REDROOM

Edit File Size: 3.21 KB

//lib/python3/dist-packages/pyrsistent/_immutable.py

Text Base64

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]

Exit & Reset Text mode: syntax highlighting auto-detects file type.

Name	Size	Perms	Modified	Actions
__pycache__ DIR	-	drwxr-xr-x	2026-01-08 12:56:05	Edit Download recursive recursive
py.typed	0 B	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
typing.py	1.84 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
typing.pyi	10.17 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_checked_types.py	18.11 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_field_common.py	11.68 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_helpers.py	3.39 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_immutable.py	3.21 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pbag.py	6.65 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pclass.py	9.47 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pdeque.py	12.00 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_plist.py	8.19 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pmap.py	18.74 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_precord.py	6.87 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pset.py	5.64 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_pvector.py	22.25 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_toolz.py	3.34 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
_transformations.py	3.87 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
__init__.py	1.44 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive
__init__.pyi	7.02 KB	lrw-r--r--	2023-10-25 20:54:06	Edit Download recursive recursive

Directory Contents