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It is possible to share your data contracts without generating proxy classes using svcutilexe or Add Service Reference This is done by adding a reference to the assembly that contains your data contracts In this situation, make sure that the data contracts implement or else they will not support roundtrip serialization

If this line is put at the beginning of a program, after the imports but before any use is made of sysstdout, any text that is sent to sysstdout will actually be sent to the ioStringIO le-like object which this line has created and which has replaced the standard sysstdout le object Now, when the print() and sysstdoutwrite() lines shown earlier are executed, their output will go to the ioStringIO object instead of the console (At any time we can restore the original sysstdout with the statement sysstdout = sys__stdout__) We can obtain all the strings that have been written to the ioStringIO object by calling the ioStringIOgetvalue() function, in this case by calling sysstdoutgetvalue() the return value is a string containing all the lines that have been written This string could be printed, or saved to a log or sent over a network connection like any other string We will see another example of ioStringIO use a bit further on ( 227)

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If we need a program to be able to process text that may have been redirected in the console or that may be in les listed on the command line, we can use the fileinput module s fileinputinput() function This function iterates over all the lines redirected from the console (if any) and over all the lines in the les listed on the command line, as one continuous sequence of lines The module can report the current lename and line number at any time using fileinputfilename() and fileinputlineno(), and can handle some kinds of compressed les Two separate modules are provided for handling command-line options,

Back in 2 we described the csv2htmlpy program In that chapter s exercises we proposed extending the program to accept the command-line arguments, maxwidth taking an integer and format taking a string The model solution (csv2html2_anspy) has a 26-line function to process the arguments Here is the start of the main() function for csv2html2_optpy, a version of the program that uses the optparse module to handle the command-line arguments rather than a custom function:

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Listing 622 shows a newer version of the contract that con, which represents the employee s social secutains an additional eld, rity number

def main(): parser = optparseOptionParser() parseradd_option("-w", "--maxwidth", dest="maxwidth", type="int", help=("the maximum number of characters that can be " "output to string fields [default: %default]")) parseradd_option("-f", "--format", dest="format", help=("the format used for outputting numbers " "[default: %default]")) parserset_defaults(maxwidth=100, format="0f") opts, args = parserparse_args()

Only nine lines of code are needed, plus the import optparse statement Furthermore, we do not need to explicitly provide -h and --help options; these are handled by the optparse module to produce a suitable usage message using the texts from the help keyword arguments, and with any %default text replaced with the option s default value Notice also that the options now use the conventional Unix style of having both short and long option names that start with a hyphen Short names are convenient for interactive use at the console; long names are more understandable when used in shell scripts For example, to set the maximum width to 80 we can use any of -w80, -w 80, --maxwidth=80, or --maxwidth 80 After the command line is parsed, the options are available using the dest names, for example, optsmaxwidth and optsformat Any command-line arguments that have not been processed (usually lenames) are in the args list If an error occurs when parsing the command line, the optparse parser will call sysexit(2) This leads to a clean program termination and returns 2 to the operating system as the program s result value Conventionally, a return value of 2 signi es a usage error, 1 signi es any other kind of error, and 0 means success When sysexit() is called with no arguments it returns 0 to the operating system

The private _bike_from_record() and _record_from_bike() functions isolate the binary representation of the BikeStockBike class from the BikeStockBikeStock class that holds a collection of bikes The logical structure of a bike record le is shown in Figure 76 The physical structure is slightly different because each record is preceded by a state byte

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