global: use python3 in shebangs Python 3 is the future. We want Python scripts to be using Python 3 by default. This change updates all `#!/usr/bin/env python` shebangs to use `python3`. Does this mean all scripts use or require Python 3: no. In the test environment, the `PATH` environment variable in tests is updated to guarantee that the Python executable used to run run-tests.py is used. Since test scripts all now use `#!/usr/bin/env python3`, we had to update this code to install a `python3` symlink instead of `python`. It is possible there are some random scripts now executed with the incorrect Python interpreter in some contexts. However, I would argue that this was a pre-existing bug: we should almost always be executing new Python processes using the `sys.executable` from the originating Python script, as `python` or `python3` won't guarantee we'll use the same interpreter. Differential Revision: https://phab.mercurial-scm.org/D9273

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#!/usr/bin/env python3

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#

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# Based on python's Tools/scripts/md5sum.py

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#

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# This software may be used and distributed according to the terms

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# of the PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2, which is

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# GPL-compatible.

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from __future__ import absolute_import

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import hashlib

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import os

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import sys

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try:

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    import msvcrt

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    msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)

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    msvcrt.setmode(sys.stderr.fileno(), os.O_BINARY)

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except ImportError:

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    pass

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for filename in sys.argv[1:]:

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    try:

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        fp = open(filename, 'rb')

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    except IOError as msg:

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        sys.stderr.write('%s: Can\'t open: %s\n' % (filename, msg))

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        sys.exit(1)

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    m = hashlib.md5()

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    try:

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        for data in iter(lambda: fp.read(8192), b''):

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            m.update(data)

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    except IOError as msg:

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        sys.stderr.write('%s: I/O error: %s\n' % (filename, msg))

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        sys.exit(1)

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    sys.stdout.write('%s  %s\n' % (m.hexdigest(), filename))

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sys.exit(0)