src/core/src/bootstrap/EnvLayer.py [143:184]:
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        def check_output(*popenargs, **kwargs):
            """ Backport from subprocess module from python 2.7 """
            if 'stdout' in kwargs:
                raise ValueError('stdout argument not allowed, it will be overridden.')

            no_output = False
            if type(popenargs[0]) is bool:
                no_output = popenargs[0]
                popenargs = popenargs[1:]

            if no_output is True:
                out_file = None
            else:
                out_file = subprocess.PIPE

            process = subprocess.Popen(stdout=out_file, *popenargs, **kwargs)
            output, unused_err = process.communicate()
            retcode = process.poll()

            if retcode:
                cmd = kwargs.get("args")
                if cmd is None:
                    cmd = popenargs[0]
                raise subprocess.CalledProcessError(retcode, cmd, output=output)
            return output

        # noinspection PyShadowingNames,PyShadowingNames
        class CalledProcessError(Exception):
            """Exception classes used by this module."""

            def __init__(self, return_code, cmd, output=None):
                self.return_code = return_code
                self.cmd = cmd
                self.output = output

            def __str__(self):
                return "Command '%s' returned non-zero exit status %d" \
                       % (self.cmd, self.return_code)

        subprocess.check_output = check_output
        subprocess.CalledProcessError = CalledProcessError
        try:
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src/extension/src/EnvLayer.py [52:95]:
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        def check_output(*popenargs, **kwargs):
            """
            Backport from subprocess module from python 2.7
            """
            if 'stdout' in kwargs:
                raise ValueError('stdout argument not allowed, it will be overridden.')

            no_output = False
            if type(popenargs[0]) is bool:
                no_output = popenargs[0]
                popenargs = popenargs[1:]

            if no_output is True:
                out_file = None
            else:
                out_file = subprocess.PIPE

            process = subprocess.Popen(stdout=out_file, *popenargs, **kwargs)
            output, unused_err = process.communicate()
            retcode = process.poll()

            if retcode:
                cmd = kwargs.get("args")
                if cmd is None:
                    cmd = popenargs[0]
                raise subprocess.CalledProcessError(retcode, cmd, output=output)
            return output

        # noinspection PyShadowingNames,PyShadowingNames
        class CalledProcessError(Exception):
            """Exception classes used by this module."""

            def __init__(self, return_code, cmd, output=None):
                self.return_code = return_code
                self.cmd = cmd
                self.output = output

            def __str__(self):
                return "Command '%s' returned non-zero exit status %d" \
                       % (self.cmd, self.return_code)

        subprocess.check_output = check_output
        subprocess.CalledProcessError = CalledProcessError
        try:
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