Inada Naoki <songofaca...@gmail.com> added the comment:
In your code, huge data passed to .write(huge) may be remained in the internal
buffer.
```
[NEW PRE-FLUSH]
else if ((self->pending_bytes_count + bytes_len) > self->chunk_size) {
if (_textiowrapper_writeflush(self) < 0) {
Py_DECREF(b);
return NULL;
}
self->pending_bytes = b;
}
(snip)
self->pending_bytes_count += bytes_len;
if (self->pending_bytes_count > self->chunk_size || needflush ||
text_needflush) {
if (_textiowrapper_writeflush(self) < 0)
return NULL;
}
```
In my opinion, when .write(huge) fails with MemoryError, TextIOWrapper must not
keep the `huge` in the internal buffer.
See my PR-24592.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43260>
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