Download Python Programming: An Introduction to Computer Science (2nd by John Zelle PDF

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By John Zelle

Notice: It's the initial 2d variation, contents are the same.

This is the second one version of John Zelle's Python Programming, up-to-date for Python three. This ebook is designed for use because the basic textbook in a college-level first path in computing. It takes a pretty conventional strategy, emphasizing challenge fixing, layout, and programming because the middle abilities of computing device technology. even though, those rules are illustrated utilizing a non-traditional language, particularly Python. even supposing Python is used because the language, educating Python isn't the major element of this ebook. fairly, Python is used to demonstrate primary ideas of layout and programming that observe in any language or computing setting. In a few locations, i've got purposely shunned sure Python good points and idioms that aren't often present in different languages. There are already many stable books approximately Python out there; this ebook is meant as an advent to computing. beneficial properties comprise the next: *Extensive use of special effects. *Interesting examples. *Readable prose. *Flexible spiral assurance. *Just-in-time item insurance. *Extensive end-of-chapter difficulties.

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Extra resources for Python Programming: An Introduction to Computer Science (2nd Edition)

Example text

We can trace the execution of these statements step-by-step to see why. Suppose x and y start with the values 2 and 4. Let’s examine the logic of the program to see how the variables change. The following sequence uses comments to describe what happens to the variables as these two statements are executed: # # x # y # variables initial values = y now = x final x 2 y 4 4 4 4 4 See how the first statement clobbers the original value of x by assigning to it the value of y? When we then assign x to y in the second step, we just end up with two copies of the original y value.

The expression, 10 / 3 produces 3 because three gozinta (goes into) ten three times (with a remainder of one). While the result of integer division is always an integer, the data type of the result depends on the data type of the operands. A float integer-divided by a float produces a float with a 0 fractional component. The last two interactions demonstrate the remainder operation %. The remainder of integer-dividing 10 by 3 is 1. Notice again that the data type of the result depends on the type of the operands.

5 Assignment Statements One of the most important kinds of statements in Python is the assignment statement. We’ve already seen a number of these in our previous examples. 5. Assignment Statements 29 Here variable is an identifier and expr is an expression. The semantics of the assignment is that the expression on the right side is evaluated to produce a value, which is then associated with the variable named on the left side. 9 * x * (1 - x) fahrenheit = 9 / 5 * celsius + 32 x = 5 A variable can be assigned many times.

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