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The _grid is created using a list comprehension inside a list comprehension Using list replication such as [[char] * columns] * rows will not work because the inner list will be shared (shallow-copied) We could have used nested for in loops instead:

_grid = [] for row in range(_max_rows): _gridappend([]) for column in range(_max_columns): _grid[-1]append(_background_char)

Implementing Transactions (Operation Behavior)

void addCommand(Command cmd) Alert(String title) Alert(String title, String alertText, Image alertImage, AlertType alertType) MIDP 20 Command int int Image Gauge String int AlertType void void void void void void void DISMISS_COMMAND FOREVER getDefaultTimeout() getImage() getIndicator() getString() getTimeout() getType() removeCommand(Command cmd) setCommandListener(CommandListener l) setImage(Image img) setIndicator(Gauge indicator) setString(String str) setTimeout(int time) setType(AlertType type)

We will review just one of the drawing functions to give a avor of how the drawing is done, since our primary concern is with the implementation of the module Here is the add_horizontal_line() function, split into two parts:

def add_horizontal_line(row, column0, column1, char="-"): """Adds a horizontal line to the grid using the given char >>> add_horizontal_line(8, 20, 25, "=") >>> char_at(8, 20) == char_at(8, 24) == "=" True >>> add_horizontal_line(31, 11, 12) Traceback (most recent call last): RowRangeError """

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The docstring has two tests, one that is expected to work and another that is expected to raise an exception When dealing with exceptions in doctests the pattern is to specify the Traceback line, since that is always the same and tells the doctest module an exception is expected, then to use an ellipsis to stand for the intervening lines (which vary), and ending with the exception line we expect to get The char_at() function is one of those provided by the module; it returns the character at the given row and column position in the grid

Method executes without a transaction Method creates and executes within a new transaction A SOAP fault is returned for the transaction header Method executes without a transaction Method executes under the owed transaction

[ Team LiB ]

assert len(char) == 1, _CHAR_ASSERT_TEMPLATEformat(char) try: for column in range(column0, column1): _grid[row][column] = char except IndexError: if not 0 <= row <= _max_rows: raise RowRangeError() raise ColumnRangeError()

The code begins with the same character length check that is used in the resize() function Rather than explicitly checking the row and column arguments, the function works by assuming that the arguments are valid If an IndexError exception occurs because a nonexistent row or column is accessed, we catch the exception and raise the appropriate module-speci c exception in its place This style of programming is known colloquially as it s easier to ask forgiveness than permission , and is generally considered more Pythonic (good Python programming style) than look before you leap , where checks are made in advance Relying on exceptions to be raised rather than checking in advance is more ef cient when exceptions are rare (Assertions don t count as look before you leap because they should never occur and are often commented out in deployed code)

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Listing 518 demonstrates use of these elements The code is similar to that shown in Listing 515, but while that code ensures transactional ), this code shows transactional integrity of one service operation ( attribute Note integrity across services with the is marked as requiring sessions To a few points First, the or meet this requirement, a sessionful protocol, such as , must be used Second, for illustrative purposes, the is set to false and the last line of the method is If execution doesn t reach , the transaction will be automatically rolled back Third, the is speci ed on each to allow the transaction to span service calls

[ Team LiB ]

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For more about the bytes data type, see the sidebar The Bytes and Bytearray Data Types (293 ), and Tables 71, 72, and 73 ( 299 301), which list their methods Here is the code for reading an incidents pickle le:

Protocol 3 is Python 3-speci c If we want pickles that are readable and writable by both Python 2 and Python 3 programs, we must use protocol 2 instead Note, though, that protocol 2 les written by Python 31 can be read by Python 31 and Python 2x, but not by Python 30!

Implementing Transactions (Operation Behavior)

def import_pickle(self, filename): fh = None try: fh = open(filename, "rb") magic = fhread(len(GZIP_MAGIC)) if magic == GZIP_MAGIC: fhclose() fh = gzipopen(filename, "rb") else: fhseek(0) selfclear() selfupdate(pickleload(fh)) return True except (EnvironmentError, pickleUnpicklingError) as err: print("{0}: import error: {1}"format( ospathbasename(sysargv[0]), err)) return False finally: if fh is not None: fhclose()

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