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The is*() methods work on the basis of Unicode character classi cations, so for example, calling strisdigit() on the strings "\N{circled digit two}03" and " 03" returns True for both of them For this reason we cannot assume that a string can be converted to an integer when isdigit() returns True When we receive strings from external sources (other programs, les, network connections, and especially interactive users), the strings may have unwanted leading and trailing whitespace We can strip whitespace from the left using strlstrip(), from the right using strrstrip(), or from both ends using strstrip() We can also give a string as an argument to the strip methods, in which case every occurrence of every character given will be stripped from the appropriate end or ends For example:

[ Team LiB ]

>>> s = "\t no parking " >>> slstrip(), srstrip(), sstrip() ('no parking ', '\t no parking', 'no parking') >>> "<[unbracketed]>"strip("[](){}<>") 'unbracketed'

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We can also replace strings within strings using the strreplace() method This method takes two string arguments, and returns a copy of the string it is called on with every occurrence of the rst string replaced with the second If the second argument is an empty string the effect is to delete every occurrence of the rst string We will see examples of strreplace() and some other string methods in the csv2htmlpy example in the Examples section toward the end of the chapter One frequent requirement is to split a string into a list of strings For example, we might have a text le of data with one record per line and each record s elds separated by asterisks This can be done using the strsplit() method and passing in the string to split on as its rst argument, and optionally the maximum number of splits to make as the second argument If we don t specify the second argument, as many splits are made as possible Here is an example:

The service de ned in Listing 213 uses WCF attributes to override the default names generated by WCF

>>> record = "Leo Tolstoy*1828-8-28*1910-11-20" >>> fields = recordsplit("*") >>> fields ['Leo Tolstoy', '1828-8-28', '1910-11-20']

[ Team LiB ]

97

Now we can use strsplit() again on the date of birth and date of death to calculate how long he lived (give or take a year):

The utility with the switch can be used to generate WSDL from a service Alternatively, if the service exposes a MEX endpoint over an http binding, the WSDL can be viewed by accessing the base address from Internet Explorer The format of the WSDL will vary or Internet Explorer to view it, but slightly whether you use the differences are insigni cant and just relating to packaging In either case, Listing 214 shows the WSDL associated with the code listed in Listing , and names are con213 The name is trolled by the code Note that the and not , as the class is named in Listing 213

>>> born = fields[1]split("-") >>> born ['1828', '8', '28'] >>> died = fields[2]split("-") >>> print("lived about", int(died[0]) - int(born[0]), "years") lived about 82 years

143 Sample Code (RMSMIDletjava)

We had to use int() to convert the years from strings to integers, but other than that the snippet is straightforward We could have gotten the years directly from the fields list, for example, year_born = int(fields[1]split("-")[0]) The two methods that we did not summarize in Tables 28, 29, and 210 are strmaketrans() and strtranslate() The strmaketrans() method is used to create a translation table which maps characters to characters It accepts one, two, or three arguments, but we will show only the simplest (two argument) call where the rst argument is a string containing characters to translate from and the second argument is a string containing the characters to translate to

Both arguments must be the same length The strtranslate() method takes a translation table as an argument and returns a copy of its string with the characters translated according to the translation table Here is how we could translate strings that might contain Bengali digits to English digits:

Inside a service, functional application capabilities are implemented in code Outside a service, functional capabilities are de ned in WSDL Inside a WCF service, application data is represented in simple and complex types while outside the service data is represented by XML Schema De nitions (XSD) WCF data contracts provide a mapping function between NET CLR types that are de ned in code and XML Schemas De nitions de ned by the W3C organization (wwww3corg/) that are used for communication outside the service

table = ""maketrans("\N{bengali digit zero}" "\N{bengali digit one}\N{bengali digit two}" "\N{bengali digit three}\N{bengali digit four}" "\N{bengali digit five}\N{bengali digit six}" "\N{bengali digit seven}\N{bengali digit eight}" "\N{bengali digit nine}", "0123456789") print("20749"translate(table)) # prints: 20749 print("\N{bengali digit two}07\N{bengali digit four}" "\N{bengali digit nine}"translate(table)) # prints: 20749

The following small sample application, RMSMIDletjava, demonstrates some of the capabilities of RMS Only the main class and one non-public implementation class of this application are shown

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