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# Manipulando Exceções

As funções descritas nesse capítulo permitem você tratar e gerar exceções em Python. É importante entender alguns princípios básicos no tratamento de exceção no Python. Funciona de forma parecida com a variável POSIX `errno` variable:: existe um indicador global (por thread) do último erro ocorrido. A maioria das funções da API C não limpa isso com êxito, mas indica a causa do erro na falha. A maioria das funções da API retorna um indicador de erro, geralmente, “NULL” se eles devem retornar um ponteiro, or “-1” se retornarem um número inteiro (exception: the `PyArg_*()` functions return `1` em caso de sucesso e `0` em caso de falha)

Concretamente, o indicador de erro consiste em três ponteiros de objeto: o tipo da exceção, o valor da exceção e o objeto de retorno. Qualquer um desses ponteiros pode ser `` NULL`` se não definido (embora algumas combinações sejam proibidas, por exemplo, você não pode ter um retorno não `` NULL` se o tipo de exceção for` NULL`).

Quando uma função deve falhar porque devido à falha de alguma função que ela chamou, ela geralmente não define o indicador de erro; a função que ela chamou já o definiu. Ela é responsável por manipular o erro e limpar a exceção ou retornar após limpar todos os recursos que possui (como referências a objetos ou alocações de memória); ela não deve continuar normalmente se não estiver preparada para lidar com o erro. Se estiver retornando devido a um erro, é importante indicar ao chamador que um erro foi definido. Se o erro não for manipulado ou propagado com cuidado, chamadas adicionais para a API Python/C podem não se comportar conforme o esperado e podem falhar de maneiras misteriosas.

Nota

The error indicator is not the result of `sys.exc_info()`. The former corresponds to an exception that is not yet caught (and is therefore still propagating), while the latter returns an exception after it is caught (and has therefore stopped propagating).

## Impressão e limpeza

void `PyErr_Clear`()

  Limpe o indicador de erro. Se o indicador de erro não estiver definido, não haverá efeito.

void `PyErr_PrintEx`(int set_sys_last_vars)

  Print a standard traceback to `sys.stderr` and clear the error indicator. Unless the error is a `SystemExit`. In that case the no traceback is printed and Python process will exit with the error code specified by the `SystemExit` instance.

  Chame esta função apenas quando o indicador de erro está definido. Caso contrário, causará um erro fatal!

  If set_sys_last_vars is nonzero, the variables `sys.last_type`, `sys.last_value` and `sys.last_traceback` will be set to the type, value and traceback of the printed exception, respectively.

void `PyErr_Print`()

  Alias para``PyErr_PrintEx(1)``.

void `PyErr_WriteUnraisable`(PyObject *obj)

  This utility function prints a warning message to `sys.stderr` when an exception has been set but it is impossible for the interpreter to actually raise the exception. It is used, for example, when an exception occurs in an `__del__()` method.

  The function is called with a single argument obj that identifies the context in which the unraisable exception occurred. If possible, the repr of obj will be printed in the warning message.

  Uma exceção deve ser definida ao chamar essa função.

## Lançando exceções

Essas funções ajudam a definir o indicador de erro do thread. Por conveniência, algumas dessas funções sempre retornam um ponteiro `NULL` ao usar instrução com `return`.

void `PyErr_SetString`(PyObject *type, const char *message)

  This is the most common way to set the error indicator. The first argument specifies the exception type; it is normally one of the standard exceptions, e.g. `PyExc_RuntimeError`. You need not increment its reference count. The second argument is an error message; it is decoded from `'utf-8`’.

void `PyErr_SetObject`(PyObject *type, PyObject *value)

  Essa função é semelhante à `PyErr_SetString()` mas permite especificar um objeto Python arbitrário para o valor da exceção.

PyObject* `PyErr_Format`(PyObject *exception, const char *format, ...)
  Return value: Always NULL.

  This function sets the error indicator and returns `NULL`. exception should be a Python exception class. The format and subsequent parameters help format the error message; they have the same meaning and values as in `PyUnicode_FromFormat()`. format is an ASCII-encoded string.

PyObject* `PyErr_FormatV`(PyObject *exception, const char *format, va_list vargs)
  Return value: Always NULL.

