Python’s built-in file objects are implemented entirely on the FILE* support from the C standard library. This is an implementation detail and may change in future releases of Python.
此实例的 PyTypeObject represents the Python file type. This is exposed to Python programs as file and types.FileType .
返回 True 若其自变量是 PyFileObject 或子类型的 PyFileObject .
2.2 版改变： Allowed subtypes to be accepted.
返回 True 若其自变量是 PyFileObject ，但不是子类型的 PyFileObject .
2.2 版新增。
On success, return a new file object that is opened on the file given by filename , with a file mode given by mode ，其中 mode has the same semantics as the standard C routine fopen() . On failure, return NULL .
创建新的 PyFileObject from the already-open standard C file pointer, fp . The function close will be called when the file should be closed. Return NULL and close the file using close 当故障时。 close is optional and can be set to NULL .
Return the file object associated with p 作为 FILE* .
If the caller will ever use the returned FILE* object while the GIL is released it must also call the PyFile_IncUseCount() and PyFile_DecUseCount() functions described below as appropriate.
Increments the PyFileObject’s internal use count to indicate that the underlying FILE* is being used. This prevents Python from calling f_close() on it from another thread. Callers of this must call PyFile_DecUseCount() when they are finished with the FILE* . Otherwise the file object will never be closed by Python.
The GIL must be held while calling this function.
The suggested use is to call this after PyFile_AsFile() and before you release the GIL:
FILE *fp = PyFile_AsFile(p); PyFile_IncUseCount(p); /* ... */ Py_BEGIN_ALLOW_THREADS do_something(fp); Py_END_ALLOW_THREADS /* ... */ PyFile_DecUseCount(p);
2.6 版新增。
Decrements the PyFileObject’s internal unlocked_count member to indicate that the caller is done with its own use of the FILE* . This may only be called to undo a prior call to PyFile_IncUseCount() .
The GIL must be held while calling this function (see the example above).
2.6 版新增。
相当于 p.readline([n]) , this function reads one line from the object p . p may be a file object or any object with a readline() 方法。若 n is 0 , exactly one line is read, regardless of the length of the line. If n 大于 0 , no more than n bytes will be read from the file; a partial line can be returned. In both cases, an empty string is returned if the end of the file is reached immediately. If n 小于 0 , however, one line is read regardless of length, but EOFError is raised if the end of the file is reached immediately.
Return the name of the file specified by p as a string object.
Available on systems with setvbuf() only. This should only be called immediately after file object creation.
Set the file’s encoding for Unicode output to enc . Return 1 on success and 0 on failure.
2.3 版新增。
Set the file’s encoding for Unicode output to enc , and its error mode to err . Return 1 on success and 0 on failure.
2.6 版新增。
This function exists for internal use by the interpreter. Set the softspace attribute of p to newflag 并返回先前值。 p does not have to be a file object for this function to work properly; any object is supported (thought its only interesting if the softspace attribute can be set). This function clears any errors, and will return 0 as the previous value if the attribute either does not exist or if there were errors in retrieving it. There is no way to detect errors from this function, but doing so should not be needed.
