Computer. Fraud & Security (April 2005)

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Else: ... num = 2 ... >>>num 2 >>> num = (3>5 and 1) or 2 >>> num 2 The following two expressions are also equivalent: >>> if ( 5 > 3): ... num = 1 ... else: ... num = 2 ... >>>num 1 >>> num = (5>3 and 1) or 2 >>> num 1 Be warned: This simulation works only if the expressions true_return and false_return are not equivalent to false. If we need them to be false, we can do something like this: >>> true_return = 0 >>> false_return = 2 >>> num = (5 > 3 and [true_return]) \ or [false_return] >>> num [0] Now the num variable is equivalent to a list containing one element, but this isn't exactly what we want.

Obviously, Python is more flexible and dynamic than Java, but not as type safe. If you come from a Smalltalk background, this is probably a boon, but probably not if you come from C++. Read Appendix C on the advantages of scripting languages, and then decide for yourself. Valid Variable Names Variable names in Python can start with a letter or an underscore (_). After the first character, they can also contain numbers, and they can be as long as you want them to be. Keep in mind that variable names are case sensitive.

Logical Operators OperatorDescriptionInteractive SessionandAnd two values or comparisons together >>> >>> 0 >>> >>> 1 x,y = 1,0 x and y x,y = 1,1 x and y orOr two values together >>> x,y = 1,0 >>> x or y 1 >>> x,y = 0,0 49 50 >>> x or y 0 notInverse a value >>> >>> 1 >>> 1 >>> >>> 0 x,y = 0,0 not x not y x = 1 not x Table 3-3. =z 1 <>Not equal to 50 51 >>> x<>y 0 >>> x<>z 1 isObject identity >>> str = str2 = "hello" >>> str is str2 1 >>> str = "hi" >>> str is str2 0 is notNegated object identity >>> s1 = s2 = "hello" >>> s1 is not s2 0 >>> s1 = s2 + " Bob" >>> s1 is not s2 1 inChecks to see if an item is in a sequence >>> list = [1,2,3] >>> 1 in list 1 >>> 4 in list 0 not inChecks to see if an item is NOT in a sequence >>> list = [1,2,3] >>> 1 not in list 0 >>> 4 not in list 1 Advanced Topic: Logical Operators and Boolean Returns Comparison operators always return either 1 or 0 of type Integer.

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