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Clone of @virtuald's PR #2112 with minor enhancements. (#3215)

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* Add py::raise_from to enable chaining exceptions on Python 3.3+

* Use 'raise from' in initialization

* Documenting the exact base version of _PyErr_FormatVFromCause, adding back `assert`s.

Co-authored-by: Dustin Spicuzza <dustin@virtualroadside.com>
This commit is contained in:
Ralf W. Grosse-Kunstleve
2021-08-23 17:30:01 -07:00
committed by GitHub
parent 6cbabc4b8c
commit c8ce4b8df8
6 changed files with 136 additions and 0 deletions
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16
tests/test_embed/test_interpreter.cpp
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@@ -74,8 +74,24 @@ TEST_CASE("Import error handling") {
REQUIRE_NOTHROW(py::module_::import("widget_module"));
REQUIRE_THROWS_WITH(py::module_::import("throw_exception"),
"ImportError: C++ Error");
#if PY_VERSION_HEX >= 0x03030000
REQUIRE_THROWS_WITH(py::module_::import("throw_error_already_set"),
Catch::Contains("ImportError: initialization failed"));
auto locals = py::dict("is_keyerror"_a=false, "message"_a="not set");
py::exec(R"(
try:
import throw_error_already_set
except ImportError as e:
is_keyerror = type(e.__cause__) == KeyError
message = str(e.__cause__)
)", py::globals(), locals);
REQUIRE(locals["is_keyerror"].cast<bool>() == true);
REQUIRE(locals["message"].cast<std::string>() == "'missing'");
#else
REQUIRE_THROWS_WITH(py::module_::import("throw_error_already_set"),
Catch::Contains("ImportError: KeyError"));
#endif
}
TEST_CASE("There can be only one interpreter") {