Does Python Automatically Flush Its Buffer When Calling Seek And/or Read Operations Following A Write?

Let's say I write the following python code: file = open('test.txt','w+') file.write('hi') file.seek(0) file.read() The second line tells Python that I want to write 'hi' to file.

Solution 1:

For specifically CPython, for buffered IO seek calls the _io__Buffered_seek_impl which is guaranteed to flush if and only if the whence argument is set to SEEK_END (2)

read with zero arguments calls _bufferedreader_read_all through _io__Buffered_read_impl, which does flush.