  Igual a `PyErr_Format()`, mas usando o argumento `va_list` em vez de um número variável de argumentos.

  Novo na versão 3.5.

void `PyErr_SetNone`(PyObject *type)

  Isso é uma abreviação para `PyErr_SetObject(type, Py_None)`.

int `PyErr_BadArgument`()

  This is a shorthand for `PyErr_SetString(PyExc_TypeError, message)`, where message indicates that a built-in operation was invoked with an illegal argument. It is mostly for internal use.

PyObject* `PyErr_NoMemory`()
  Return value: Always NULL.

  Essa é uma abreviação para `PyErr_SetNone(PyExc_MemoryError)`; que retorna `NULL` para que uma função de aloção de objeto possa escrever `return PyErr_NoMemory();` quando ficar sem memória.

PyObject* `PyErr_SetFromErrno`(PyObject *type)
  Return value: Always NULL.

  This is a convenience function to raise an exception when a C library function has returned an error and set the C variable `errno`. It constructs a tuple object whose first item is the integer `errno` value and whose second item is the corresponding error message (gotten from `strerror()`), and then calls `PyErr_SetObject(type, object)`. On Unix, when the `errno` value is `EINTR`, indicating an interrupted system call, this calls `PyErr_CheckSignals()`, and if that set the error indicator, leaves it set to that. The function always returns `NULL`, so a wrapper function around a system call can write `return PyErr_SetFromErrno(type);` when the system call returns an error.

PyObject* `PyErr_SetFromErrnoWithFilenameObject`(PyObject *type, PyObject *filenameObject)
  Return value: Always NULL.

  Similar to `PyErr_SetFromErrno()`, with the additional behavior that if filenameObject is not `NULL`, it is passed to the constructor of type as a third parameter. In the case of `OSError` exception, this is used to define the `filename` attribute of the exception instance.

PyObject* `PyErr_SetFromErrnoWithFilenameObjects`(PyObject *type, PyObject *filenameObject, PyObject *filenameObject2)
  Return value: Always NULL.

  Similar to `PyErr_SetFromErrnoWithFilenameObject()`, but takes a second filename object, for raising errors when a function that takes two filenames fails.

  Novo na versão 3.4.

PyObject* `PyErr_SetFromErrnoWithFilename`(PyObject *type, const char *filename)
  Return value: Always NULL.

  Similar to `PyErr_SetFromErrnoWithFilenameObject()`, but the filename is given as a C string. filename is decoded from the filesystem encoding (`os.fsdecode()`).

PyObject* `PyErr_SetFromWindowsErr`(int ierr)
  Return value: Always NULL.

  This is a convenience function to raise `WindowsError`. If called with ierr of `0`, the error code returned by a call to `GetLastError()` is used instead. It calls the Win32 function `FormatMessage()` to retrieve the Windows description of error code given by ierr or `GetLastError()`, then it constructs a tuple object whose first item is the ierr value and whose second item is the corresponding error message (gotten from `FormatMessage()`), and then calls `PyErr_SetObject(PyExc_WindowsError, object)`. This function always returns `NULL`.

  Disponibilidade: Windows.

PyObject* `PyErr_SetExcFromWindowsErr`(PyObject *type, int ierr)
  Return value: Always NULL.

  Similar to `PyErr_SetFromWindowsErr()`, with an additional parameter specifying the exception type to be raised.

  Disponibilidade: Windows.

PyObject* `PyErr_SetFromWindowsErrWithFilename`(int ierr, const char *filename)
  Return value: Always NULL.

  Similar à `PyErr_SetFromWindowsErrWithFilenameObject()`, mas o nome do arquivo é dados como uma String C. O nome do arquivo é decodificado a partir do sistema de arquivos (`os.fsdecode()`).

  Disponibilidade: Windows.

PyObject* `PyErr_SetExcFromWindowsErrWithFilenameObject`(PyObject *type, int ierr, PyObject *filename)
  Return value: Always NULL.

  Similar to `PyErr_SetFromWindowsErrWithFilenameObject()`, with an additional parameter specifying the exception type to be raised.

  Disponibilidade: Windows.

PyObject* `PyErr_SetExcFromWindowsErrWithFilenameObjects`(PyObject *type, int ierr, PyObject *filename, PyObject *filename2)
  Return value: Always NULL.

