ErrLookup › PyO3/pyo3

PyO3/pyo3

Rust bindings for the Python interpreter · Rust · 349 source files

Analyzed at ac9b6899d3 on 2026-09-05. 101 documented errors.

Code / Message	Type	Severity	Tags
Unknown Py_GIL_DISABLED value	panic	error	build-config, python-interpreter, free-threading, panic
invalid hex encoding	panic	error	build-script, hex-decoding, panic
`pyo3_build_config::get()` requires a direct dependency on `	panic	error	cargo, build-script, missing-dependency, panic
string contains nul bytes	panic	error	ffi, cstr, nul-byte, const-panic, compile-time
Converting PyErr arguments failed: {}	panic	error	pyerr, into-pyobject, conversion, panic
attempted to fetch exception but none was set	panic	critical	pyerr, ffi, error-indicator, panic
failed to import exception {}.{}: {}	panic	error	exceptions, import-error, embedded-python, panic
failed to create type object for `{type_name}`	panic	critical	pyclass, type-object, initialization, panic
Cannot clone pointer into Python heap without the thread bei	panic	critical	gil, thread-attach, py-pointer, panic
PyObject pointer is null	panic	critical	ffi, null-pointer, pyerr, panic
Attaching a thread to the interpreter is prohibited while a	panic	error	pyo3, gil, gc-traverse, panic
Cannot attach to the Python interpreter while it is finalizi	panic	error	pyo3, gil, interpreter-finalization, shutdown, panic
Attaching a thread to the interpreter is currently prohibite	panic	error	pyo3, gil, reentrancy, panic
Cannot drop pointer into Python heap without the thread bein	panic	critical	pyo3, refcount, gil, process-abort
{}	panic	error	pyo3, panic, python-c-api, error-printing
called `append_to_inittab` but a Python interpreter is alrea	panic	error	pyo3, embedding, inittab, initialization-order
Unknown return value from PyDict_SetDefaultRef: {x}	panic	error	pyo3, dict, c-api, panic, python-3-13
dictionary changed size during iteration	panic	error	pyo3, dict, iteration, mutation, panic
dictionary keys changed during iteration	panic	error	pyo3, dict, iteration, mutation, panic
The 'weakref' weak reference instance should be valid (non-n	panic	error
The 'weakref.ProxyType' (or `weakref.CallableProxyType`) ins	panic	error
The 'weakref.ReferenceType' instance should be valid (non-nu	panic	error
expected a bool (1/true/True or 0/false/False) for Py_ENABLE	validation	error
Cannot target free-threaded builds for Python versions befor	validation	error
build_flags contains Py_GIL_DISABLED but target_abi '{target	validation	error
unsupported Python interpreter	validation	error
unknown interpreter: {}	validation	error
Could not find _sysconfigdata*.py in {}	validation	error
Detected multiple possible Python versions. Please set eithe	validation	error
Neither abi3 or abi3t features are enabled	validation	error	rust, pyo3, cargo-features, abi3, build-time
Cannot target an abi3t version below {MINIMUM_SUPPORTED_VERS	validation	error	rust, pyo3, abi3, free-threaded, version-check, build-time
failed to run the Python interpreter at {}: {}	validation	error	rust, pyo3, python-interpreter, process-spawn, build-time
Python script failed	validation	error	rust, pyo3, python-interpreter, script-failure, build-time
cannot set a minimum Python version {} higher than the inter	validation	error	rust, pyo3, abi3, version-mismatch, cargo-features, build-time
unexpected Rust target pointer width: {}	validation	error	rust, pyo3, cross-compilation, pointer-width, build-time
broken Python interpreter: {}	console	error	rust, pyo3, python-interpreter, broken-interpreter, windows, build-time
At least GraalPy version {} needed, got {}	console	error	rust, pyo3, graalpy, version-check, build-time
PYO3_CONFIG_FILE must be an absolute path	console	error	rust, pyo3, env-var, path, pyo3-config-file, build-time
Invalid config that sets both target_abi and abi3.	console	error	rust, pyo3, config-file, schema-validation, abi3, build-time
RustPython only supports targeting abi3t, it does not allow	console	error
cannot set a minimum Python version {} higher than the inter	console	error
PYO3_CROSS_LIB_DIR variable value is not a valid UTF-8 strin	console	error
Python stdout len didn't return expected number of lines: {}	console	error
Cannot compile extensions for the free-threaded build on Pyt	console	error
target_triple_from_env() must be called from a build script	panic	error
Unrecognized TARGET environment variable value	panic	error
no interpreter executable	panic	error
failed to parse PyO3 config	panic	error	rust, build-script, pyo3, configuration
the configured Python interpreter version ({}) is lower than	console	error	rust, python, version-compatibility, build
