My script looks like this:
f = open('myfile', 'a+b')
f.write(b'abcde')
And I also add a `printf` statement in the _io_BufferedWriter_write_impl
<https://github.com/python/cpython/blob/ada319bb6d0ebcc68d3e0ef2b4279ea061877ac8/Modules/_io/bufferedio.c#L1910>
function.
static PyObject * _io_BufferedWriter_write_impl(buffered *self,
Py_buffer *buffer)
/*[clinic end generated code: output=7f8d1365759bfc6b
input=dd87dd85fc7f8850]*/
{
printf("call write_impl\n");
PyObject *res = NULL;
Py_ssize_t written, avail, remaining;
Py_off_t offset;
...
After I compiled then run my script. I found _io_BufferedWriter_write_impl
<https://github.com/python/cpython/blob/ada319bb6d0ebcc68d3e0ef2b4279ea061877ac8/Modules/_io/bufferedio.c#L1910>
had
been called twice which I expected only once. The second time it changed
self->pos to an unexpected value too.
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