Dan Halbert <halb...@halwitz.org> added the comment:
Fix tested and works! Comment from PR duplicated here.
I tested this fix by editing the 3.7.3 IDLE code by hand, and editing this test
program as code.py on a CIRCUITPY drive on Windows 10:
import time
i = 0
while True:
print(i)
i += 1
print("""\
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890
""")
time.sleep(1)
I typically test write flushing by editing a short program like this, and
duplicating the print lines so that the size of the program grows by >512
bytes. This forces a rewrite of the FAT12 information because the program has
increased in size by one or more filesystem blocks. Then I shrink it back down
again. If file flushing doesn't happen immediately, the program will often
throw a syntax error (because it's missing some blocks), or CircuitPython will
get an I/O error, which is what happened before I patched IDLE.
So this looks good!
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<https://bugs.python.org/issue36807>
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