def __init__()

in fxa/core.py [0:0]


    def __init__(self, server_url=None, key_stretch_version=1):
        if server_url is None:
            server_url = DEFAULT_SERVER_URL
        if not isinstance(server_url, str):
            self.apiclient = server_url
            self.server_url = self.apiclient.server_url
        else:
            server_url = server_url.rstrip("/")
            if not server_url.endswith(VERSION_SUFFIXES):
                server_url += VERSION_SUFFIXES[0]
            self.server_url = server_url
            self.apiclient = APIClient(server_url)

        if key_stretch_version not in [1, 2]:
            raise ValueError("Invalid key_stretch_version! Options are: 1,2")
        else:
            self.key_stretch_version = key_stretch_version