Drop python2 support and remove six dependency

benchmarks/serialization.py

@@ -6,7 +6,6 @@
 small number of fields.
 """
 
-from __future__ import unicode_literals
 
 import time
 

docs/source/development.rst

@@ -3,8 +3,6 @@ Contributing to Eliot
 
 To run the full test suite, the Daemontools package should be installed.
 
-All modules should have the ``from __future__ import unicode_literals`` statement, to ensure Unicode is used by default.
-
 Coding standard is PEP8, with the only exception being camel case methods for the Twisted-related modules.
 Some camel case methods remain for backwards compatibility reasons with the old coding standard.
 

eliot/__init__.py

@@ -1,6 +1,7 @@
 """
 Eliot: Logging for Complex & Distributed Systems.
 """
+
 from warnings import warn
 
 # Expose the public API:

eliot/_action.py

@@ -5,8 +5,6 @@
 top-level actions.
 """
 
-from __future__ import unicode_literals, absolute_import
-
 import threading
 from uuid import uuid4
 from contextlib import contextmanager
@@ -16,7 +14,6 @@
 
 from pyrsistent import field, PClass, optional, pmap_field, pvector
 from boltons.funcutils import wraps
-from six import text_type as unicode, PY3
 
 from ._message import (
     WrittenMessage,
@@ -114,9 +111,9 @@ def toString(self):
         """
         Convert to a Unicode string, for serialization purposes.
 
-        @return: L{unicode} representation of the L{TaskLevel}.
+        @return: L{str} representation of the L{TaskLevel}.
         """
-        return "/" + "/".join(map(unicode, self._level))
+        return "/" + "/".join(map(str, self._level))
 
     def next_sibling(self):
         """
@@ -569,7 +566,7 @@ class WrittenAction(PClass):
     start_message = field(type=optional(WrittenMessage), mandatory=True, initial=None)
     end_message = field(type=optional(WrittenMessage), mandatory=True, initial=None)
     task_level = field(type=TaskLevel, mandatory=True)
-    task_uuid = field(type=unicode, mandatory=True, factory=unicode)
+    task_uuid = field(type=str, mandatory=True, factory=str)
     # Pyrsistent doesn't support pmap_field with recursive types.
     _children = pmap_field(TaskLevel, object)
 
@@ -838,7 +835,7 @@ def startTask(logger=None, action_type="", _serializers=None, **fields):
     @return: A new L{Action}.
     """
     action = Action(
-        logger, unicode(uuid4()), TaskLevel(level=[]), action_type, _serializers
+        logger, str(uuid4()), TaskLevel(level=[]), action_type, _serializers
     )
     action._start(fields)
     return action
@@ -909,14 +906,11 @@ def log_call(
         )
 
     if action_type is None:
-        if PY3:
-            action_type = "{}.{}".format(
-                wrapped_function.__module__, wrapped_function.__qualname__
-            )
-        else:
-            action_type = wrapped_function.__name__
+        action_type = "{}.{}".format(
+            wrapped_function.__module__, wrapped_function.__qualname__
+        )
 
-    if PY3 and include_args is not None:
+    if include_args is not None:
         from inspect import signature
 
         sig = signature(wrapped_function)

eliot/_errors.py

@@ -2,8 +2,6 @@
 Error-handling utility code.
 """
 
-from __future__ import unicode_literals
-
 from inspect import getmro
 
 

eliot/_generators.py

@@ -2,8 +2,6 @@
 Support for maintaining an action context across generator suspension.
 """
 
-from __future__ import unicode_literals, absolute_import
-
 from sys import exc_info
 from functools import wraps
 from contextlib import contextmanager

eliot/_message.py

@@ -2,11 +2,8 @@
 Log messages and related utilities.
 """
 
-from __future__ import unicode_literals
-
 import time
 from warnings import warn
-from six import text_type as unicode
 
 from pyrsistent import PClass, pmap_field
 
@@ -74,7 +71,7 @@ def __init__(self, contents, serializer=None):
         You can also use L{Message.new} to create L{Message} objects.
 
         @param contents: The contents of this L{Message}, a C{dict} whose keys
-           must be C{unicode}, or text that has been UTF-8 encoded to
+           must be C{str}, or text that has been UTF-8 encoded to
            C{bytes}.
 
