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compat.py
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# util/compat.py # Copyright (C) 2005-2021 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php """Handle Python version/platform incompatibilities.""" import collections import contextlib import inspect import operator import platform import sys py36 = sys.version_info >= (3, 6) py33 = sys.version_info >= (3, 3) py35 = sys.version_info >= (3, 5) py32 = sys.version_info >= (3, 2) py3k = sys.version_info >= (3, 0) py2k = sys.version_info < (3, 0) py265 = sys.version_info >= (2, 6, 5) jython = sys.platform.startswith("java") pypy = hasattr(sys, "pypy_version_info") win32 = sys.platform.startswith("win") osx = sys.platform.startswith("darwin") cpython = not pypy and not jython # TODO: something better for this ? arm = "aarch" in platform.machine().lower() contextmanager = contextlib.contextmanager dottedgetter = operator.attrgetter namedtuple = collections.namedtuple next = next # noqa FullArgSpec = collections.namedtuple( "FullArgSpec", [ "args", "varargs", "varkw", "defaults", "kwonlyargs", "kwonlydefaults", "annotations", ], ) try: import threading except ImportError: import dummy_threading as threading # noqa # work around http://bugs.python.org/issue2646 if py265: safe_kwarg = lambda arg: arg # noqa else: safe_kwarg = str def inspect_getfullargspec(func): """Fully vendored version of getfullargspec from Python 3.3.""" if inspect.ismethod(func): func = func.__func__ if not inspect.isfunction(func): raise TypeError("{!r} is not a Python function".format(func)) co = func.__code__ if not inspect.iscode(co): raise TypeError("{!r} is not a code object".format(co)) nargs = co.co_argcount names = co.co_varnames nkwargs = co.co_kwonlyargcount if py3k else 0 args = list(names[:nargs]) kwonlyargs = list(names[nargs : nargs + nkwargs]) nargs += nkwargs varargs = None if co.co_flags & inspect.CO_VARARGS: varargs = co.co_varnames[nargs] nargs = nargs + 1 varkw = None if co.co_flags & inspect.CO_VARKEYWORDS: varkw = co.co_varnames[nargs] return FullArgSpec( args, varargs, varkw, func.__defaults__, kwonlyargs, func.__kwdefaults__ if py3k else None, func.__annotations__ if py3k else {}, ) if py3k: import base64 import builtins import configparser import itertools import pickle from functools import reduce from io import BytesIO as byte_buffer from io import StringIO from itertools import zip_longest from urllib.parse import ( quote_plus, unquote_plus, parse_qsl, quote, unquote, ) string_types = (str,) binary_types = (bytes,) binary_type = bytes text_type = str int_types = (int,) iterbytes = iter itertools_filterfalse = itertools.filterfalse itertools_filter = filter itertools_imap = map exec_ = getattr(builtins, "exec") import_ = getattr(builtins, "__import__") print_ = getattr(builtins, "print") def b(s): return s.encode("latin-1") def b64decode(x): return base64.b64decode(x.encode("ascii")) def b64encode(x): return base64.b64encode(x).decode("ascii") def decode_backslashreplace(text, encoding): return text.decode(encoding, errors="backslashreplace") def cmp(a, b): return (a > b) - (a < b) def raise_( exception, with_traceback=None, replace_context=None, from_=False ): r"""implement "raise" with cause support. :param exception: exception to raise :param with_traceback: will call exception.with_traceback() :param replace_context: an as-yet-unsupported feature. This is an exception object which we are "replacing", e.g., it's our "cause" but we don't want it printed. Basically just what ``__suppress_context__`` does but we don't want to suppress the enclosing context, if any. So for now we make it the cause. :param from\_: the cause. this actually sets the cause and doesn't hope to hide it someday. """ if with_traceback is not None: exception = exception.with_traceback(with_traceback) if from_ is not False: exception.__cause__ = from_ elif replace_context is not None: # no good solution here, we would like to have the exception # have only the context of replace_context.__context__ so that the # intermediary exception does not change, but we can't figure # that out. exception.