  Similar à `PyErr_SetExcFromWindowsErrWithFilenameObject()`, mas aceita um segundo caminho do objeto.

  Disponibilidade: Windows.

  Novo na versão 3.4.

PyObject* `PyErr_SetExcFromWindowsErrWithFilename`(PyObject *type, int ierr, const char *filename)
  Return value: Always NULL.

  Similar à `PyErr_SetFromWindowsErrWithFilename()`, com um parâmetro adicional especificando o tipo de exceção a ser gerado.

  Disponibilidade: Windows.

PyObject* `PyErr_SetImportError`(PyObject *msg, PyObject *name, PyObject *path)
  Return value: Always NULL.

  This is a convenience function to raise `ImportError`. msg will be set as the exception’s message string. name and path, both of which can be `NULL`, will be set as the `ImportError`’s respective `name` and `path` attributes.

  Novo na versão 3.3.

void `PyErr_SyntaxLocationObject`(PyObject *filename, int lineno, int col_offset)

  Set file, line, and offset information for the current exception. If the current exception is not a `SyntaxError`, then it sets additional attributes, which make the exception printing subsystem think the exception is a `SyntaxError`.

  Novo na versão 3.4.

void `PyErr_SyntaxLocationEx`(const char *filename, int lineno, int col_offset)

  Like `PyErr_SyntaxLocationObject()`, but filename is a byte string decoded from the filesystem encoding (`os.fsdecode()`).

  Novo na versão 3.2.

void `PyErr_SyntaxLocation`(const char *filename, int lineno)

  Como `PyErr_SyntaxLocationEx()`, mas o parâmetro col_offset é omitido.

void `PyErr_BadInternalCall`()

  This is a shorthand for `PyErr_SetString(PyExc_SystemError, message)`, where message indicates that an internal operation (e.g. a Python/C API function) was invoked with an illegal argument. It is mostly for internal use.

## Emitindo advertências

Use these functions to issue warnings from C code. They mirror similar functions exported by the Python `warnings` module. They normally print a warning message to sys.stderr; however, it is also possible that the user has specified that warnings are to be turned into errors, and in that case they will raise an exception. It is also possible that the functions raise an exception because of a problem with the warning machinery. The return value is `0` if no exception is raised, or `-1` if an exception is raised. (It is not possible to determine whether a warning message is actually printed, nor what the reason is for the exception; this is intentional.) If an exception is raised, the caller should do its normal exception handling (for example, `Py_DECREF()` owned references and return an error value).

int `PyErr_WarnEx`(PyObject *category, const char *message, Py_ssize_t stack_level)

  Issue a warning message. The category argument is a warning category (see below) or `NULL`; the message argument is a UTF-8 encoded string. stack_level is a positive number giving a number of stack frames; the warning will be issued from the currently executing line of code in that stack frame. A stack_level of 1 is the function calling `PyErr_WarnEx()`, 2 is the function above that, and so forth.

  Warning categories must be subclasses of `PyExc_Warning`; `PyExc_Warning` is a subclass of `PyExc_Exception`; the default warning category is `PyExc_RuntimeWarning`. The standard Python warning categories are available as global variables whose names are enumerated at Categorias de aviso padrão.

  For information about warning control, see the documentation for the `warnings` module and the `-W` option in the command line documentation. There is no C API for warning control.

PyObject* `PyErr_SetImportErrorSubclass`(PyObject *exception, PyObject *msg, PyObject *name, PyObject *path)
  Return value: Always NULL.

  Muito parecido com `PyErr_SetImportError()` mas a função permite especificar uma subclasse de `ImportError` para levantar uma exceção.

  Novo na versão 3.6.

int `PyErr_WarnExplicitObject`(PyObject *category, PyObject *message, PyObject *filename, int lineno, PyObject *module, PyObject *registry)

  Issue a warning message with explicit control over all warning attributes. This is a straightforward wrapper around the Python function `warnings.warn_explicit()`, see there for more information. The module and registry arguments may be set to `NULL` to get the default effect described there.