         @param serializer: Either C{None}, or
@@ -141,7 +138,7 @@ class WrittenMessage(PClass):
     @ivar _logged_dict: The originally logged dictionary.
     """
 
-    _logged_dict = pmap_field((str, unicode), object)
+    _logged_dict = pmap_field((str, str), object)
 
     @property
     def timestamp(self):

eliot/_output.py

@@ -182,7 +182,7 @@ def _safe_unicode_dictionary(dictionary):
 
     @param dictionary: A L{dict} to serialize.
 
-    @return: A L{unicode} string representing the input dictionary as
+    @return: A L{str} string representing the input dictionary as
         faithfully as can be done without putting in too much effort.
     """
     try:

eliot/_traceback.py

@@ -3,8 +3,6 @@
 as well as common utilities for handling exception logging.
 """
 
-from __future__ import unicode_literals
-
 import traceback
 import sys
 

eliot/_util.py

@@ -2,44 +2,39 @@
 Utilities that don't go anywhere else.
 """
 
-from __future__ import unicode_literals
-
-import sys
 from types import ModuleType
 
-from six import exec_, text_type as unicode, PY3
-
 
 def safeunicode(o):
     """
-    Like C{unicode()}, but catches and swallows any raised exceptions.
+    Like C{str()}, but catches and swallows any raised exceptions.
 
     @param o: An object of some sort.
 
-    @return: C{unicode(o)}, or an error message if that failed.
-    @rtype: C{unicode}
+    @return: C{str(o)}, or an error message if that failed.
+    @rtype: C{str}
     """
     try:
-        return unicode(o)
+        return str(o)
     except:
         # Not much we can do about this...
-        return "eliot: unknown, unicode() raised exception"
+        return "eliot: unknown, str() raised exception"
 
 
 def saferepr(o):
     """
-    Like C{unicode(repr())}, but catches and swallows any raised exceptions.
+    Like C{str(repr())}, but catches and swallows any raised exceptions.
 
     @param o: An object of some sort.
 
-    @return: C{unicode(repr(o))}, or an error message if that failed.
-    @rtype: C{unicode}
+    @return: C{str(repr(o))}, or an error message if that failed.
+    @rtype: C{str}
     """
     try:
-        return unicode(repr(o))
+        return str(repr(o))
     except:
         # Not much we can do about this...
-        return "eliot: unknown, unicode() raised exception"
+        return "eliot: unknown, str() raised exception"
 
 
 def load_module(name, original_module):
@@ -52,19 +47,10 @@ def load_module(name, original_module):
 
     @return: A new, distinct module.
     """
-    module = ModuleType(name)
-    if PY3:
-        import importlib.util
+    import importlib.util
 
-        spec = importlib.util.find_spec(original_module.__name__)
-        source = spec.loader.get_code(original_module.__name__)
-    else:
-        if getattr(sys, "frozen", False):
-            raise NotImplementedError("Can't load modules on Python 2 with PyInstaller")
-        path = original_module.__file__
-        if path.endswith(".pyc") or path.endswith(".pyo"):
-            path = path[:-1]
-        with open(path) as f:
-            source = f.read()
-    exec_(source, module.__dict__, module.__dict__)
+    module = ModuleType(name)
+    spec = importlib.util.find_spec(original_module.__name__)
+    source = spec.loader.get_code(original_module.__name__)
+    exec(source, module.__dict__, module.__dict__)
     return module

eliot/_validation.py

@@ -5,14 +5,8 @@
 although in theory it could be done then as well.
 """
 
-from __future__ import unicode_literals
-
 from warnings import warn
 
-import six
-
-unicode = six.text_type
-
 from pyrsistent import PClass, field as pyrsistent_field
 
 from ._message import (
@@ -42,8 +36,8 @@ class ValidationError(Exception):
 
 
 # Types that can be encoded to JSON:
-_JSON_TYPES = {type(None), int, float, unicode, list, dict, bytes, bool}
-_JSON_TYPES |= set(six.integer_types)
+_JSON_TYPES = {type(None), int, float, str, list, dict, bytes, bool}
+_JSON_TYPES |= set((int,))
 
 RESERVED_FIELDS = (TASK_LEVEL_FIELD, TASK_UUID_FIELD, TIMESTAMP_FIELD)
 
@@ -60,7 +54,7 @@ class Field(object):
         e.g. C{"path"}.
 
