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0ac329ec01
* Also enhanced reporting error exit reporting through the scons logger to provide the exception in the compilation report. * More error exits in scons should do this.
162 lines
3.5 KiB
Python
162 lines
3.5 KiB
Python
# Copyright 2025, Kay Hayen, mailto:kay.hayen@gmail.com find license text at end of file
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"""Covers call order of Python3 meta classes."""
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# nuitka-project: --nofollow-imports
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try:
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from collections.abc import OrderedDict
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except ImportError:
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from collections import OrderedDict
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print("Call order of Python3 meta classes:")
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def a():
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x = 1
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class A:
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print("Class body a.A is evaluating closure x", x)
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print("Called", a)
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return A
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def b():
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class B:
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pass
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print("Called", b)
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return B
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def displayable(dictionary):
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d = dict(dictionary)
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if "__firstlineno__" in d:
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del d["__firstlineno__"]
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if "__static_attributes__" in d:
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del d["__static_attributes__"]
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return sorted(d.items())
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def m():
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class M(type):
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def __new__(cls, class_name, bases, attrs, **over):
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print(
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"Metaclass M.__new__ cls",
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cls,
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"name",
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class_name,
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"bases",
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bases,
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"dict",
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displayable(attrs),
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"extra class defs",
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displayable(over),
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)
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return type.__new__(cls, class_name, bases, attrs)
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def __init__(self, name, bases, attrs, **over):
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print(
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"Metaclass M.__init__",
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name,
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bases,
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displayable(attrs),
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displayable(over),
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)
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super().__init__(name, bases, attrs)
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def __prepare__(cls, bases, **over):
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print("Metaclass M.__prepare__", cls, bases, displayable(over))
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return OrderedDict()
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print("Called", m)
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return M
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def d():
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print("Called", d)
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return 1
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def e():
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print("Called", e)
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return 2
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class C1(a(), b(), other=d(), metaclass=m(), yet_other=e()):
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import sys
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# TODO: Enable this.
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# print("C1 locals type is", type(sys._getframe().f_locals))
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print("OK, class created", C1)
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print("Attribute C1.__dict__ has type", type(C1.__dict__))
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print("Function local classes can be made global and get proper __qualname__:")
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def someFunctionWithLocalClassesMadeGlobal():
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# Affects __qualname__ only in Python3.4 or higher, not in Python3.2
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global C
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class C:
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pass
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class D:
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pass
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try:
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print("Nested class qualname is", D.__qualname__)
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except AttributeError:
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# Python3.2
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pass
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try:
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print("Local class made global qualname is", C.__qualname__)
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except AttributeError:
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pass
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someFunctionWithLocalClassesMadeGlobal()
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print("Function in a class with private name")
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class someClassWithPrivateArgumentNames:
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def f(self, *, __kw: 1):
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pass
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print(someClassWithPrivateArgumentNames.f.__annotations__)
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print("OK.")
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# Python tests originally created or extracted from other peoples work. The
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# parts were too small to be protected.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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