  Novo na versão 3.4.

int `PyErr_WarnExplicit`(PyObject *category, const char *message, const char *filename, int lineno, const char *module, PyObject *registry)

  Similar to `PyErr_WarnExplicitObject()` except that message and module are UTF-8 encoded strings, and filename is decoded from the filesystem encoding (`os.fsdecode()`).

int `PyErr_WarnFormat`(PyObject *category, Py_ssize_t stack_level, const char *format, ...)

  Function similar to `PyErr_WarnEx()`, but use `PyUnicode_FromFormat()` to format the warning message. format is an ASCII-encoded string.

  Novo na versão 3.2.

int `PyErr_ResourceWarning`(PyObject *source, Py_ssize_t stack_level, const char *format, ...)

  Function similar to `PyErr_WarnFormat()`, but category is `ResourceWarning` and it passes source to `warnings.WarningMessage()`.

  Novo na versão 3.6.

## Consultando o indicador de erro

PyObject* `PyErr_Occurred`()
  Return value: Borrowed reference.

  Test whether the error indicator is set. If set, return the exception type (the first argument to the last call to one of the `PyErr_Set*()` functions or to `PyErr_Restore()`). If not set, return `NULL`. You do not own a reference to the return value, so you do not need to `Py_DECREF()` it.

  Nota

  Do not compare the return value to a specific exception; use `PyErr_ExceptionMatches()` instead, shown below. (The comparison could easily fail since the exception may be an instance instead of a class, in the case of a class exception, or it may be a subclass of the expected exception.)

int `PyErr_ExceptionMatches`(PyObject *exc)

  Equivalent to `PyErr_GivenExceptionMatches(PyErr_Occurred(), exc)`. This should only be called when an exception is actually set; a memory access violation will occur if no exception has been raised.

int `PyErr_GivenExceptionMatches`(PyObject *given, PyObject *exc)

  Return true if the given exception matches the exception type in exc. If exc is a class object, this also returns true when given is an instance of a subclass. If exc is a tuple, all exception types in the tuple (and recursively in subtuples) are searched for a match.

void `PyErr_Fetch`(PyObject **ptype, PyObject **pvalue, PyObject **ptraceback)

  Retrieve the error indicator into three variables whose addresses are passed. If the error indicator is not set, set all three variables to `NULL`. If it is set, it will be cleared and you own a reference to each object retrieved. The value and traceback object may be `NULL` even when the type object is not.

  Nota

  Esta função, normalmente, é usada apenas pelo código que precisa capturar exceções ou pelo código que precisa salvar e restaurar temporariamente o indicador de erros.

      {
         PyObject *type, *value, *traceback;
         PyErr_Fetch(&type, &value, &traceback);

         /* ... code that might produce other errors ... */

         PyErr_Restore(type, value, traceback);
      }

void `PyErr_Restore`(PyObject *type, PyObject *value, PyObject *traceback)

  Set the error indicator from the three objects. If the error indicator is already set, it is cleared first. If the objects are `NULL`, the error indicator is cleared. Do not pass a `NULL` type and non-`NULL` value or traceback. The exception type should be a class. Do not pass an invalid exception type or value. (Violating these rules will cause subtle problems later.) This call takes away a reference to each object: you must own a reference to each object before the call and after the call you no longer own these references. (If you don’t understand this, don’t use this function. I warned you.)

  Nota

  This function is normally only used by code that needs to save and restore the error indicator temporarily. Use `PyErr_Fetch()` to save the current error indicator.

void `PyErr_NormalizeException`(PyObject**exc, PyObject**val, PyObject**tb)

  Under certain circumstances, the values returned by `PyErr_Fetch()` below can be “unnormalized”, meaning that `*exc` is a class object but `*val` is not an instance of the same class. This function can be used to instantiate the class in that case. If the values are already normalized, nothing happens. The delayed normalization is implemented to improve performance.

  Nota

  This function does not implicitly set the `__traceback__` attribute on the exception value. If setting the traceback appropriately is desired, the following additional snippet is needed:

      if (tb != NULL) {
        PyException_SetTraceback(val, tb);
      }

void `PyErr_GetExcInfo`(PyObject **ptype, PyObject **pvalue, PyObject **ptraceback)

  Retrieve the exception info, as known from `sys.exc_info()`. This refers to an exception that was already caught, not to an exception that was freshly raised. Returns new references for the three objects, any of which may be `NULL`. Does not modify the exception info state.

