--- a/env/lib/python3.7/site-packages/boltons/namedutils.py	Thu May 14 16:47:39 2020 -0400
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,369 +0,0 @@
-# -*- coding: utf-8 -*-
-"""\
-The ``namedutils`` module defines two lightweight container types:
-:class:`namedtuple` and :class:`namedlist`. Both are subtypes of built-in
-sequence types, which are very fast and efficient. They simply add
-named attribute accessors for specific indexes within themselves.
-
-The :class:`namedtuple` is identical to the built-in
-:class:`collections.namedtuple`, with a couple of enhancements,
-including a ``__repr__`` more suitable to inheritance.
-
-The :class:`namedlist` is the mutable counterpart to the
-:class:`namedtuple`, and is much faster and lighter-weight than
-full-blown :class:`object`. Consider this if you're implementing nodes
-in a tree, graph, or other mutable data structure. If you want an even
-skinnier approach, you'll probably have to look to C.
-"""
-
-from __future__ import print_function
-
-import sys as _sys
-try:
-    from collections import OrderedDict
-except ImportError:
-    # backwards compatibility (2.6 has no OrderedDict)
-    OrderedDict = dict
-from keyword import iskeyword as _iskeyword
-from operator import itemgetter as _itemgetter
-
-try:
-    basestring
-    def exec_(code, global_env):
-        exec("exec code in global_env")
-except NameError:
-    basestring = (str, bytes)  # Python 3 compat
-    def exec_(code, global_env):
-        exec(code, global_env)
-
-__all__ = ['namedlist', 'namedtuple']
-
-# Tiny templates
-
-_repr_tmpl = '{name}=%r'
-
-_imm_field_tmpl = '''\
-    {name} = _property(_itemgetter({index:d}), doc='Alias for field {index:d}')
-'''
-
-_m_field_tmpl = '''\
-    {name} = _property(_itemgetter({index:d}), _itemsetter({index:d}), doc='Alias for field {index:d}')
-'''
-
-#################################################################
-### namedtuple
-#################################################################
-
-_namedtuple_tmpl = '''\
-class {typename}(tuple):
-    '{typename}({arg_list})'
-
-    __slots__ = ()
-
-    _fields = {field_names!r}
-
-    def __new__(_cls, {arg_list}):  # TODO: tweak sig to make more extensible
-        'Create new instance of {typename}({arg_list})'
-        return _tuple.__new__(_cls, ({arg_list}))
-
-    @classmethod
-    def _make(cls, iterable, new=_tuple.__new__, len=len):
-        'Make a new {typename} object from a sequence or iterable'
-        result = new(cls, iterable)
-        if len(result) != {num_fields:d}:
-            raise TypeError('Expected {num_fields:d}'
-                            ' arguments, got %d' % len(result))
-        return result
-
-    def __repr__(self):
-        'Return a nicely formatted representation string'
-        tmpl = self.__class__.__name__ + '({repr_fmt})'
-        return tmpl % self
-
-    def _asdict(self):
-        'Return a new OrderedDict which maps field names to their values'
-        return OrderedDict(zip(self._fields, self))
-
-    def _replace(_self, **kwds):
-        'Return a new {typename} object replacing field(s) with new values'
-        result = _self._make(map(kwds.pop, {field_names!r}, _self))
-        if kwds:
-            raise ValueError('Got unexpected field names: %r' % kwds.keys())
-        return result
-
-    def __getnewargs__(self):
-        'Return self as a plain tuple.  Used by copy and pickle.'
-        return tuple(self)
-
-    __dict__ = _property(_asdict)
-
-    def __getstate__(self):
-        'Exclude the OrderedDict from pickling'  # wat
-        pass
-
-{field_defs}
-'''
-
-def namedtuple(typename, field_names, verbose=False, rename=False):
-    """Returns a new subclass of tuple with named fields.
-
-    >>> Point = namedtuple('Point', ['x', 'y'])
-    >>> Point.__doc__                   # docstring for the new class
-    'Point(x, y)'
-    >>> p = Point(11, y=22)             # instantiate with pos args or keywords
-    >>> p[0] + p[1]                     # indexable like a plain tuple
-    33
-    >>> x, y = p                        # unpack like a regular tuple
-    >>> x, y
-    (11, 22)
-    >>> p.x + p.y                       # fields also accessible by name
-    33
-    >>> d = p._asdict()                 # convert to a dictionary
-    >>> d['x']
-    11
-    >>> Point(**d)                      # convert from a dictionary
-    Point(x=11, y=22)
-    >>> p._replace(x=100)               # _replace() is like str.replace() but targets named fields
-    Point(x=100, y=22)
-    """
-
-    # Validate the field names.  At the user's option, either generate an error
-    # message or automatically replace the field name with a valid name.
