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편집 파일: pycompat24.py

# This code is part of Ansible, but is an independent component.
# This particular file snippet, and this file snippet only, is BSD licensed.
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# Copyright (c) 2016, Toshio Kuratomi <tkuratomi@ansible.com>
# Copyright (c) 2015, Marius Gedminas
#
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# are permitted provided that the following conditions are met:
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#    * Redistributions of source code must retain the above copyright
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from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import sys

def get_exception():
    """Get the current exception.

This code needs to work on Python 2.4 through 3.x, so we cannot use
    "except Exception, e:" (SyntaxError on Python 3.x) nor
    "except Exception as e:" (SyntaxError on Python 2.4-2.5).
    Instead we must use ::

except Exception:
            e = get_exception()

"""
    return sys.exc_info()[1]

try:
    # Python 2.6+
    from ast import literal_eval
except ImportError:
    # a replacement for literal_eval that works with python 2.4. from:
    # https://mail.python.org/pipermail/python-list/2009-September/551880.html
    # which is essentially a cut/paste from an earlier (2.6) version of python's
    # ast.py
    from compiler import ast, parse
    from ansible.module_utils.six import binary_type, integer_types, string_types, text_type

def literal_eval(node_or_string):  # type: ignore[misc]
        """
        Safely evaluate an expression node or a string containing a Python
        expression.  The string or node provided may only consist of the  following
        Python literal structures: strings, numbers, tuples, lists, dicts,  booleans,
        and None.
        """
        _safe_names = {'None': None, 'True': True, 'False': False}
        if isinstance(node_or_string, string_types):
            node_or_string = parse(node_or_string, mode='eval')
        if isinstance(node_or_string, ast.Expression):
            node_or_string = node_or_string.node

def _convert(node):
            if isinstance(node, ast.Const) and isinstance(node.value, (text_type, binary_type, float, complex) + integer_types):
                return node.value
            elif isinstance(node, ast.Tuple):
                return tuple(map(_convert, node.nodes))
            elif isinstance(node, ast.List):
                return list(map(_convert, node.nodes))
            elif isinstance(node, ast.Dict):
                return dict((_convert(k), _convert(v)) for k, v in node.items())
            elif isinstance(node, ast.Name):
                if node.name in _safe_names:
                    return _safe_names[node.name]
            elif isinstance(node, ast.UnarySub):
                return -_convert(node.expr)  # pylint: disable=invalid-unary-operand-type
            raise ValueError('malformed string')
        return _convert(node_or_string)

__all__ = ('get_exception', 'literal_eval')