result column
         self.name = col['name']

vertica_python/vertica/connection.py

@@ -142,7 +142,7 @@ class _AddressEntry(NamedTuple):
     data: Any
 
 
-class _AddressList(object):
+class _AddressList:
     def __init__(self, host: str, port: Union[int, str],
                  backup_nodes: List[Union[str, Tuple[str, Union[int, str]]]],
                  logger: logging.Logger) -> None:
@@ -258,7 +258,7 @@ def _generate_session_label() -> str:
     )
 
 
-class Connection(object):
+class Connection:
     def __init__(self, options: Optional[Dict[str, Any]] = None) -> None:
         self.parameters: Dict[str, Union[str, int]] = {}
         self.session_id = None

vertica_python/vertica/cursor.py

@@ -136,7 +136,7 @@
 DEFAULT_BUFFER_SIZE = 131072
 
 
-class Cursor(object):
+class Cursor:
     # NOTE: this is used in executemany and is here for pandas compatibility
     _insert_statement = re.compile(RE_BASIC_INSERT_STAT, re.U | re.I)
 

vertica_python/vertica/deserializer.py

@@ -34,7 +34,7 @@
 from ..vertica.column import FormatCode
 
 
-class Deserializer(object):
+class Deserializer:
     def get_row_deserializers(self,
                               columns: List[Column],
                               custom_converters: Dict[int, Callable[[bytes, Dict[str, Any]], Any]],

vertica_python/vertica/log.py

@@ -42,7 +42,7 @@
     from typing import Union
 from ..os_utils import ensure_dir_exists
 
-class VerticaLogging(object):
+class VerticaLogging:
 
     @classmethod
     def setup_logging(cls, logger_name: str, logfile: str,

vertica_python/vertica/messages/message.py

@@ -58,7 +58,7 @@
 from ..messages import *
 
 
-class Message(object):
+class Message:
     __metaclass__ = ABCMeta
 
     def __init__(self):