PEP 810: Add comprehensive Lazy Import tests ported from Cinder test suite

Lib/test/test_lazy_import/data/circular_import_pkg/__init__.py

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+

Lib/test/test_lazy_import/data/circular_import_pkg/main.py

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+from .x import X2
+X2()

Lib/test/test_lazy_import/data/circular_import_pkg/x.py

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+def X1():
+    return "X"
+
+from .y import Y1
+
+def X2():
+    return Y1()

Lib/test/test_lazy_import/data/circular_import_pkg/y.py

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+def Y1():
+    return "Y"
+
+from .x import X2
+
+def Y2():
+    return X2()

Lib/test/test_lazy_import/data/cycle_with_load_global_pkg/__init__.py

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+

Lib/test/test_lazy_import/data/cycle_with_load_global_pkg/a.py

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+from .b import B
+
+def get_B():
+    return B
+
+B

Lib/test/test_lazy_import/data/cycle_with_load_global_pkg/b.py

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+B = "B"
+
+from .a import get_B
+
+get_B()

Lib/test/test_lazy_import/data/metasyntactic/__init__.py

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+

Lib/test/test_lazy_import/data/metasyntactic/foo/__init__.py

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+Foo = "Foo"

Lib/test/test_lazy_import/data/metasyntactic/foo/ack/__init__.py

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+Ack = "Ack"

Lib/test/test_lazy_import/data/metasyntactic/foo/bar/__init__.py

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+Bar = "Bar"

Lib/test/test_lazy_import/data/metasyntactic/foo/bar/baz/__init__.py

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+Baz = "Baz"

Lib/test/test_lazy_import/data/metasyntactic/foo/bar/baz/qux/__init__.py

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+Qux = "Qux"

Lib/test/test_lazy_import/data/metasyntactic/foo/bar/thud/__init__.py

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+Thud = "Thud"

Lib/test/test_lazy_import/data/metasyntactic/names.py

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+from .foo import Foo
+from .foo.ack import Ack
+from .foo.bar import Bar
+from .foo.bar.baz import Baz
+from .foo.bar.thud import Thud
+from .waldo import Waldo
+from .waldo.fred import Fred
+from .plugh import Plugh
+Metasyntactic = "Metasyntactic"

Lib/test/test_lazy_import/data/metasyntactic/plugh/__init__.py

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+Plugh = "Plugh"

Lib/test/test_lazy_import/data/metasyntactic/waldo/__init__.py

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+Waldo = "Waldo"

Lib/test/test_lazy_import/data/metasyntactic/waldo/fred/__init__.py

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+Fred = "Fred"

Lib/test/test_lazy_import/data/module_same_name_var_order1/__init__.py

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+from .bar import Bar
+bar = "Blah"
+Bar

Lib/test/test_lazy_import/data/module_same_name_var_order1/bar.py

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+Bar = "Bar"

Lib/test/test_lazy_import/data/module_same_name_var_order2/__init__.py

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+bar = "Blah"
+from .bar import Bar
+Bar

Lib/test/test_lazy_import/data/module_same_name_var_order2/bar.py

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+Bar = "Bar"

Lib/test/test_lazy_import/data/versioned/__init__.py

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+from .__version__ import __version__
+from .__version__ import __copyright__

Lib/test/test_lazy_import/data/versioned/__version__.py

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+__version__ = "1.0"
+__copyright__ = "Copyright (c) 2001-2022 Python Software Foundation."