By Magnus Lie Hetland
Achieve a primary realizing of Python's syntax and lines with the second one variation of starting Python, an up–to–date creation and useful reference. overlaying a wide range of Python–related programming subject matters, together with addressing language internals, database integration, community programming, and net prone, you'll be guided by way of sound improvement rules. Ten accompanying tasks will make sure you can get your palms soiled in no time.
Updated to mirror the most recent in Python programming paradigms and several other of the main an important good points present in Python 3.0 (otherwise often called Python 3000), complicated themes, corresponding to extending Python and packaging/distributing Python functions, also are coated.
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Additional resources for Beginning Python: From Novice to Professional (2nd Edition)
So what do we do? We can escape the backslash itself: >>> print 'C:\\nowhere' C:\nowhere This is just fine. But for long paths, you wind up with a lot of backslashes: path = 'C:\\Program Files\\fnord\\foo\\bar\\baz\\frozz\\bozz' Raw strings are useful in such cases. They don’t treat the backslash as a special character at all. Every character you put into a raw string stays the way you wrote it: >>> print r'C:\nowhere' C:\nowhere >>> print r'C:\Program Files\fnord\foo\bar\baz\frozz\bozz' C:\Program Files\fnord\foo\bar\baz\frozz\bozz As you can see, raw strings are prefixed with an r.
Note that because of the distinctive enclosing quotes, both single and double quotes are allowed inside, without being backslashescaped. ■Tip Ordinary strings can also span several lines. If the last character on a line is a backslash, the line break itself is “escaped” and ignored. " would print out Hello, world!. 12 In ordinary strings, the backslash has a special role: it escapes things, letting you put things into your string that you couldn’t normally write directly. ' Hello, world! This is normally just dandy, but in some cases, it’s not what you want.
It’s always a good idea to make your code readable on its own as well, even without the comments. Luckily, Python is an excellent language for writing readable programs. " stuff about? Let’s tackle the "Hello" part first and leave raw_input for later. " It is customary to begin with a program like this in programming tutorials. The problem is that I haven’t really explained how it works yet. "? It’s called a string (as in “a string of characters”). Strings are found in almost every useful, real-world Python program and have many uses.
Beginning Python: From Novice to Professional (2nd Edition) by Magnus Lie Hetland