  Nota

  This function is not normally used by code that wants to handle exceptions. Rather, it can be used when code needs to save and restore the exception state temporarily. Use `PyErr_SetExcInfo()` to restore or clear the exception state.

  Novo na versão 3.3.

void `PyErr_SetExcInfo`(PyObject *type, PyObject *value, PyObject *traceback)

  Set the exception info, as known from `sys.exc_info()`. This refers to an exception that was already caught, not to an exception that was freshly raised. This function steals the references of the arguments. To clear the exception state, pass `NULL` for all three arguments. For general rules about the three arguments, see `PyErr_Restore()`.

  Nota

  This function is not normally used by code that wants to handle exceptions. Rather, it can be used when code needs to save and restore the exception state temporarily. Use `PyErr_GetExcInfo()` to read the exception state.

  Novo na versão 3.3.

## Tratamento de sinal

int `PyErr_CheckSignals`()

  This function interacts with Python’s signal handling. It checks whether a signal has been sent to the processes and if so, invokes the corresponding signal handler. If the `signal` module is supported, this can invoke a signal handler written in Python. In all cases, the default effect for `SIGINT` is to raise the `KeyboardInterrupt` exception. If an exception is raised the error indicator is set and the function returns `-1`; otherwise the function returns `0`. The error indicator may or may not be cleared if it was previously set.

void `PyErr_SetInterrupt`()

  Simulate the effect of a `SIGINT` signal arriving. The next time `PyErr_CheckSignals()` is called, the Python signal handler for `SIGINT` will be called.

  If `SIGINT` isn’t handled by Python (it was set to `signal.SIG_DFL` or `signal.SIG_IGN`), this function does nothing.

int `PySignal_SetWakeupFd`(int fd)

  This utility function specifies a file descriptor to which the signal number is written as a single byte whenever a signal is received. fd must be non-blocking. It returns the previous such file descriptor.

  O valor `-1` desabilita o recurso; este é o estado inicial. Isso é equivalente à `signal.set_wakeup_fd()` em Python, mas sem nenhuma verificação de erro. fd deve ser um descritor de arquivo válido. A função só deve ser chamada a partir da thread principal.

  Alterado na versão 3.5: No Windows, a função agora também suporta manipuladores de socket.

## Classes de exceção

PyObject* `PyErr_NewException`(const char *name, PyObject *base, PyObject *dict)
  Return value: New reference.

  This utility function creates and returns a new exception class. The name argument must be the name of the new exception, a C string of the form `module.classname`. The base and dict arguments are normally `NULL`. This creates a class object derived from `Exception` (accessible in C as `PyExc_Exception`).

  The `__module__` attribute of the new class is set to the first part (up to the last dot) of the name argument, and the class name is set to the last part (after the last dot). The base argument can be used to specify alternate base classes; it can either be only one class or a tuple of classes. The dict argument can be used to specify a dictionary of class variables and methods.

PyObject* `PyErr_NewExceptionWithDoc`(const char *name, const char *doc, PyObject *base, PyObject *dict)
  Return value: New reference.

  Same as `PyErr_NewException()`, except that the new exception class can easily be given a docstring: If doc is non-`NULL`, it will be used as the docstring for the exception class.

  Novo na versão 3.2.

## Objeto Exception

PyObject* `PyException_GetTraceback`(PyObject *ex)
  Return value: New reference.

  Return the traceback associated with the exception as a new reference, as accessible from Python through `__traceback__`. If there is no traceback associated, this returns `NULL`.

int `PyException_SetTraceback`(PyObject *ex, PyObject *tb)

  Defina o retorno traceback (situação da pilha de execução) associado à exceção como tb. Use `Py_None` para limpá-lo.

PyObject* `PyException_GetContext`(PyObject *ex)
  Return value: New reference.

  Return the context (another exception instance during whose handling ex was raised) associated with the exception as a new reference, as accessible from Python through `__context__`. If there is no context associated, this returns `NULL`.

void `PyException_SetContext`(PyObject *ex, PyObject *ctx)

  Set the context associated with the exception to ctx. Use `NULL` to clear it. There is no type check to make sure that ctx is an exception instance. This steals a reference to ctx.

