sys.ps1

ps1

sys.ps1 and sys.ps2 are strings specifying the primary and secondary prompt of the interpreter. These are only defined if the interpreter is in interactive mode. Their initial values in this case are '>>> ' and '... '. If a non-string object is assigned to either variable, its str is re-evaluated each time the interpreter prepares to read a new interactive command; this can be used to implement a dynamic prompt.