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"""Utilities for writing code that runs on Python 2 and 3""" 

 

#Copyright (c) 2010-2011 Benjamin Peterson 

 

#Permission is hereby granted, free of charge, to any person obtaining a copy of 

#this software and associated documentation files (the "Software"), to deal in 

#the Software without restriction, including without limitation the rights to 

#use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of 

#the Software, and to permit persons to whom the Software is furnished to do so, 

#subject to the following conditions: 

 

#The above copyright notice and this permission notice shall be included in all 

#copies or substantial portions of the Software. 

 

#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 

#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS 

#FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR 

#COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 

#IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 

#CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

 

import operator 

import sys 

import types 

 

__author__ = "Benjamin Peterson <benjamin@python.org>" 

__version__ = "1.2.0"  # Revision 41c74fef2ded 

 

 

# True if we are running on Python 3. 

PY3 = sys.version_info[0] == 3 

 

if PY3: 

    string_types = str, 

    integer_types = int, 

    class_types = type, 

    text_type = str 

    binary_type = bytes 

 

    MAXSIZE = sys.maxsize 

else: 

    string_types = basestring, 

    integer_types = (int, long) 

    class_types = (type, types.ClassType) 

    text_type = unicode 

    binary_type = str 

 

    if sys.platform.startswith("java"): 

        # Jython always uses 32 bits. 

        MAXSIZE = int((1 << 31) - 1) 

    else: 

        # It's possible to have sizeof(long) != sizeof(Py_ssize_t). 

        class X(object): 

            def __len__(self): 

                return 1 << 31 

        try: 

            len(X()) 

        except OverflowError: 

            # 32-bit 

            MAXSIZE = int((1 << 31) - 1) 

        else: 

            # 64-bit 

            MAXSIZE = int((1 << 63) - 1) 

            del X 

 

 

def _add_doc(func, doc): 

    """Add documentation to a function.""" 

    func.__doc__ = doc 

 

 

def _import_module(name): 

    """Import module, returning the module after the last dot.""" 

    __import__(name) 

    return sys.modules[name] 

 

 

class _LazyDescr(object): 

 

    def __init__(self, name): 

        self.name = name 

 

    def __get__(self, obj, tp): 

        result = self._resolve() 

        setattr(obj, self.name, result) 

        # This is a bit ugly, but it avoids running this again. 

        delattr(tp, self.name) 

        return result 

 

 

class MovedModule(_LazyDescr): 

 

    def __init__(self, name, old, new=None): 

        super(MovedModule, self).__init__(name) 

        if PY3: 

            if new is None: 

                new = name 

            self.mod = new 

        else: 

            self.mod = old 

 

    def _resolve(self): 

        return _import_module(self.mod) 

 

 

class MovedAttribute(_LazyDescr): 

 

    def __init__(self, name, old_mod, new_mod, old_attr=None, new_attr=None): 

        super(MovedAttribute, self).__init__(name) 

        if PY3: 

            if new_mod is None: 

                new_mod = name 

            self.mod = new_mod 

            if new_attr is None: 

                if old_attr is None: 

                    new_attr = name 

                else: 

                    new_attr = old_attr 

            self.attr = new_attr 

        else: 

            self.mod = old_mod 

            if old_attr is None: 

                old_attr = name 

            self.attr = old_attr 

 

    def _resolve(self): 

        module = _import_module(self.mod) 

        return getattr(module, self.attr) 

 

 

 

class _MovedItems(types.ModuleType): 

    """Lazy loading of moved objects""" 

 

 

_moved_attributes = [ 

    MovedAttribute("cStringIO", "cStringIO", "io", "StringIO"), 

    MovedAttribute("filter", "itertools", "builtins", "ifilter", "filter"), 

    MovedAttribute("input", "__builtin__", "builtins", "raw_input", "input"), 

    MovedAttribute("map", "itertools", "builtins", "imap", "map"), 

    MovedAttribute("reload_module", "__builtin__", "imp", "reload"), 

    MovedAttribute("reduce", "__builtin__", "functools"), 

    MovedAttribute("StringIO", "StringIO", "io"), 

    MovedAttribute("xrange", "__builtin__", "builtins", "xrange", "range"), 

    MovedAttribute("zip", "itertools", "builtins", "izip", "zip"), 

 

