I have some questions about the IO modules.
1. My script:
f = open('myfile, 'a+b')
f.close()
I added a printf statement at the beginning of _io_open_impl
<https://github.com/python/cpython/blob/master/Modules/_io/_iomodule.c#L233>,
the output is:
_io_open
_io_open
_io_open
_io_open
_io_open
Why this function has been called more than one time? I expect this
function only let us call the `open()` system call once.
2. I'm not familiar with the C, How the c-api like
PyObject_CallMethodObjArgs(self->raw,
_PyIO_str_write, memobj, NULL)
<https://github.com/python/cpython/blob/master/Modules/_io/bufferedio.c#L1818>
works?
I guess this function will finally call the `write()` system call but I
don't know why it would work. I found `self->raw` is an empty PyObject and
`_PyIO_str_write` is a global variable which is NULL. Why an empty
PyObject have a write method? Why we didn't just use `write()` system call
directly?
Thank you so much :D
Best,
Windson
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