Download Python Programming with the Java™ Class Libraries: A by Richard Hightower PDF

By Richard Hightower

ISBN-10: 0201616165

ISBN-13: 9780201616163

Characterised by way of ease of use, richness of expression, and concise syntax, Python has remained a best programming language for greater than a decade, and is utilized by rookies and pros alike. specifically, its shut dating to Java(TM) makes the 2 languages, whilst utilized in mix, perfect for net and disbursed firm program development.This instructional starts off with insurance of a few of the fundamentals of Python programming. utilizing lots of skill-building workouts and interactive programming periods, this e-book may help these new to programming enhance an figuring out of recommendations and functional innovations. for knowledgeable programmers, the booklet demonstrates Python's breadth of functions and indicates the ways in which Python interfaces with Java APIs for pro program development.Python Programming with the Java(TM) category Libraries: an educational for development net and company functions with Jython covers vital themes resembling: basic programming options, together with statements, expressions, interpreters, and compilers Python fundamentals, together with operators, string formatting, namespaces, sessions, blunders, and exceptions Object-oriented programming innovations dossier input/output Python's intrinsic services Formatting, parsing, and manipulating strings Interfacing with the Java APIs and dealing with Java Streams utilizing Python and Java Swing to create GUIs operating with SQL and JDBC(TM) Python and Java applets furthermore, the publication comprises directions for downloading and fitting the Python language and the Java improvement equipment (JDK). Terminology, definitions, causes, and various code samples make this publication an invaluable studying experience.Whether you're a subtle laptop person new to programming or a significant software developer, Python Programming with the Java(TM) type Libraries provides you with perception into the facility of Python and the knowledge to place it to paintings.

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We know this because in interactive interpreter mode an expression is printed out to the screen. >>> x = y = z = 3 >>> x = z >>> x==z 1 As you can see, x = z and x = y = z = 3 aren't printed to the screen, which means that they don't return a value and so are not expressions. In Python, the use of the comparison operator (==), not the assignment operator, is what makes a statement an expression. This is because the == returns a value, usually 1 or 0, whereas = doesn't. In Java, C, and C++, an assignment is an expression, which is why confusing the assignment and comparison operators is a common programmer error (mostly in C and C++; Java has its own way of dealing with this problem).

The result is shown in the second example. Remember, an empty list indicates false. >>> def checkSeq(seq): ... if (seq): ... print "has item" ... else : ... print "empty" ... >>> non_empty_list = [1,2,3] >>> empty_list = [] >>> checkSeq(empty_list) empty >>> checkSeq(non_empty_list) has item Typically, if statements contain expressions that use comparison and logical operators. To illustrate, let's say that a woman is looking for her perfect man tall, dark, and handsome; the strong, quiet type between the ages of 27 and 35.

Note that the tuple argument containing a single item can be denoted with the % operator as item, or (item). Table 3-6. ' %cASCII character >>> "%c" % (97) 'a' >>> "%c" % 97 'a' >>> "%c" % (97) 'a' Table 3-7 shows how flags can be used with the format directives to add leading zeroes or spaces to a formatted number. They should be inserted immediately after the %. 56 57 Table 3-7. Format Directive Flags Flag Description Interactive Session#Forces octal to have a 0 prefix; forces hex to have a 0x prefix >>> "%#x" % 0xff '0xff' >>> "%#o" % 0377 '0ff' +Forces a positive number to have a sign >>> "%+d" % 100 '+100' -Left justification (default is right) >>> "%-5d, %-5d" % (10,10) '10 , 10 ' " "Precedes a positive number with a blank space >>> "% d,% d" % (-10, 10) '-100,10' 00 padding instead of spaces >>> "%05d" % (100,) '00100' Advanced Topic: Using the %d, %i, %f, and %e Directives for Formatting Numbers The % directives format numeric types: %i works with Integer; %f and %e work with Float with and without scientific notation, respectively.

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