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or one of our own modules listed The problem will almost certainly be on the line Python speci es, or on an earlier line This particular example illustrates that we should modify the blockspy program to cope gracefully when given the names of nonexistent les This is a usability error, and it should also be classi ed as a logical error, since terminating and printing a traceback cannot be considered to be acceptable program behavior In fact, as a matter of good policy and courtesy to our users, we should always catch all relevant exceptions, identifying the speci c ones that we consider to be possible, such as EnvironmentError In general, we should not use the catchalls of except: or except Exception:, although using the latter at the top level of our program to avoid crashes might be appropriate but only if we always report any exceptions it catches so that they don t go silently unnoticed Exceptions that we catch and cannot recover from should be reported in the form of error messages, rather than exposing our users to tracebacks which look scary to the uninitiated For GUI programs the same applies, except that normally we would use a message box to notify the user of a problem And for server programs that normally run unattended, we should write the error message to the server s log Python s exception hierarchy was designed so that catching Exception doesn t quite cover all the exceptions In particular, it does not catch the KeyboardInterrupt exception, so for console applications if the user presses Ctrl+C, the program will terminate If we choose to catch this exception, there is a risk that we could lock the user into a program that they cannot terminate This arises because a bug in our exception handling code might prevent the program from terminating or the exception propagating (Of course, even an uninterruptible program can have its process killed, but not all users know how) So if we do catch the KeyboardInterrupt exception we must be extremely careful to do the minimum amount of saving and clean up that is necessary and then terminate the program And for programs that don t need to save or clean up, it is best not to catch KeyboardInterrupt at all, and just let the program terminate One of Python 3 s great virtues is that it makes a clear distinction between raw bytes and strings However, this can sometimes lead to unexpected exceptions occurring when we pass a bytes object where a str is expected or vice versa For example:.

Traceback (most recent call last): File "programpy", line 918, in <module> print(datetimedatetimestrptime(date, format)) TypeError: strptime() argument 1 must be str, not bytes

When we hit a problem like this we can either perform the conversion in this case, by passing datedecode("utf8") or carefully work back to nd out where

Figure 533 Example of nested locking using synchronized blocks with dummy objects lockA and lockB class Y { Object lockA = new Object(); Object lockB = new Object(); void A() { synchronized(lockA) { compute synchronized(lockB) { read and update y } } } void B() throws InterruptedException { synchronized(lockB) { compute } }

Next, we look at the entities in the Inventory submodel This model is similar to the Products submodel in that we don t have a lot of work to do The entities we will work with are listed here and shown in Figure 95

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and why the variable is a bytes object rather than a str, and x the problem at its source When we pass a string where bytes are expected the error message is somewhat less obvious, and differs between Python 30 and 31 For example, in Python 30:

Traceback (most recent call last): File "programpy", line 2139, in <module> datawrite(info) TypeError: expected an object with a buffer interface

Review other considerations Memory synchronization Make sure memory is synchronized as required: Caching and compiler optimizations can result in unexpected behavior with respect to shared variables For example, a stale value of a variable might be read from a cache or register instead of the newest value written by another task, or the latest value might not have been flushed to memory and thus would not be visible to other tasks In most cases, memory synchronization is performed implicitly by higher level synchronization primitives, but it is still necessary to be aware of the issue Unfortunately, memory synchronization techniques are very platform specific In OpenMP, the flush directive can be used to synchronize memory explicitly; it is implicitly invoked by several other directives In Java, memory is

3x 30

In Python 31 the error message s text has been slightly improved:

Again, these entities make nice individual tables so we don t have much to do Notice that Vendors and Products both appear again in this submodel We won t need to make any further updates to these tables, and if you are using a good modeling tool, the change you have already made will be reflected in the new physical Inventory submodel In Figure 96 you can see the physical model for the Inventory submodel

Traceback (most recent call last): File "programpy", line 2139, in <module> datawrite(info) TypeError: 'str' does not have the buffer interface

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