    MovedModule("builtins", "__builtin__"), 

    MovedModule("configparser", "ConfigParser"), 

    MovedModule("copyreg", "copy_reg"), 

    MovedModule("http_cookiejar", "cookielib", "http.cookiejar"), 

    MovedModule("http_cookies", "Cookie", "http.cookies"), 

    MovedModule("html_entities", "htmlentitydefs", "html.entities"), 

    MovedModule("html_parser", "HTMLParser", "html.parser"), 

    MovedModule("http_client", "httplib", "http.client"), 

    MovedModule("BaseHTTPServer", "BaseHTTPServer", "http.server"), 

    MovedModule("CGIHTTPServer", "CGIHTTPServer", "http.server"), 

    MovedModule("SimpleHTTPServer", "SimpleHTTPServer", "http.server"), 

    MovedModule("cPickle", "cPickle", "pickle"), 

    MovedModule("queue", "Queue"), 

    MovedModule("reprlib", "repr"), 

    MovedModule("socketserver", "SocketServer"), 

    MovedModule("tkinter", "Tkinter"), 

    MovedModule("tkinter_dialog", "Dialog", "tkinter.dialog"), 

    MovedModule("tkinter_filedialog", "FileDialog", "tkinter.filedialog"), 

    MovedModule("tkinter_scrolledtext", "ScrolledText", "tkinter.scrolledtext"), 

    MovedModule("tkinter_simpledialog", "SimpleDialog", "tkinter.simpledialog"), 

    MovedModule("tkinter_tix", "Tix", "tkinter.tix"), 

    MovedModule("tkinter_constants", "Tkconstants", "tkinter.constants"), 

    MovedModule("tkinter_dnd", "Tkdnd", "tkinter.dnd"), 

    MovedModule("tkinter_colorchooser", "tkColorChooser", 

                "tkinter.colorchooser"), 

    MovedModule("tkinter_commondialog", "tkCommonDialog", 

                "tkinter.commondialog"), 

    MovedModule("tkinter_tkfiledialog", "tkFileDialog", "tkinter.filedialog"), 

    MovedModule("tkinter_font", "tkFont", "tkinter.font"), 

    MovedModule("tkinter_messagebox", "tkMessageBox", "tkinter.messagebox"), 

    MovedModule("tkinter_tksimpledialog", "tkSimpleDialog", 

                "tkinter.simpledialog"), 

    MovedModule("urllib_robotparser", "robotparser", "urllib.robotparser"), 

    MovedModule("winreg", "_winreg"), 

] 

for attr in _moved_attributes: 

    setattr(_MovedItems, attr.name, attr) 

del attr 

 

moves = sys.modules[__name__ + ".moves"] = _MovedItems("moves") 

 

 

def add_move(move): 

    """Add an item to six.moves.""" 

    setattr(_MovedItems, move.name, move) 

 

 

def remove_move(name): 

    """Remove item from six.moves.""" 

    try: 

        delattr(_MovedItems, name) 

    except AttributeError: 

        try: 

            del moves.__dict__[name] 

        except KeyError: 

            raise AttributeError("no such move, %r" % (name,)) 

 

 

if PY3: 

    _meth_func = "__func__" 

    _meth_self = "__self__" 

 

    _func_code = "__code__" 

    _func_defaults = "__defaults__" 

 

    _iterkeys = "keys" 

    _itervalues = "values" 

    _iteritems = "items" 

else: 

    _meth_func = "im_func" 

    _meth_self = "im_self" 

 

    _func_code = "func_code" 

    _func_defaults = "func_defaults" 

 

    _iterkeys = "iterkeys" 

    _itervalues = "itervalues" 

    _iteritems = "iteritems" 

 

 

try: 

    advance_iterator = next 

except NameError: 

    def advance_iterator(it): 

        return it.next() 

next = advance_iterator 

 

 

if PY3: 

    def get_unbound_function(unbound): 

        return unbound 

 

