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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def s3_cache_readonly(self):
 """ Whether the Amazon S3 bucket is considered read only. If this is :data:`True` then the Amazon S3 bucket will only be used for :class:`~pip_accel.caches.s3.S3CacheBackend.get()` operations (all :class:`~pip_accel.caches.s3.S3CacheBackend.put()` operations will be disabled). - Environment variable: ``$PIP_ACCEL_S3_READONLY`` (refer to :func:`~humanfriendly.coerce_boolean()` for details on how the value of the environment variable is interpreted) - Configuration option: ``s3-readonly`` (also parsed using :func:`~humanfriendly.coerce_boolean()`) - Default: :data:`False` For details please refer to the :mod:`pip_accel.caches.s3` module. """

        return coerce_boolean(self.get(property_name='s3_cache_readonly',
                                       environment_variable='PIP_ACCEL_S3_READONLY',
                                       configuration_option='s3-readonly',
                                       default=False))