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For those who find this in the future, the simplest workaround for the:
for line in sys.stdin:
issue on Python 2 is to replace it with:
for line in iter(sys.stdin.readline, ''):
The problem is caused by the way file.__next__'s buffering behaves, but file.readline doesn't use that code (it delegates to either fgets or a loop over getc/getc_unlocked that never overbuffers beyond the newline). Two-arg iter lets you make an iterator that calls readline each time you want a line, and considers a return of '' (which is what readline returns when you hit EOF) to terminate iteration.