PyObject* `PyException_GetCause`(PyObject *ex)
  Return value: New reference.

  Return the cause (either an exception instance, or `None`, set by `raise ... from ...`) associated with the exception as a new reference, as accessible from Python through `__cause__`.

void `PyException_SetCause`(PyObject *ex, PyObject *cause)

  Set the cause associated with the exception to cause. Use `NULL` to clear it. There is no type check to make sure that cause is either an exception instance or `None`. This steals a reference to cause.

  `__suppress_context__` para essa função é definido `True` , implicitamente.

## Objetos de exceção Unicode

As seguintes funções são usadas para criar e modificar exceções Unicode de C.

PyObject* `PyUnicodeDecodeError_Create`(const char *encoding, const char *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
  Return value: New reference.

  Create a `UnicodeDecodeError` object with the attributes encoding, object, length, start, end and reason. encoding and reason are UTF-8 encoded strings.

PyObject* `PyUnicodeEncodeError_Create`(const char *encoding, const Py_UNICODE *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
  Return value: New reference.

  Create a `UnicodeEncodeError` object with the attributes encoding, object, length, start, end and reason. encoding and reason are UTF-8 encoded strings.

PyObject* `PyUnicodeTranslateError_Create`(const Py_UNICODE *object, Py_ssize_t length, Py_ssize_t start, Py_ssize_t end, const char *reason)
  Return value: New reference.

  Create a `UnicodeTranslateError` object with the attributes object, length, start, end and reason. reason is a UTF-8 encoded string.

PyObject* `PyUnicodeDecodeError_GetEncoding`(PyObject *exc)
PyObject* `PyUnicodeEncodeError_GetEncoding`(PyObject *exc)
  Return value: New reference.

  Retorna o atributo * encoding* do objeto dado na exceção.

PyObject* `PyUnicodeDecodeError_GetObject`(PyObject *exc)
PyObject* `PyUnicodeEncodeError_GetObject`(PyObject *exc)
PyObject* `PyUnicodeTranslateError_GetObject`(PyObject *exc)
  Return value: New reference.

  Retorna o atributo * object * do objeto dado na exceção.

int `PyUnicodeDecodeError_GetStart`(PyObject *exc, Py_ssize_t *start)
int `PyUnicodeEncodeError_GetStart`(PyObject *exc, Py_ssize_t *start)
int `PyUnicodeTranslateError_GetStart`(PyObject *exc, Py_ssize_t *start)

  Obtenha o atributo start do objeto da exceção coloque-o em *start. start must notnão deve ser `NULL`. Retorna `0` se não der erro, `-1` caso dê erro..

int `PyUnicodeDecodeError_SetStart`(PyObject *exc, Py_ssize_t start)
int `PyUnicodeEncodeError_SetStart`(PyObject *exc, Py_ssize_t start)
int `PyUnicodeTranslateError_SetStart`(PyObject *exc, Py_ssize_t start)

  Defina o atributo start dado no objeto de exceção start. Em caso de sucesso, retorna `0`, em caso de falha, retorna `-1`.

int `PyUnicodeDecodeError_GetEnd`(PyObject *exc, Py_ssize_t *end)
int `PyUnicodeEncodeError_GetEnd`(PyObject *exc, Py_ssize_t *end)
int `PyUnicodeTranslateError_GetEnd`(PyObject *exc, Py_ssize_t *end)

  Obtenha o atributo end dado no objeto de exceção e coloque *end. O end não deve ser `NULL`. Em caso de sucesso, retorna `0`, em caso de falha, retorna `-1`.

int `PyUnicodeDecodeError_SetEnd`(PyObject *exc, Py_ssize_t end)
int `PyUnicodeEncodeError_SetEnd`(PyObject *exc, Py_ssize_t end)
int `PyUnicodeTranslateError_SetEnd`(PyObject *exc, Py_ssize_t end)

  Set the end attribute of the given exception object to end. Return `0` on success, `-1` on failure.

PyObject* `PyUnicodeDecodeError_GetReason`(PyObject *exc)
PyObject* `PyUnicodeEncodeError_GetReason`(PyObject *exc)
PyObject* `PyUnicodeTranslateError_GetReason`(PyObject *exc)
  Return value: New reference.

