By Yue Zhang (auth.)
This ebook introduces Python programming language and primary innovations in algorithms and computing. Its audience contains scholars and engineers with very little historical past in programming, who have to grasp a realistic programming language and examine the fundamental pondering in machine science/programming. the most contents come from lecture notes for engineering scholars from all disciplines, and has got excessive rankings. Its fabrics and ordering were adjusted many times based on school room reception. in comparison to replacement textbooks available in the market, this ebook introduces the underlying Python implementation of quantity, string, checklist, tuple, dict, functionality, category, example and module gadgets in a constant and easy-to-understand approach, making project, functionality definition, functionality name, mutability and binding environments comprehensible inside-out. by means of giving the abstraction of implementation mechanisms, this publication builds an exceptional figuring out of the Python programming language.
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Additional resources for An Introduction to Python and Computer Programming
The getitem operator does not apply to numbers, such as integers and floating point numbers, but applies to other sequential objects, which will be introduced later in Chaps. 5 and 6. It takes the form of a pair of squared brackets, written immediately after the string operand and enclosing the integer operand, which specifies for the character index. >>> >>> ’a ’ >>> ’b ’ >>> ’c ’ >>> >>> ’a ’ s = ’ abc ’ s  # the first c h a r a c t e r s  # the s e c o n d c h a r a c t e r s  x =0 s [ x ] # index can be any i n t e g e r e x p r e s s i o n Note that string indices start from 0 rather than 1.
Devices are the channel through which computers are connected 22 2 Using Python as a Calculator to the physical world. Keyboards, mouses, displays, speakers, microphones are a few commonly-used devices. An important device is the hard disk, on which the OS defines a file system for external storage of information. 1 Information Computers are information-processing machines. The rounding-off error examples show that the basic unit of storage and computation can only accommodate a limited amount of information.
To find the representation of –13, two steps are necessary. First, the absolute value, 13, or 00001101 in binary form, is inversed bit by bit into 11110010. Then 1 is added to the back of the number: 11110010 +) 0 0 0 0 0 0 0 1 ----------11110011 The resulting number, 1110011, is the binary representation of –13 in 2’s complement form. Note that the first bit is 1, indicating that it is a negative number. For 24 2 Using Python as a Calculator another example, to represent –16, its absolute value 00010000 is first inversed bit by bit into 11101111, and then 1 is added to the number, 11101111 +) 0 0 0 0 0 0 0 1 ----------11110000 As a result, –13 and –16 are 11110011 and 11110000, respectively, according to 2’s complement representation.
An Introduction to Python and Computer Programming by Yue Zhang (auth.)