     @ivar description: A description of what this field contains.
-    @type description: C{unicode}
+    @type description: C{str}
     """
 
     def __init__(self, key, serializer, description="", extraValidator=None):
@@ -116,7 +110,7 @@ def forValue(klass, key, value, description):
         @param value: The allowed value for the field.
 
         @param description: A description of what this field contains.
-        @type description: C{unicode}
+        @type description: C{str}
 
         @return: A L{Field}.
         """
@@ -139,12 +133,12 @@ def forTypes(klass, key, classes, description, extraValidator=None):
             e.g. C{"path"}.
 
         @ivar classes: A C{list} of allowed Python classes for this field's
-            values. Supported classes are C{unicode}, C{int}, C{float},
+            values. Supported classes are C{str}, C{int}, C{float},
             C{bool}, C{long}, C{list} and C{dict} and C{None} (the latter
             isn't strictly a class, but will be converted appropriately).
 
         @param description: A description of what this field contains.
-        @type description: C{unicode}
+        @type description: C{str}
 
         @param extraValidator: See description in L{Field.__init__}.
 
@@ -189,16 +183,16 @@ def fields(*fields, **keys):
     ]
 
 
-REASON = Field.forTypes(REASON_FIELD, [unicode], "The reason for an event.")
-TRACEBACK = Field.forTypes("traceback", [unicode], "The traceback for an exception.")
-EXCEPTION = Field.forTypes("exception", [unicode], "The FQPN of an exception class.")
+REASON = Field.forTypes(REASON_FIELD, [str], "The reason for an event.")
+TRACEBACK = Field.forTypes("traceback", [str], "The traceback for an exception.")
+EXCEPTION = Field.forTypes("exception", [str], "The FQPN of an exception class.")
 
 
 class _MessageSerializer(object):
     """
     A serializer and validator for messages.
 
-    @ivar fields: A C{dict} mapping a C{unicode} field name to the respective
+    @ivar fields: A C{dict} mapping a C{str} field name to the respective
         L{Field}.
     @ivar allow_additional_fields: If true, additional fields don't cause
         validation failure.
@@ -300,7 +294,7 @@ def setstatus(key, status):
         e.g. C{"yourapp:subsystem:yourtype"}.
 
     @ivar description: A description of what this message means.
-    @type description: C{unicode}
+    @type description: C{str}
     """
 
     def __init__(self, message_type, fields, description=""):
@@ -312,7 +306,7 @@ def __init__(self, message_type, fields, description=""):
             type.
 
         @param description: A description of what this message means.
-        @type description: C{unicode}
+        @type description: C{str}
         """
         self.message_type = message_type
         self.description = description
@@ -395,7 +389,7 @@ def dosomething(key):
         C{"exception"} and C{"reason"} fields).
 
     @ivar description: A description of what this action's messages mean.
-    @type description: C{unicode}
+    @type description: C{str}
     """
 
     # Overrideable hook for testing; need staticmethod() so functions don't

eliot/parse.py

@@ -3,10 +3,6 @@
 ``WrittenAction`` and ``WrittenMessage`` objects.
 """
 
-from __future__ import unicode_literals
-
-from six import text_type as unicode
-
 from pyrsistent import PClass, pmap_field, pset_field, discard
 
 from ._message import WrittenMessage, TASK_UUID_FIELD
@@ -141,7 +137,7 @@ class Parser(PClass):
     @ivar _tasks: Map from UUID to corresponding L{Task}.
     """
 
-    _tasks = pmap_field(unicode, Task)
+    _tasks = pmap_field(str, Task)
 
     def add(self, message_dict):
         """

eliot/serializers.py

@@ -2,8 +2,6 @@
 Standardized serialization code.
 """
 
-from __future__ import unicode_literals
-
 from hashlib import md5
 
 _TIME_FORMAT = "%Y-%m-%dT%H:%M:%S.%fZ"

eliot/tai64n.py

@@ -6,8 +6,6 @@
 @see: U{http://cr.yp.to/libtai/tai64.html}.
 """
 
-from __future__ import unicode_literals
-
 import struct
 from binascii import b2a_hex, a2b_hex