  Retorna o atributo reason dado no objeto da exceção.

int `PyUnicodeDecodeError_SetReason`(PyObject *exc, const char *reason)
int `PyUnicodeEncodeError_SetReason`(PyObject *exc, const char *reason)
int `PyUnicodeTranslateError_SetReason`(PyObject *exc, const char *reason)

  Set the reason attribute of the given exception object to reason. Return `0` on success, `-1` on failure.

## Controle de recursão

These two functions provide a way to perform safe recursive calls at the C level, both in the core and in extension modules. They are needed if the recursive code does not necessarily invoke Python code (which tracks its recursion depth automatically).

int `Py_EnterRecursiveCall`(const char *where)

  Marca um ponto em que a chamada recursiva em nível C está prestes a ser executada.

  If `USE_STACKCHECK` is defined, this function checks if the OS stack overflowed using `PyOS_CheckStack()`. In this is the case, it sets a `MemoryError` and returns a nonzero value.

  The function then checks if the recursion limit is reached. If this is the case, a `RecursionError` is set and a nonzero value is returned. Otherwise, zero is returned.

  where should be a string such as `" in instance check"` to be concatenated to the `RecursionError` message caused by the recursion depth limit.

void `Py_LeaveRecursiveCall`()

  Ends a `Py_EnterRecursiveCall()`. Must be called once for each successful invocation of `Py_EnterRecursiveCall()`.

Properly implementing `tp_repr` for container types requires special recursion handling. In addition to protecting the stack, `tp_repr` also needs to track objects to prevent cycles. The following two functions facilitate this functionality. Effectively, these are the C equivalent to `reprlib.recursive_repr()`.

int `Py_ReprEnter`(PyObject *object)

  Chamado no início da implementação `tp_repr` para detectar ciclos.

  If the object has already been processed, the function returns a positive integer. In that case the `tp_repr` implementation should return a string object indicating a cycle. As examples, `dict` objects return `{...}` and `list` objects return `[...]`.

  A função retornará um inteiro negativo se o limite da recursão for atingido. Nesse caso a implementação `tp_repr` deverá, normalmente,. retornar `NULL`.

  Caso contrário, a função retorna zero e a implementação `tp_repr` poderá continuar normalmente.

void `Py_ReprLeave`(PyObject *object)

  Termina a `Py_ReprEnter()`. Deve ser chamado uma vez para cada chamada de `Py_ReprEnter()` que retorna zero.

## Exceções Padrão

All standard Python exceptions are available as global variables whose names are `PyExc_` followed by the Python exception name. These have the type `PyObject*`; they are all class objects. For completeness, here are all the variables:

