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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 connect(self, creds):
 """Return a boto S3Connection set up with great care. This includes TLS settings, calling format selection, and region detection. The credentials are applied by the caller because in many cases (instance-profile IAM) it is possible for those credentials to fluctuate rapidly. By comparison, region fluctuations of a bucket name are not nearly so likely versus the gains of not looking up a bucket's region over and over. """

        def _conn_help(*args, **kwargs):
            return _connect_secureish(
                *args,
                provider=creds,
                calling_format=self.calling_format(),
                auth_region_name=self.region,
                **kwargs)

        # If WALE_S3_ENDPOINT is set, do not attempt to guess
        # the right calling conventions and instead honor the explicit
        # settings within WALE_S3_ENDPOINT.
        impl = os.getenv('WALE_S3_ENDPOINT')
        if impl:
            return connection.S3Connection(**_s3connection_opts_from_uri(impl))

        # Check if subdomain format compatible: if so, use the
        # BUCKETNAME.s3.amazonaws.com hostname to communicate with the
        # bucket.
        if self.calling_format is connection.SubdomainCallingFormat:
            return _conn_help(host='s3.amazonaws.com')

        # Check if OrdinaryCallingFormat compatible, but also see if
        # the endpoint has already been set, in which case only
        # setting the host= flag is necessary.
        assert self.calling_format is connection.OrdinaryCallingFormat
        assert self.ordinary_endpoint is not None
        return _conn_help(host=self.ordinary_endpoint)