__cause__ = replace_context try: raise exception finally: # credit to # https://cosmicpercolator.com/2016/01/13/exception-leaks-in-python-2-and-3/ # as the __traceback__ object creates a cycle del exception, replace_context, from_, with_traceback from typing import TYPE_CHECKING def u(s): return s def ue(s): return s if py32: callable = callable # noqa else: def callable(fn): # noqa return hasattr(fn, "__call__") else: import base64 import ConfigParser as configparser # noqa import itertools from StringIO import StringIO # noqa from cStringIO import StringIO as byte_buffer # noqa from itertools import izip_longest as zip_longest # noqa from urllib import quote # noqa from urllib import quote_plus # noqa from urllib import unquote # noqa from urllib import unquote_plus # noqa from urlparse import parse_qsl # noqa try: import cPickle as pickle except ImportError: import pickle # noqa string_types = (basestring,) # noqa binary_types = (bytes,) binary_type = str text_type = unicode # noqa int_types = int, long # noqa callable = callable # noqa cmp = cmp # noqa reduce = reduce # noqa b64encode = base64.b64encode b64decode = base64.b64decode itertools_filterfalse = itertools.ifilterfalse itertools_filter = itertools.ifilter itertools_imap = itertools.imap def b(s): return s def exec_(func_text, globals_, lcl=None): if lcl is None: exec("exec func_text in globals_") else: exec("exec func_text in globals_, lcl") def iterbytes(buf): return (ord(byte) for byte in buf) def import_(*args): if len(args) == 4: args = args[0:3] + ([str(arg) for arg in args[3]],) return __import__(*args) def print_(*args, **kwargs): fp = kwargs.pop("file", sys.stdout) if fp is None: return for arg in enumerate(args): if not isinstance(arg, basestring): # noqa arg = str(arg) fp.write(arg) def u(s): # this differs from what six does, which doesn't support non-ASCII # strings - we only use u() with # literal source strings, and all our source files with non-ascii # in them (all are tests) are utf-8 encoded. return unicode(s, "utf-8") # noqa def ue(s): return unicode(s, "unicode_escape") # noqa def decode_backslashreplace(text, encoding): try: return text.decode(encoding) except UnicodeDecodeError: # regular "backslashreplace" for an incompatible encoding raises: # "TypeError: don't know how to handle UnicodeDecodeError in # error callback" return repr(text)[1:-1].decode() def safe_bytestring(text): # py2k only if not isinstance(text, string_types): return unicode(text).encode("ascii", errors="backslashreplace") elif isinstance(text, unicode): return text.encode("ascii", errors="backslashreplace") else: return text exec( "def raise_(exception, with_traceback=None, replace_context=None, " "from_=False):\n" " if with_traceback:\n" " raise type(exception), exception, with_traceback\n" " else:\n" " raise exception\n" ) TYPE_CHECKING = False if py35: def _formatannotation(annotation, base_module=None): """vendored from python 3.7""" if getattr(annotation, "__module__", None) == "typing": return repr(annotation).replace("typing.", "") if isinstance(annotation, type): if annotation.__module__ in ("builtins", base_module): return annotation.__qualname__ return annotation.__module__ + "." + annotation.__qualname__ return repr(annotation) def inspect_formatargspec( args, varargs=None, varkw=None, defaults=None, kwonlyargs=(), kwonlydefaults={}, annotations={}, formatarg=str, formatvarargs=lambda name: "*" + name, formatvarkw=lambda name: "**" + name, formatvalue=lambda value: "=" + repr(value), formatreturns=lambda text: " -> " + text, formatannotation=_formatannotation, ): """Copy formatargspec from python 3.7 standard library. Python 3 has deprecated formatargspec and requested that Signature be used instead, however this requires a full reimplementation of formatargspec() in terms of creating Parameter objects and such. Instead of introducing all the object-creation overhead and having to reinvent from scratch, just copy their compatibility routine. Utimately we would need to rewrite our "decorator" routine completely which is not really worth it right now, until all Python 2.x support is dropped. """ def formatargandannotation(arg): result = formatarg(arg) if arg in annotations: result += ": " + formatannotation(annotations[arg]) return result specs = [] if defaults: firstdefault = len(args) - len(defaults) for i, arg in enumerate(args): spec = formatargandannotation(arg) if defaults and i >= firstdefault: spec = spec + formatvalue(defaults[i - firstdefault]) specs.append(spec) if varargs is not None: specs.append(formatvarargs(formatargandannotation(varargs))) else: if kwonlyargs: specs.append("*") if kwonlyargs: for kwonlyarg in kwonlyargs: spec = formatargandannotation(kwonlyarg) if kwonlydefaults and kwonlyarg in kwonlydefaults: spec += formatvalue(kwonlydefaults[kwonlyarg]) specs.append(spec) if varkw is not None: specs.append(formatvarkw(formatargandannotation(varkw))) result = "(" + ", ".join(specs) + ")" if "return" in annotations: result += formatreturns(formatannotation(annotations["return"])) return result elif py2k: from inspect import formatargspec as _inspect_formatargspec def inspect_formatargspec(*spec, **kw): # convert for a potential FullArgSpec from compat.getfullargspec() return _inspect_formatargspec(*spec[0:4], **kw) # noqa else: from inspect import formatargspec as inspect_formatargspec # noqa # Fix deprecation of accessing ABCs straight from collections module # (which will stop working in 3.8). if py33: import collections.abc as collections_abc else: import collections as collections_abc # noqa @contextlib.contextmanager def nested(*managers): """Implement contextlib.nested, mostly for unit tests. As tests still need to run on py2.6 we can't use multiple-with yet. Function is removed in py3k but also emits deprecation warning in 2.7 so just roll it here for everyone. """ exits = [] vars_ = [] exc = (None, None, None) try: for mgr in managers: exit_ = mgr.__exit__ enter = mgr.__enter__ vars_.append(enter()) exits.append(exit_) yield vars_ except: exc = sys.exc_info() finally: while exits: exit_ = exits.pop() # noqa try: if exit_(*exc): exc = (None, None, None) except: exc = sys.exc_info() if exc != (None, None, None): reraise(exc[0], exc[1], exc[2]) def raise_from_cause(exception, exc_info=None): r"""legacy. use raise\_()""" if exc_info is None: exc_info = sys.exc_info() exc_type, exc_value, exc_tb = exc_info cause = exc_value if exc_value is not exception else None reraise(type(exception), exception, tb=exc_tb, cause=cause) def reraise(tp, value, tb=None, cause=None): r"""legacy. use raise\_()""" raise_(value, with_traceback=tb, from_=cause) def with_metaclass(meta, *bases): """Create a base class with a metaclass. Drops the middle class upon creation. Source: http://lucumr.pocoo.org/2013/5/21/porting-to-python-3-redux/ """ class metaclass(meta): __call__ = type.__call__ __init__ = type.__init__ def __new__(cls, name, this_bases, d): if this_bases is None: return type.__new__(cls, name, (), d) return meta(name, bases, d) return metaclass("temporary_class", None, {}) if py3k: from datetime import timezone else: from datetime import datetime from datetime import timedelta from datetime import tzinfo class timezone(tzinfo): """Minimal port of python 3 timezone object""" __slots__ = "_offset" def __init__(self, offset): if not isinstance(offset, timedelta): raise TypeError("offset must be a timedelta") if not self._minoffset <= offset <= self._maxoffset: raise ValueError( "offset must be a timedelta " "strictly between -timedelta(hours=24) and " "timedelta(hours=24)." ) self._offset = offset def __eq__(self, other): if type(other) != timezone: return False return self._offset == other._offset def __hash__(self): return hash(self._offset) def __repr__(self): return "sqlalchemy.util.%s(%r)" % ( self.__class__.__name__, self._offset, ) def __str__(self): return self.tzname(None) def utcoffset(self, dt): return self._offset def tzname(self, dt): return self._name_from_offset(self._offset) def dst(self, dt): return None def fromutc(self, dt): if isinstance(dt, datetime): if dt.tzinfo is not self: raise ValueError("fromutc: dt.tzinfo " "is not self") return dt + self._offset raise TypeError( "fromutc() argument must be a datetime instance" " or None" ) @staticmethod def _timedelta_to_microseconds(timedelta): """backport of timedelta._to_microseconds()""" return ( timedelta.days * (24 * 3600) + timedelta.seconds ) * 1000000 + timedelta.microseconds @staticmethod def _divmod_timedeltas(a, b): """backport of timedelta.__divmod__""" q, r = divmod( timezone._timedelta_to_microseconds(a), timezone._timedelta_to_microseconds(b), ) return q, timedelta(0, 0, r) @staticmethod def _name_from_offset(delta): if not delta: return "UTC" if delta < timedelta(0): sign = "-" delta = -delta else: sign = "+" hours, rest = timezone._divmod_timedeltas( delta, timedelta(hours=1) ) minutes, rest = timezone._divmod_timedeltas( rest, timedelta(minutes=1) ) result = "UTC%s%02d:%02d" % (sign, hours, minutes) if rest.seconds: result += ":%02d" % (rest.seconds,) if rest.microseconds: result += ".%06d" % (rest.microseconds,) return result _maxoffset = timedelta(hours=23, minutes=59) _minoffset = -_maxoffset timezone.utc = timezone(timedelta(0))