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File Name : _immutable.py

import sys

def immutable(members='', name='Immutable', verbose=False):
    """
    Produces a class that either can be used standalone or as a base class for persistent classes.

This is a thin wrapper around a named tuple.

Constructing a type and using it to instantiate objects:

>>> Point = immutable('x, y', name='Point')
    >>> p = Point(1, 2)
    >>> p2 = p.set(x=3)
    >>> p
    Point(x=1, y=2)
    >>> p2
    Point(x=3, y=2)

Inheriting from a constructed type. In this case no type name needs to be supplied:

>>> class PositivePoint(immutable('x, y')):
    ...     __slots__ = tuple()
    ...     def __new__(cls, x, y):
    ...         if x > 0 and y > 0:
    ...             return super(PositivePoint, cls).__new__(cls, x, y)
    ...         raise Exception('Coordinates must be positive!')
    ...
    >>> p = PositivePoint(1, 2)
    >>> p.set(x=3)
    PositivePoint(x=3, y=2)
    >>> p.set(y=-3)
    Traceback (most recent call last):
    Exception: Coordinates must be positive!

The persistent class also supports the notion of frozen members. The value of a frozen member
    cannot be updated. For example it could be used to implement an ID that should remain the same
    over time. A frozen member is denoted by a trailing underscore.

>>> Point = immutable('x, y, id_', name='Point')
    >>> p = Point(1, 2, id_=17)
    >>> p.set(x=3)
    Point(x=3, y=2, id_=17)
    >>> p.set(id_=18)
    Traceback (most recent call last):
    AttributeError: Cannot set frozen members id_
    """

if isinstance(members, str):
        members = members.replace(',', ' ').split()

def frozen_member_test():
        frozen_members = ["'%s'" % f for f in members if f.endswith('_')]
        if frozen_members:
            return """
        frozen_fields = fields_to_modify & set([{frozen_members}])
        if frozen_fields:
            raise AttributeError('Cannot set frozen members %s' % ', '.join(frozen_fields))
            """.format(frozen_members=', '.join(frozen_members))

return ''

quoted_members = ', '.join("'%s'" % m for m in members)
    template = """
class {class_name}(namedtuple('ImmutableBase', [{quoted_members}])):
    __slots__ = tuple()

def __repr__(self):
        return super({class_name}, self).__repr__().replace('ImmutableBase', self.__class__.__name__)

def set(self, **kwargs):
        if not kwargs:
            return self

fields_to_modify = set(kwargs.keys())
        if not fields_to_modify <= {member_set}:
            raise AttributeError("'%s' is not a member" % ', '.join(fields_to_modify - {member_set}))

{frozen_member_test}

return self.__class__.__new__(self.__class__, *map(kwargs.pop, [{quoted_members}], self))
""".format(quoted_members=quoted_members,
               member_set="set([%s])" % quoted_members if quoted_members else 'set()',
               frozen_member_test=frozen_member_test(),
               class_name=name)

if verbose:
        print(template)

from collections import namedtuple
    namespace = dict(namedtuple=namedtuple, __name__='pyrsistent_immutable')
    try:
        exec(template, namespace)
    except SyntaxError as e:
        raise SyntaxError(str(e) + ':\n' + template) from e

return namespace[name]

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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-05-15 07:01:35
..	dir	-	root/root	0755	2025-12-10 08:02:17
__pycache__	dir	-	root/root	0755	2025-05-15 07:01:40
__init__.py	text/x-python	1.44 KB	root/root	0644	2025-04-17 01:10:58
__init__.pyi	text/x-python	7.02 KB	root/root	0644	2025-04-17 01:10:58
_checked_types.py	text/x-python	17.94 KB	root/root	0644	2025-04-17 01:10:58
_field_common.py	text/x-python	11.68 KB	root/root	0644	2025-04-17 01:10:58
_helpers.py	text/x-python	3.16 KB	root/root	0644	2025-04-17 01:10:58
_immutable.py	text/x-python	3.21 KB	root/root	0644	2025-04-17 01:10:58
_pbag.py	text/x-python	6.57 KB	root/root	0644	2025-04-17 01:10:58
_pclass.py	text/x-python	9.47 KB	root/root	0644	2025-04-17 01:10:58
_pdeque.py	text/x-python	11.92 KB	root/root	0644	2025-04-17 01:10:58
_plist.py	text/x-python	8.1 KB	root/root	0644	2025-04-17 01:10:58
_pmap.py	text/x-python	18.34 KB	root/root	0644	2025-04-17 01:10:58
_precord.py	text/x-python	6.87 KB	root/root	0644	2025-04-17 01:10:58
_pset.py	text/x-python	5.56 KB	root/root	0644	2025-04-17 01:10:58
_pvector.py	text/x-python	22.16 KB	root/root	0644	2025-04-17 01:10:58
_toolz.py	text/plain	3.34 KB	root/root	0644	2025-04-17 01:10:58
_transformations.py	text/x-python	3.71 KB	root/root	0644	2025-04-17 01:10:58
py.typed	application/x-empty	0 B	root/root	0644	2025-04-17 01:10:58
typing.py	text/plain	1.73 KB	root/root	0644	2025-04-17 01:10:58
typing.pyi	text/x-python	10.17 KB	root/root	0644	2025-04-17 01:10:58