examples/gettingData.py: Problem writing large files

[C14L]

Possibly a bug in the "gettingData.py" example, when writing large files with more than one obj in chunk['ObjectList'].

ds3_python3_sdk/samples/gettingData.py

Line 83 in 426e836

objectStream = open(objectNameToDestinationPathMap[obj['Name']], "wb")

Opening the target file with "wb" would truncate it, before seek() moves the pointer to the write position. The result is a file that contains only NUL bytes except for the last obj block written.

A fix would be to open the file in "r+b" more, that is both seek-able and write-able without truncating.

pathlib.Path(objectNameToDestinationPathMap[obj['Name']]).touch()  # ensure file exists
objectStream = open(objectNameToDestinationPathMap[obj['Name']], "r+b")

[RachelTucker]

Fixed in #60