    Iterator = object 

 

    def callable(obj): 

        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__) 

else: 

    def get_unbound_function(unbound): 

        return unbound.im_func 

 

    class Iterator(object): 

 

        def next(self): 

            return type(self).__next__(self) 

 

    callable = callable 

_add_doc(get_unbound_function, 

         """Get the function out of a possibly unbound function""") 

 

 

get_method_function = operator.attrgetter(_meth_func) 

get_method_self = operator.attrgetter(_meth_self) 

get_function_code = operator.attrgetter(_func_code) 

get_function_defaults = operator.attrgetter(_func_defaults) 

 

 

def iterkeys(d): 

    """Return an iterator over the keys of a dictionary.""" 

    return iter(getattr(d, _iterkeys)()) 

 

def itervalues(d): 

    """Return an iterator over the values of a dictionary.""" 

    return iter(getattr(d, _itervalues)()) 

 

def iteritems(d): 

    """Return an iterator over the (key, value) pairs of a dictionary.""" 

    return iter(getattr(d, _iteritems)()) 

 

 

if PY3: 

    def b(s): 

        return s.encode("latin-1") 

    def u(s): 

        return s 

    if sys.version_info[1] <= 1: 

        def int2byte(i): 

            return bytes((i,)) 

    else: 

        # This is about 2x faster than the implementation above on 3.2+ 

        int2byte = operator.methodcaller("to_bytes", 1, "big") 

    import io 

    StringIO = io.StringIO 

    BytesIO = io.BytesIO 

else: 

    def b(s): 

        return s 

    def u(s): 

        return unicode(s, "unicode_escape") 

    int2byte = chr 

    import StringIO 

    StringIO = BytesIO = StringIO.StringIO 

_add_doc(b, """Byte literal""") 

_add_doc(u, """Text literal""") 

 

 

if PY3: 

    import builtins 

    exec_ = getattr(builtins, "exec") 

 

 

    def reraise(tp, value, tb=None): 

        if value.__traceback__ is not tb: 

            raise value.with_traceback(tb) 

        raise value 

 

 

    print_ = getattr(builtins, "print") 

    del builtins 

 

else: 

    def exec_(code, globs=None, locs=None): 

        """Execute code in a namespace.""" 

        if globs is None: 

            frame = sys._getframe(1) 

            globs = frame.f_globals 

            if locs is None: 

                locs = frame.f_locals 

            del frame 

        elif locs is None: 

            locs = globs 

        exec("""exec code in globs, locs""") 

 

 

    exec_("""def reraise(tp, value, tb=None): 

    raise tp, value, tb 

""") 

 

 

    def print_(*args, **kwargs): 

        """The new-style print function.""" 

        fp = kwargs.pop("file", sys.stdout) 

        if fp is None: 

            return 

        def write(data): 

            if not isinstance(data, basestring): 

                data = str(data) 

            fp.write(data) 

        want_unicode = False 

        sep = kwargs.pop("sep", None) 

        if sep is not None: 

            if isinstance(sep, unicode): 

                want_unicode = True 

            elif not isinstance(sep, str): 

                raise TypeError("sep must be None or a string") 

        end = kwargs.pop("end", None) 

        if end is not None: 

            if isinstance(end, unicode): 

                want_unicode = True 

            elif not isinstance(end, str): 

                raise TypeError("end must be None or a string") 

        if kwargs: 

            raise TypeError("invalid keyword arguments to print()") 

        if not want_unicode: 

            for arg in args: 

                if isinstance(arg, unicode): 

                    want_unicode = True 

                    break 

        if want_unicode: 

            newline = unicode("\n") 

            space = unicode(" ") 

        else: 

            newline = "\n" 

            space = " " 

        if sep is None: 

            sep = space 

        if end is None: 

            end = newline 

        for i, arg in enumerate(args): 

            if i: 

                write(sep) 

            write(arg) 

        write(end) 

 

_add_doc(reraise, """Reraise an exception.""") 

 

 

def with_metaclass(meta, base=object): 

    """Create a base class with a metaclass.""" 

    return meta("NewBase", (base,), {})