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📁 ..
📄 __init__.py(6.3 KB)
📄 __init__.pyc(7.77 KB)
📄 _collections.py(28.46 KB)
📄 _collections.pyc(49.44 KB)
📄 _compat_py3k.py(2.14 KB)
📄 _concurrency_py3k.py(6.39 KB)
📄 _preloaded.py(2.34 KB)
📄 _preloaded.pyc(2.97 KB)
📄 compat.py(17.95 KB)
📄 compat.pyc(21.75 KB)
📄 concurrency.py(2.22 KB)
📄 concurrency.pyc(2.59 KB)
📄 deprecations.py(13.35 KB)
📄 deprecations.pyc(12.85 KB)
📄 langhelpers.py(54.97 KB)
📄 langhelpers.pyc(62.67 KB)
📄 queue.py(9.08 KB)
📄 queue.pyc(10.42 KB)
📄 tool_support.py(5.99 KB)
📄 topological.py(2.79 KB)
📄 topological.pyc(2.54 KB)

Editing: _preloaded.py

# util/_preloaded.py
# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: https://www.opensource.org/licenses/mit-license.php

"""supplies the "preloaded" registry to resolve circular module imports at
runtime.

"""

import sys

from . import compat

class _ModuleRegistry:
    """Registry of modules to load in a package init file.

To avoid potential thread safety issues for imports that are deferred
    in a function, like https://bugs.python.org/issue38884, these modules
    are added to the system module cache by importing them after the packages
    has finished initialization.

A global instance is provided under the name :attr:`.preloaded`. Use
    the function :func:`.preload_module` to register modules to load and
    :meth:`.import_prefix` to load all the modules that start with the
    given path.

While the modules are loaded in the global module cache, it's advisable
    to access them using :attr:`.preloaded` to ensure that it was actually
    registered. Each registered module is added to the instance ``__dict__``
    in the form `<package>_<module>`, omitting ``sqlalchemy`` from the package
    name. Example: ``sqlalchemy.sql.util`` becomes ``preloaded.sql_util``.
    """

def __init__(self, prefix="sqlalchemy."):
        self.module_registry = set()
        self.prefix = prefix

def preload_module(self, *deps):
        """Adds the specified modules to the list to load.

This method can be used both as a normal function and as a decorator.
        No change is performed to the decorated object.
        """
        self.module_registry.update(deps)
        return lambda fn: fn

def import_prefix(self, path):
        """Resolve all the modules in the registry that start with the
        specified path.
        """
        for module in self.module_registry:
            if self.prefix:
                key = module.split(self.prefix)[-1].replace(".", "_")
            else:
                key = module
            if (
                not path or module.startswith(path)
            ) and key not in self.__dict__:
                compat.import_(module, globals(), locals())
                self.__dict__[key] = sys.modules[module]

preloaded = _ModuleRegistry()
preload_module = preloaded.preload_module

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