Beginning Python: From Novice to Professional (2nd Edition) by Magnus Lie Hetland
By Magnus Lie Hetland
Achieve a basic figuring out of Python's syntax and lines with the second one variation of starting Python, an up–to–date creation and useful reference. protecting a wide range of Python–related programming themes, together with addressing language internals, database integration, community programming, and internet prone, you'll be guided via sound improvement ideas. Ten accompanying tasks will make sure you can get your arms soiled in no time.
Updated to mirror the newest in Python programming paradigms and a number of other of the main the most important positive factors present in Python 3.0 (otherwise referred to as Python 3000), complex subject matters, equivalent to extending Python and packaging/distributing Python purposes, also are coated.
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As will become abundantly clear as you read on, more than one variable can refer to the same value. CHAPTER 1 ■ INSTANT HACKING: THE BASICS Enter. The resulting value of input is that very number, which is automatically printed out in the last line. That may not seem very useful, but look at the following: >>> x = input("x: ") x: 34 >>> y = input("y: ") y: 42 >>> print x * y 1428 Here, the statements at the Python prompts (>>>) could be part of a finished program, and the values entered (34 and 42) would be supplied by some user.
This may be useful if you want to check something “every 10 minutes” as in the recipe earlier in the chapter. You can simply check whether minute % 10 is 0. ) As you can see from the final example, the remainder operator works just fine with floats as well. The last operator is the exponentiation (or power) operator: >>> 2 ** 3 8 >>> -3 ** 2 -9 >>> (-3) ** 2 9 Note that the exponentiation operator binds tighter than the negation (unary minus), so -3**2 is in fact the same as -(3**2). If you want to calculate (-3)**2, you must say so explicitly.
The value 1j is an imaginary number. These numbers are written with a trailing j (or J), just like longs use L. Without delving into the theory of complex numbers, let me just show a final example of how you can use them: >>> (1+3j) * (9+4j) (-3+31j) As you can see, the support for complex numbers is built into the language. ■Note There is no separate type for imaginary numbers in Python. They are treated as complex numbers whose real component is zero. CHAPTER 1 ■ INSTANT HACKING: THE BASICS Back to the __future__ It has been rumored that Guido van Rossum (Python’s creator) has a time machine, because quite often when people request features in the language, the features have already been implemented.