An Introduction to Python

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1、AnIntroductiontoPythonJohnC.LusthJuly10,20112Contents1StartingOut91.1RunningPython...........................................92Literals112.1Integers................................................112.2RealNumbers.............................................122.3Strings

2、.................................................122.4True,False,andNone........................................132.5Lists..................................................132.6IndexingintoLists..........................................143CombiningLiterals173.1Numerico

3、perators..........................................173.2Comparingthings...........................................193.3Combiningcomparisons.......................................204PrecedenceandAssociativity214.1Precedence..............................................21

4、4.2Associativity.............................................215Variables235.1Variables...............................................235.2Variablenaming...........................................256Assignment276.1PrecedenceandAssociativityofAssignment.................

5、...........2834CONTENTS6.2AssignmentPatterns.........................................296.2.1TheTransferPattern....................................296.2.2TheUpdatePattern.....................................306.2.3TheThrow-awayPattern..................................31

6、6.2.4TheThrow-awayPatternandFunctions..........................316.3AboutPatterns............................................326.4AssignmentandLists........................................327Conditionals337.1Logicalexpressions..........................................3

7、37.2Logicaloperators...........................................337.3Shortcircuiting............................................347.4Ifexpressions.............................................347.5if-elif-elsechains...........................................348Functions3

8、78.1Encapsulatingaseriesofoperations................................378.2Passingarguments............................