By Brett Slatkin
ISBN-10: 0134034287
ISBN-13: 9780134034287
“Each merchandise in Slatkin’s Effective Python teaches a self-contained lesson with its personal resource code. This makes the ebook random-access: goods are effortless to browse and examine in no matter what order the reader wishes. i'll be recommending Effective Python to scholars as an admirably compact resource of mainstream recommendation on a really vast diversity of issues for the intermediate Python programmer.”
—Brandon Rhodes, software program engineer at Dropbox and chair of PyCon 2016-2017
It’s effortless to begin coding with Python, that's why the language is so renowned. although, Python’s precise strengths, charms, and expressiveness might be challenging to know, and there are hidden pitfalls which may simply journey you up.
Effective Python can assist you grasp a really “Pythonic” method of programming, harnessing Python’s complete energy to put in writing tremendously strong and well-performing code. utilizing the concise, scenario-driven kind pioneered in Scott Meyers’ best-selling Effective C++, Brett Slatkin brings jointly fifty nine Python most sensible practices, suggestions, and shortcuts, and explains them with life like code examples.
Drawing on years of expertise construction Python infrastructure at Google, Slatkin uncovers little-known quirks and idioms that powerfully effect code habit and function. You’ll research how one can accomplish key projects, so that you can write code that’s more straightforward to appreciate, preserve, and improve.
Key gains include
- Actionable directions for all significant components of Python 3.x and 2.x improvement, with distinctive factors and examples
- Best practices for writing services that make clear goal, advertise reuse, and steer clear of bugs
- Coverage of the way to competently convey behaviors with periods and objects
- Guidance on find out how to stay away from pitfalls with metaclasses and dynamic attributes
- More effective techniques to concurrency and parallelism
- Better innovations and idioms for utilizing Python’s integrated modules
- Tools and most sensible practices for collaborative development
- Solutions for debugging, checking out, and optimization to be able to enhance caliber and performance
Read Online or Download Effective Python: 59 Specific Ways to Write Better Python PDF
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Additional resources for Effective Python: 59 Specific Ways to Write Better Python
Example text
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.