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bpo-38530: Offer suggestions on AttributeError (#16856)

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When printing AttributeError, PyErr_Display will offer suggestions of similar 
attribute names in the object that the exception was raised from:

>>> collections.namedtoplo
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: module 'collections' has no attribute 'namedtoplo'. Did you mean: namedtuple?
This commit is contained in:
Pablo Galindo
2021-04-14 02:36:07 +01:00
committed by GitHub
parent 3bc694d5f3
commit 37494b441a
12 changed files with 472 additions and 17 deletions
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Python/pythonrun.c
+11 -1
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@@ -15,7 +15,7 @@
#include "pycore_interp.h" // PyInterpreterState.importlib
#include "pycore_object.h" // _PyDebug_PrintTotalRefs()
#include "pycore_parser.h" // _PyParser_ASTFromString()
#include "pycore_pyerrors.h" // _PyErr_Fetch
#include "pycore_pyerrors.h" // _PyErr_Fetch, _Py_Offer_Suggestions
#include "pycore_pylifecycle.h" // _Py_UnhandledKeyboardInterrupt
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_sysmodule.h" // _PySys_Audit()
@@ -953,6 +953,16 @@ print_exception(PyObject *f, PyObject *value)
if (err < 0) {
PyErr_Clear();
}
PyObject* suggestions = _Py_Offer_Suggestions(value);
if (suggestions) {
// Add a trailer ". Did you mean: (...)?"
err = PyFile_WriteString(". Did you mean: ", f);
if (err == 0) {
err = PyFile_WriteObject(suggestions, f, Py_PRINT_RAW);
err += PyFile_WriteString("?", f);
}
Py_DECREF(suggestions);
}
err += PyFile_WriteString("\n", f);
Py_XDECREF(tb);
Py_DECREF(value);