C Name | Python Name | Notas
--- | --- | ---
`PyExc_BaseException` | `BaseException` | (1)
`PyExc_Exception` | `Exception` | (1)
`PyExc_ArithmeticError` | `ArithmeticError` | (1)
`PyExc_AssertionError` | `AssertionError` |
`PyExc_AttributeError` | `AttributeError` |
`PyExc_BlockingIOError` | `BlockingIOError` |
`PyExc_BrokenPipeError` | `BrokenPipeError` |
`PyExc_BufferError` | `BufferError` |
`PyExc_ChildProcessError` | `ChildProcessError` |
`PyExc_ConnectionAbortedError` | `ConnectionAbortedError` |
`PyExc_ConnectionError` | `ConnectionError` |
`PyExc_ConnectionRefusedError` | `ConnectionRefusedError` |
`PyExc_ConnectionResetError` | `ConnectionResetError` |
`PyExc_EOFError` | `EOFError` |
`PyExc_FileExistsError` | `FileExistsError` |
`PyExc_FileNotFoundError` | `FileNotFoundError` |
`PyExc_FloatingPointError` | `FloatingPointError` |
`PyExc_GeneratorExit` | `GeneratorExit` |
`PyExc_ImportError` | `ImportError` |
`PyExc_IndentationError` | `IndentationError` |
`PyExc_IndexError` | `IndexError` |
`PyExc_InterruptedError` | `InterruptedError` |
`PyExc_IsADirectoryError` | `IsADirectoryError` |
`PyExc_KeyError` | `KeyError` |
`PyExc_KeyboardInterrupt` | `KeyboardInterrupt` |
`PyExc_LookupError` | `LookupError` | (1)
`PyExc_MemoryError` | `MemoryError` |
`PyExc_ModuleNotFoundError` | `ModuleNotFoundError` |
`PyExc_NameError` | `NameError` |
`PyExc_NotADirectoryError` | `NotADirectoryError` |
`PyExc_NotImplementedError` | `NotImplementedError` |
`PyExc_OSError` | `OSError` | (1)
`PyExc_OverflowError` | `OverflowError` |
`PyExc_PermissionError` | `PermissionError` |
`PyExc_ProcessLookupError` | `ProcessLookupError` |
`PyExc_RecursionError` | `RecursionError` |
`PyExc_ReferenceError` | `ReferenceError` | (2)
`PyExc_RuntimeError` | `RuntimeError` |
`PyExc_StopAsyncIteration` | `StopAsyncIteration` |
`PyExc_StopIteration` | `StopIteration` |
`PyExc_SyntaxError` | `SyntaxError` |
`PyExc_SystemError` | `SystemError` |
`PyExc_SystemExit` | `SystemExit` |
`PyExc_TabError` | `TabError` |
`PyExc_TimeoutError` | `TimeoutError` |
`PyExc_TypeError` | `TypeError` |
`PyExc_UnboundLocalError` | `UnboundLocalError` |
`PyExc_UnicodeDecodeError` | `UnicodeDecodeError` |
`PyExc_UnicodeEncodeError` | `UnicodeEncodeError` |
`PyExc_UnicodeError` | `UnicodeError` |
`PyExc_UnicodeTranslateError` | `UnicodeTranslateError` |
`PyExc_ValueError` | `ValueError` |
`PyExc_ZeroDivisionError` | `ZeroDivisionError` |

Novo na versão 3.3: `PyExc_BlockingIOError`, `PyExc_BrokenPipeError`, `PyExc_ChildProcessError`, `PyExc_ConnectionError`, `PyExc_ConnectionAbortedError`, `PyExc_ConnectionRefusedError`, `PyExc_ConnectionResetError`, `PyExc_FileExistsError`, `PyExc_FileNotFoundError`, `PyExc_InterruptedError`, `PyExc_IsADirectoryError`, `PyExc_NotADirectoryError`, `PyExc_PermissionError`, `PyExc_ProcessLookupError` and `PyExc_TimeoutError` were introduced following PEP 3151.

Novo na versão 3.5: `PyExc_StopAsyncIteration` and `PyExc_RecursionError`.

Novo na versão 3.6: `PyExc_ModuleNotFoundError`.

Esses são os aliases compatíveis para `PyExc_OSError`:

C Name | Notas
--- | ---
`PyExc_EnvironmentError` |
`PyExc_IOError` |
`PyExc_WindowsError` | (3)

Alterado na versão 3.3: Esses aliases costumavam ser tipos de exceção separados.

Notas:

1. Esta é uma classe base para outras exceções padrão.

2. Defina apenas no Windows; proteja o código que usa isso testando se a macro do pré-processador `MS_WINDOWS` está definida.

## Categorias de aviso padrão

All standard Python warning categories are available as global variables whose names are `PyExc_` followed by the Python exception name. These have the type `PyObject*`; they are all class objects. For completeness, here are all the variables:

C Name | Python Name | Notas
--- | --- | ---
`PyExc_Warning` | `Warning` | (1)
`PyExc_BytesWarning` | `BytesWarning` |
`PyExc_DeprecationWarning` | `DeprecationWarning` |
`PyExc_FutureWarning` | `FutureWarning` |
`PyExc_ImportWarning` | `ImportWarning` |
`PyExc_PendingDeprecationWarning` | `PendingDeprecationWarning` |
`PyExc_ResourceWarning` | `ResourceWarning` |
`PyExc_RuntimeWarning` | `RuntimeWarning` |
`PyExc_SyntaxWarning` | `SyntaxWarning` |
`PyExc_UnicodeWarning` | `UnicodeWarning` |
`PyExc_UserWarning` | `UserWarning` |

Novo na versão 3.2: `PyExc_ResourceWarning`.

Notas:

1. Esta é uma classe base para outras categorias de aviso padrão.