-    if isinstance(field_names, basestring):
-        field_names = field_names.replace(',', ' ').split()
-    field_names = [str(x) for x in field_names]
-    if rename:
-        seen = set()
-        for index, name in enumerate(field_names):
-            if (not all(c.isalnum() or c == '_' for c in name)
-                or _iskeyword(name)
-                or not name
-                or name[0].isdigit()
-                or name.startswith('_')
-                or name in seen):
-                field_names[index] = '_%d' % index
-            seen.add(name)
-    for name in [typename] + field_names:
-        if not all(c.isalnum() or c == '_' for c in name):
-            raise ValueError('Type names and field names can only contain '
-                             'alphanumeric characters and underscores: %r'
-                             % name)
-        if _iskeyword(name):
-            raise ValueError('Type names and field names cannot be a '
-                             'keyword: %r' % name)
-        if name[0].isdigit():
-            raise ValueError('Type names and field names cannot start with '
-                             'a number: %r' % name)
-    seen = set()
-    for name in field_names:
-        if name.startswith('_') and not rename:
-            raise ValueError('Field names cannot start with an underscore: '
-                             '%r' % name)
-        if name in seen:
-            raise ValueError('Encountered duplicate field name: %r' % name)
-        seen.add(name)
-
-    # Fill-in the class template
-    fmt_kw = {'typename': typename}
-    fmt_kw['field_names'] = tuple(field_names)
-    fmt_kw['num_fields'] = len(field_names)
-    fmt_kw['arg_list'] = repr(tuple(field_names)).replace("'", "")[1:-1]
-    fmt_kw['repr_fmt'] = ', '.join(_repr_tmpl.format(name=name)
-                                   for name in field_names)
-    fmt_kw['field_defs'] = '\n'.join(_imm_field_tmpl.format(index=index, name=name)
-                                     for index, name in enumerate(field_names))
-    class_definition = _namedtuple_tmpl.format(**fmt_kw)
-
-    if verbose:
-        print(class_definition)
-
-    # Execute the template string in a temporary namespace and support
-    # tracing utilities by setting a value for frame.f_globals['__name__']
-    namespace = dict(_itemgetter=_itemgetter,
-                     __name__='namedtuple_%s' % typename,
-                     OrderedDict=OrderedDict,
-                     _property=property,
-                     _tuple=tuple)
-    try:
-        exec_(class_definition, namespace)
-    except SyntaxError as e:
-        raise SyntaxError(e.message + ':\n' + class_definition)
-    result = namespace[typename]
-
-    # For pickling to work, the __module__ variable needs to be set to the frame
-    # where the named tuple is created.  Bypass this step in environments where
-    # sys._getframe is not defined (Jython for example) or sys._getframe is not
-    # defined for arguments greater than 0 (IronPython).
-    try:
-        frame = _sys._getframe(1)
-        result.__module__ = frame.f_globals.get('__name__', '__main__')
-    except (AttributeError, ValueError):
-        pass
-
-    return result
-
-
-#################################################################
-### namedlist
-#################################################################
-
-_namedlist_tmpl = '''\
-class {typename}(list):
-    '{typename}({arg_list})'
-
-    __slots__ = ()
-
-    _fields = {field_names!r}
-
-    def __new__(_cls, {arg_list}):  # TODO: tweak sig to make more extensible
-        'Create new instance of {typename}({arg_list})'
-        return _list.__new__(_cls, ({arg_list}))
-
-    def __init__(self, {arg_list}):  # tuple didn't need this but list does
-        return _list.__init__(self, ({arg_list}))
-
-    @classmethod
-    def _make(cls, iterable, new=_list, len=len):
-        'Make a new {typename} object from a sequence or iterable'
-        # why did this function exist? why not just star the
-        # iterable like below?
-        result = cls(*iterable)
-        if len(result) != {num_fields:d}:
-            raise TypeError('Expected {num_fields:d} arguments,'
-                            ' got %d' % len(result))
-        return result
-
-    def __repr__(self):
-        'Return a nicely formatted representation string'
-        tmpl = self.__class__.__name__ + '({repr_fmt})'
-        return tmpl % tuple(self)
-
-    def _asdict(self):
-        'Return a new OrderedDict which maps field names to their values'
-        return OrderedDict(zip(self._fields, self))
-
-    def _replace(_self, **kwds):
-        'Return a new {typename} object replacing field(s) with new values'
-        result = _self._make(map(kwds.pop, {field_names!r}, _self))
-        if kwds:
-            raise ValueError('Got unexpected field names: %r' % kwds.keys())
-        return result
-
-    def __getnewargs__(self):
-        'Return self as a plain list.  Used by copy and pickle.'
