4 examples of 'convert python 3.6 to exe' in Python

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def python(command, env=None, version='2.7'):
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    if env:
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        env = ' '.join(
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            '{}={}'.format(k, v) for k, v in env.items()
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        ) + ' '
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    else:
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        env = ''
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    return '{}{}{} {}'.format(env, PYTHON_BIN, version, command)

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def find_python_executable(python_major):
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    # type: (int) -> str
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    """
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    Find the relevant python executable that is of the given python major version.
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    Will test, in decreasing priority order:
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    * the current Python interpreter
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    * 'pythonX' executable in PATH (with X the given major version) if available
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    * 'python' executable in PATH if available
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    * Windows Python launcher 'py' executable in PATH if available
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    Incompatible python versions for Certbot will be evicted (eg. Python < 3.5 on Windows)
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    :param int python_major: the Python major version to target (2 or 3)
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    :rtype: str
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    :return: the relevant python executable path
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    :raise RuntimeError: if no relevant python executable path could be found
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    """
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    python_executable_path = None
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    # First try, current python executable
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    if _check_version('{0}.{1}.{2}'.format(
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            sys.version_info[0], sys.version_info[1], sys.version_info[2]), python_major):
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        return sys.executable
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    # Second try, with python executables in path
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    versions_to_test = ['2.7', '2', ''] if python_major == 2 else ['3', '']
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    for one_version in versions_to_test:
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        try:
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            one_python = 'python{0}'.format(one_version)
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            output = subprocess.check_output([one_python, '--version'],
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                                             universal_newlines=True, stderr=subprocess.STDOUT)
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            if _check_version(output.strip().split()[1], python_major):
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                return subprocess.check_output([one_python, '-c',
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                                                'import sys; sys.stdout.write(sys.executable);'],
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                                               universal_newlines=True)
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        except (subprocess.CalledProcessError, OSError):
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            pass
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    # Last try, with Windows Python launcher
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    try:
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        env_arg = '-{0}'.format(python_major)
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        output_version = subprocess.check_output(['py', env_arg, '--version'],
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                                                 universal_newlines=True, stderr=subprocess.STDOUT)
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        if _check_version(output_version.strip().split()[1], python_major):
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            return subprocess.check_output(['py', env_arg, '-c',
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                                            'import sys; sys.stdout.write(sys.executable);'],
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                                           universal_newlines=True)
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    except (subprocess.CalledProcessError, OSError):
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        pass
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    if not python_executable_path:
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        raise RuntimeError('Error, no compatible Python {0} executable for Certbot could be found.'
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                           .format(python_major))

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def python_switcher(python_exec: str, python_file: str, args: list):
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    '''
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    Switch to the right python
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    '''
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    if not os.getpid() - os.getppid() == 1:
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        subprocess.call(['%s %s %s' % (python_exec, python_file, ' '.join(args))], shell=True)
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    else:
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        sys.exit(1)

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def exe():
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    return (os.environ.get('BUP_MAIN_EXE') or
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            os.path.join(startdir, sys.argv[0]))