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for each The response is the requested data or con rmation of the requested action, or an indication of an error
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The client program is car_registrationpy Here is an example of interaction (with the server already running, and with the menu edited slightly to t on the page):
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(C)ar (M)ileage (O)wner (N)ew car License: 024 hyr License: 024 HYR Seats: 2 Mileage: 97543 Owner: Jack Lemon (C)ar (M)ileage (O)wner (N)ew car License [024 HYR]: Mileage [97543]: 103491 Mileage successfully changed (S)top server (Q)uit [c]:
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(Q)uit [c]: m
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The data entered by the user is shown in bold where there is no visible input it means that the user pressed Enter to accept the default Here the user has asked to see the details of a particular car and then updated its mileage As many clients as we like can be running, and when a user quits their particular client the server is unaffected But if the server is stopped, the client it was stopped in will quit and all the other clients will get a Connection refused error and will terminate when they next attempt to access the server In a more sophisticated application, the ability to stop the server would be available only to certain users, perhaps on only particular machines, but we have included it in the client to show how it is done We will now review the code, starting with the main() function and the handling of the user interface, and nishing with the networking code itself
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def main(): if len(sysargv) > 1: Address[0] = sysargv[1] call = dict(c=get_car_details, m=change_mileage, o=change_owner, n=new_registration, s=stop_server, q=quit) menu = ("(C)ar Edit (M)ileage Edit (O)wner (N)ew car " "(S)top server (Q)uit") valid = frozenset("cmonsq") previous_license = None while True: action = Consoleget_menu_choice(menu, valid, "c", True) previous_license = call[action](previous_license)
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Branching using dictionaries 340
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The Address list is a global that holds the IP address and port number as a two-item list, ["localhost", 9653], with the IP address overridden if speci ed on the command line The call dictionary maps menu options to functions The Console module is one supplied with this book and contains some useful functions for getting values from the user at the console, such as Consoleget_string() and Consoleget_integer(); these are similar to functions
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developed in earlier chapters and have been put in a module to make them easy to reuse in different programs As a convenience for users, we keep track of the last license they entered so that it can be used as the default, since most commands start by asking for the license of the relevant car Once the user makes a choice we call the corresponding function passing in the previous license, and expecting each function to return the license it used Since the loop is in nite the program must be terminated by one of the functions; we will see this further on
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def get_car_details(previous_license): license, car = retrieve_car_details(previous_license) if car is not None: print("License: {0}\nSeats: {seats}\nMileage: {mileage}\n" "Owner: {owner}"format(license, **car_asdict())) return license
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This function is used to get information about a particular car Since most of the functions need to request a license from the user and often need some car-related data to work on, we have factored out this functionality into the retrieve_car_details() function it returns a 2-tuple of the license entered by the user and a named tuple, CarTuple, that holds the car s seats, mileage, and owner (or the previous license and None if they entered an unrecognized license) Here we just print the information retrieved and return the license to be used as the default for the next function that is called and that needs the license
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def retrieve_car_details(previous_license): license = Consoleget_string("License", "license", previous_license) if not license: return previous_license, None license = licenseupper() ok, *data = handle_request("GET_CAR_DETAILS", license) if not ok: print(data[0]) return previous_license, None return license, CarTuple(*data)
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This is the rst function to make use of networking It calls the handle_request() function that we review further on The handle_request() function takes whatever data it is given as arguments and sends it to the server, and then returns whatever the server replies The handle_request() function does not know or care what data it sends or returns; it purely provides the networking service
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