PyO3 does not support the free-threaded build of CPython ver	console	error	rust, python, free-threaded, nogil, version-compatibility
the configured PyPy interpreter version ({}) is lower than P	console	error	rust, pypy, version-compatibility, build
the configured GraalPy interpreter version ({}) is lower tha	console	error	rust, graalpy, version-compatibility, build
Abi3t builds are not supported on CPython targets before Pyt	console	error	rust, abi3, free-threaded, version-compatibility
your Rust target architecture ({}-bit) does not match your p	console	error	rust, cross-compilation, pointer-width, build
wildcard argument names are not supported	validation	error	rust, pyo3-macros, proc-macro, function-signature
useless `get` - the struct is already annotated with `get_al	validation	error	rust, pyo3-macros, pyclass, duplicate-attribute
useless `set` - the struct is already annotated with `set_al	validation	error	rust, pyo3-macros, pyclass, duplicate-attribute
`get` may only be specified once	validation	error	rust, pyo3, macro, compile-time
`set` may only be specified once	validation	error	rust, pyo3, macro, compile-time
`name` may only be specified once	validation	error	rust, pyo3, macro, compile-time
missing `message` in `warn` attribute	validation	error	rust, pyo3, macro, attributes
Python doc may not contain nul byte, found nul at position {	validation	error	rust, pyo3, macro, docstring
size_t should fit the flag bits	panic	error	rust, pyo3-ffi, const-panic, platform
size_t should fit the flag bits	panic	error	rust, pyo3-ffi, const-panic, platform
cannot fail due to mask	panic	error	rust, pyo3-ffi, invariant, vectorcall
Empty enum	panic	error	rust, pyo3, derive, enum
Named fields should have identifiers	panic	error	rust, pyo3, derive, internal
Named fields should have identifiers	panic	error	pyo3, proc-macro, panic, internal-invariant
Empty enum	panic	error	pyo3, proc-macro, enum, compile-time-panic
no class given for Fn with a "self" receiver	panic	error	pyo3, proc-macro, method-generation, internal-invariant
no class given for a class method	panic	error	pyo3, proc-macro, classmethod, internal-invariant
complex enum has a non-unit variant	panic	error	pyo3, proc-macro, enum, internal-invariant
named field has an identifier	panic	error	pyo3, proc-macro, enum, internal-invariant
should always have positional defaults <= positional paramet	panic	error	pyo3, proc-macro, signature, internal-invariant
length of buffer fits in Py_ssize_t	panic	info	pyo3, integer-conversion, platform, unreachable
wasi strings are UTF8	panic	error	pyo3, wasi, path-conversion, utf8, panic
seconds overflow	panic	info	pyo3, datetime, timedelta, duration, unreachable
unexpected error in coroutine waker	panic	error	rust, async, coroutine, waker
failed to create Python string	panic	warning	rust, pyo3, type-error, string-conversion
PyErr state should never be invalid outside of normalization	panic	critical	rust, pyo3, pyerr, internal-invariant
Already mutably borrowed	panic	error	rust, pyo3, borrow-checker, reentrancy
Already borrowed	panic	error	rust, pyo3, borrow-checker, pyrefmut
this object is already borrowed	panic	error	rust, pyo3, inheritance, borrow-checker
this object is already borrowed	panic	error	rust, pyo3, inheritance, guard, borrow-checker
failed to import `datetime` C API	panic	critical	rust, pyo3, datetime, c-api, frozen-binary
`PyFrame_GetBuiltins` returns a `dict`	panic	warning	rust, pyo3, frame, builtins, type-mismatch
frozenset should always be iterable	panic	info	rust, pyo3, frozenset, iterator, invariant
frozenset iteration should be infallible	panic	error	pyo3, iterator, panic, frozenset
out of range integral type conversion attempted on `elements	panic	error	pyo3, panic, overflow, list
set should always be iterable	panic	error	pyo3, panic, set, iterator
set iteration should be infallible	panic	error	pyo3, panic, set, iterator
expected error	panic	error	pyo3, panic, string, formatting
out of range integral type conversion attempted on `elements	panic	error	pyo3, panic, overflow, tuple
failed to convert tuple to list	panic	error	pyo3, panic, tuple, list
0 < N <= 12	panic	error	pyo3, panic, tuple, array
overflow adding PY_VECTORCALL_ARGUMENTS_OFFSET	panic	error	rust, pyo3, overflow, ffi
Cannot get `__mro__` from object.	panic	error	rust, pyo3, pypy, limited-api, types
Unexpected type in `__mro__` attribute.	panic	error	rust, pyo3, pypy, limited-api, types
Cannot get `__bases__` from object.	panic	error	rust, pyo3, pypy, limited-api, types
Unexpected type in `__bases__` attribute.	panic	error	rust, pyo3, pypy, limited-api, types
ignored leap-second, `datetime` does not support leap-second	console	warning	rust, pyo3, chrono, datetime, precision-loss