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If compression has been requested, we use the gzip module s gzipopen() function to open the le; otherwise, we use the built-in open() function We must use write binary mode ("wb") when pickling data in binary format In Python 30 and 31, pickleHIGHEST_PROTOCOL is protocol 3, a compact binary pickle format This is the best protocol to use for data shared among Python 3 programs For error handling we have chosen to report errors to the user as soon as they occur, and to return a Boolean to the caller indicating success or failure And we have used a finally block to ensure that the le is closed at the end, whether there was an error or not In 8 we will use a more compact idiom to ensure that les are closed that avoids the need for a finally block This code is very similar to what we saw in the preceding chapter, but there is one subtle point to note The pickled data is self, a dict But the dictionary s values are Incident objects, that is, objects of a custom class The pickle module is smart enough to be able to save objects of most custom classes without us needing to intervene In general, Booleans, numbers, and strings can be pickled, as can instances of classes including custom classes, providing their private __dict__ is picklable In addition, any built-in collection types (tuples, lists, sets, dictionaries) can be pickled, providing they contain only picklable objects (including collection types, so recursive structures are supported) It is also possible to pickle other kinds of objects or instances of custom classes that can t normally be pickled (eg, because they have a nonpicklable attribute), either by giving some help to the pickle module or by implementing custom pickle and unpickle functions All the relevant details are provided in the pickle module s online documentation To read back the pickled data we need to distinguish between a compressed and an uncompressed pickle Any le that is compressed using gzip compression begins with a particular magic number A magic number is a sequence of one or more bytes at the beginning of a le that is used to indicate the le s type For gzip les the magic number is the two bytes 0x1F 0x8B, which we store in a bytes variable:.

GZIP_MAGIC = b"\x1F\x8B"

__dict__

[OperationContract] Deposit(Account, Amt) { commit; }

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clear_screen() function Since the function is not de ned inside another func-

tion (or inside a class as we will see in the next chapter), it is still a global function, accessible like any other function in the module After creating the function we explicitly set its docstring; this avoids us having to write the same docstring in two places, and also illustrates that a docstring is simply one of the attributes of a function Other attributes include the function s module and its name

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def resize(max_rows, max_columns, char=None): """Changes the size of the grid, wiping out the contents and changing the background if the background char is not None """ assert max_rows > 0 and max_columns > 0, "too small" global _grid, _max_rows, _max_columns, _background_char if char is not None: assert len(char) == 1, _CHAR_ASSERT_TEMPLATEformat(char) _background_char = char _max_rows = max_rows _max_columns = max_columns _grid = [[_background_char for column in range(_max_columns)] for row in range(_max_rows)]

The NET 35 documentation on the attribute includes the following table to describe the relationship between these elements It is repeated here for convenience

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This function uses an assert statement to enforce the policy that it is a coding error to attempt to resize the grid smaller than 1 1 If a background character is speci ed an assert is used to guarantee that it is a string of exactly one character; if it is not, the assertion error message is the _CHAR_ASSERT_TEMPLATE s text with the {0} replaced with the given char string Unfortunately, we must use the global statement because we need to update a number of global variables inside this function This is something that using an object-oriented approach can help us to avoid, as we will see in 6

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