As documentation about "truncate" says, "The current stream position isn’t changed." This is true for most cases. But this is not true for "wtf1.py" example. If you run it with Linux (Tested Debian 8 and Arch; Windows was not tested by me) and Python 3.3+ (or with Python 2.7 using backported "io" module), then these lines:
New changeset 059f58c by Antoine Pitrou (Nitish Chandra) in branch 'master': bpo-32228: Reset raw_pos after unwinding the raw stream (bpo-4858) 059f58c
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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