By Kurt W. Smith
Build software program that mixes Python's expressivity with the functionality and keep an eye on of C (and C++). It's attainable with Cython, the compiler and hybrid programming language utilized by foundational programs equivalent to NumPy, and well-known in tasks together with Pandas, h5py, and scikits-learn. during this functional advisor, you'll how to use Cython to enhance Python's performance—up to 3000x— and to wrap C and C++ libraries in Python with ease.
Author Kurt Smith takes you thru Cython's functions, with pattern code and in-depth perform workouts. If you're simply beginning with Cython, or are looking to cross deeper, you'll learn the way this language is an important a part of any performance-oriented Python programmer's arsenal.
• Use Cython's static typing to hurry up Python code
• achieve hands-on adventure utilizing Cython positive aspects to spice up your numeric-heavy Python
• Create new varieties with Cython—and see how briskly object-oriented programming in Python can be
• successfully manage Cython code into separate modules and applications with out sacrificing performance
• Use Cython to provide Pythonic interfaces to C and C++ libraries
• Optimize code with Cython's runtime and compile-time profiling tools
• Use Cython's prange functionality to parallelize loops transparently with OpenMP
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Try to find an input that forces the loop to execute only once. Find an input that forces the program to execute more than once. indd 35 1/6/09 12:09:49 PM 36 Part 1 Basic Features of Python ⦁ If an upper bound has been set on the number of iterations of the loop, try to find values that barely meet the upper bound, meet the upper bound, and exceed the upper bound. py", line 8, in ? print 'average is', sum / count ZeroDivisionError: float division Break, Continue, and Pass Statements*1 It is not uncommon to want to end a loop in the middle of execution.
Assume the variable named n holds a positive integer value. How do you determine the last digit of n? ) 15. You have probably discovered that the % operator performs the remainder operation when used with two positive integer arguments. But what does it do when one or both arguments are negative? >>> 2 >>> -1 >>> 1 >>> -2 11 % 3 11 % -3 -11 % 3 -11 % -3 Try to come up with an explanation of this behavior. To do so, make a chart of the values from –15 to 15, and for each compute the result when used with the mod operator and the value 3.
The first line contains one star, the second two stars, and so on until the last line, which should have n stars. Can you write this using only a single loop? Hint: Remember what the expression '+'*5 does. Enter a size: 5 + ++ +++ ++++ +++++ 19. Write a program that reads two integer values n and m from the user and then produces a box that is n wide and m deep, such as the following: Enter a width: 5 Enter a height: 4 @@@@@ @ @ @ @ @@@@@ 20. What does the range loop do if it is given negative numbers?