-        return tuple(self)
-
-    __dict__ = _property(_asdict)
-
-    def __getstate__(self):
-        'Exclude the OrderedDict from pickling'  # wat
-        pass
-
-{field_defs}
-'''
-
-
-def namedlist(typename, field_names, verbose=False, rename=False):
-    """Returns a new subclass of list with named fields.
-
-    >>> Point = namedlist('Point', ['x', 'y'])
-    >>> Point.__doc__                   # docstring for the new class
-    'Point(x, y)'
-    >>> p = Point(11, y=22)             # instantiate with pos args or keywords
-    >>> p[0] + p[1]                     # indexable like a plain list
-    33
-    >>> x, y = p                        # unpack like a regular list
-    >>> x, y
-    (11, 22)
-    >>> p.x + p.y                       # fields also accessible by name
-    33
-    >>> d = p._asdict()                 # convert to a dictionary
-    >>> d['x']
-    11
-    >>> Point(**d)                      # convert from a dictionary
-    Point(x=11, y=22)
-    >>> p._replace(x=100)               # _replace() is like str.replace() but targets named fields
-    Point(x=100, y=22)
-    """
-
-    # Validate the field names.  At the user's option, either generate an error
-    # message or automatically replace the field name with a valid name.
-    if isinstance(field_names, basestring):
-        field_names = field_names.replace(',', ' ').split()
-    field_names = [str(x) for x in field_names]
-    if rename:
-        seen = set()
-        for index, name in enumerate(field_names):
-            if (not all(c.isalnum() or c == '_' for c in name)
-                or _iskeyword(name)
-                or not name
-                or name[0].isdigit()
-                or name.startswith('_')
-                or name in seen):
-                field_names[index] = '_%d' % index
-            seen.add(name)
-    for name in [typename] + field_names:
-        if not all(c.isalnum() or c == '_' for c in name):
-            raise ValueError('Type names and field names can only contain '
-                             'alphanumeric characters and underscores: %r'
-                             % name)
-        if _iskeyword(name):
-            raise ValueError('Type names and field names cannot be a '
-                             'keyword: %r' % name)
-        if name[0].isdigit():
-            raise ValueError('Type names and field names cannot start with '
-                             'a number: %r' % name)
-    seen = set()
-    for name in field_names:
-        if name.startswith('_') and not rename:
-            raise ValueError('Field names cannot start with an underscore: '
-                             '%r' % name)
-        if name in seen:
-            raise ValueError('Encountered duplicate field name: %r' % name)
-        seen.add(name)
-
-    # Fill-in the class template
-    fmt_kw = {'typename': typename}
-    fmt_kw['field_names'] = tuple(field_names)
-    fmt_kw['num_fields'] = len(field_names)
-    fmt_kw['arg_list'] = repr(tuple(field_names)).replace("'", "")[1:-1]
-    fmt_kw['repr_fmt'] = ', '.join(_repr_tmpl.format(name=name)
-                                   for name in field_names)
-    fmt_kw['field_defs'] = '\n'.join(_m_field_tmpl.format(index=index, name=name)
-                                     for index, name in enumerate(field_names))
-    class_definition = _namedlist_tmpl.format(**fmt_kw)
-
-    if verbose:
-        print(class_definition)
-
-    def _itemsetter(key):
-        def _itemsetter(obj, value):
-            obj[key] = value
-        return _itemsetter
-
-    # Execute the template string in a temporary namespace and support
-    # tracing utilities by setting a value for frame.f_globals['__name__']
-    namespace = dict(_itemgetter=_itemgetter,
-                     _itemsetter=_itemsetter,
-                     __name__='namedlist_%s' % typename,
-                     OrderedDict=OrderedDict,
-                     _property=property,
-                     _list=list)
-    try:
-        exec_(class_definition, namespace)
-    except SyntaxError as e:
-        raise SyntaxError(e.message + ':\n' + class_definition)
-    result = namespace[typename]
-
-    # For pickling to work, the __module__ variable needs to be set to
-    # the frame where the named list is created.  Bypass this step in
-    # environments where sys._getframe is not defined (Jython for
-    # example) or sys._getframe is not defined for arguments greater
-    # than 0 (IronPython).
-    try:
-        frame = _sys._getframe(1)
-        result.__module__ = frame.f_globals.get('__name__', '__main__')
-    except (AttributeError, ValueError):
-        pass
-
-    return result