pt-spec says that the options should be space-separated: ``` 2.1.0.1. Bridge torrc lines Bridge lines specify how Tor should connect to a bridge. The Bridge line format is: Bridge [<transport>] <address>:<port> [<id-fingerprint>] [<k>=<v>] [<k>=<v>] [<k>=<v>] The PT-specific parts of this format are the [transport] and [k=v] values. <transport> is the name of the PT that MUST be used when connecting to the bridge, and the <k>=<v> values are PT-specific parameters that MUST be passed to the PT when connecting to the bridge (this MAY include keys, passwords or other PT configuration options) as specified in [CLIENTPARAMS]. ``` we comma-separate them: ``` args = ",".join(["%s=%s" % (k, v) for k, v in self.argdict.items()]) ```