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The "#!" line in all scan-build-py scripts were using just bare "/usr/bin/python" which according to PEP-0394 can be either python3, python2 or not exist at all. E.g in latest debian and ubuntu releases "/usr/bin/python" does not exist at all by default and user must install python-is-python2 or python-is-python3 packages to get the bare version less "python" command. Until recently (70b06fe8a186 "scan-build-py: Force the opening in utf-8" changed "libscanbuild") these scripts worked in both python2 and python3, but now they (rightfully) are python3 only, and broke on systems where the "python" command means python2. By changing the "#!" to be "python3" it is not only explicit that the scripts require python3 it also works on systems where "python" command is python2 or nonexistent. Differential Revision: https://reviews.llvm.org/D126804