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For functions or methods that don t return anything (they actually return None), we normally give them a suite consisting of pass, and for those whose return value is used we either return a constant (say, 0) or one of the arguments, unchanged which is what we have done here (In more complex situations it may be more useful to return fake objects third-party modules that provide mock objects are available for such cases) When the doctest is run it will fail, listing each of the strings ('ABCD-EF', 'ABCDE-F', etc) that it expected, and the strings it actually got (all of which are 'ABCDEF') Once we are satis ed that the doctest is suf cient and correct, we can write the body of the function, which in this case is simply return string[:position] + insert + string[position:] (And if we wrote return string[:position] + insert, and then copied and pasted string[:position] at the end to save ourselves some typing, the doctest will immediately reveal the error) Python s standard library provides two unit testing modules, doctest, which we have already brie y seen here and earlier (in 5; 202 , and 6; 247 ), and unittest In addition, there are third-party testing tools for

The program in Fig 535 can safely execute with multiple threads, but it will not run any faster as more threads are added In fact, this program will slow down as more threads are added because the threads will waste system resources as they wait for their turn to execute the critical section In essence, the concurrency control protocol eliminates all of the available concurrency The solution to this problem is to take advantage of the fact that the swap operations on the shared data only interfere when at least one of the locations being swapped is the same in both operations Hence, the right concurrency control protocol uses pairwise synchronization with nested locks, thereby adding only modest overhead when loop iterations do not interfere The approach used in

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Python Two of the most notable are nose (codegooglecom/p/python-nose), which aims to be more comprehensive and useful than the standard unittest module, while still being compatible with it, and pytest (codespeak net/py/dist/test/testhtml) this takes a somewhat different approach to unittest, and tries as much as possible to eliminate boilerplate test code Both of these third-party tools support test discovery, so there is no need to write an overarching test program since they will search for tests themselves This makes it easy to test an entire tree of code or just a part of the tree (eg, just those modules that have been worked on) For those serious about testing it is worth investigating both of these third-party modules (and any others that appeal), before deciding which testing tools to use Creating doctests is straightforward: We write the tests in the module, function, class, and methods docstrings, and for modules, we simply add three lines at the end of the module:

if __name__ == "__main__": import doctest doctesttestmod()

[ADE 01 + ] is to create an OpenMP lock for each chromosome Pseudocode for this solution is shown in Fig 536 In the resulting program, most of the loop iterations do not actually interfere with each other The total number of chromosomes, NPOP (40,000 in the SPEC OMP2001 benchmark), is much larger than the number of UEs, so there is only a slight chance that loop iterations will happen to interfere with another loop iteration OpenMP locks are described in the OpenMP appendix, Appendix A The locks themselves use an opaque type, omp_lock_t, defined in the omph header file The lock array is defined and later initialized in a separate parallel loop Once inside the chromosome swapping loop, the locks are set for the pair of swapping chromosomes, the swap is carried out, and the locks are unset Nested locks are being used, so the possibility of deadlock must be considered The solution here is to order the locks using the value of the indices of the array element associated with the lock Always acquiring locks in this order will prevent deadlock when a pair of loop iterations happen to be swapping the same two elements at the same time After the more efficient concurrency control protocol is implemented, the program runs well in parallel

If we want to use doctests inside programs, that is also possible For example, the blockspy program whose modules are covered later (in 14) has doctests for its functions, but it ends with this code:

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