Tải tài liệu Ziade expert python programming (372 trang)

... list of all the methods of a list Note that the returned list contains the names of the methods as strings, not the methods themselves d is a dictionary, so dir(d) returns a list of the names of ... context The real trick behind the and-or trick, then, is to make sure that the value of a is never false One common way of doing this is to turn a into [a] and b into [b], then taking the first ... Using the getattr function, you're getting a reference to the method function in the object module Now, printing the actual doc string of the method is easy The next piece of the puzzle is the...

... it's a wicked cool module, if you're ever inclined to dive into it on your own) Suffice it to say that copy can copy arbitrary Python objects, and that's how you're using it here The rest of the ... all the same keys and values, and strings are equal when they are the same length and contain the same sequence of characters For class instances, you can define the cmp method and code the comparison ... methods (like setitem ) and built-in attributes (like doc ) follow a standard naming convention: they both start with and end with two underscores Don't name your own methods and attributes this...

... alternate syntax that can help keep your expressions maintainable 7.5 Verbose Regular Expressions So far you've just been dealing with what I'll call “compact” regular expressions As you've seen, they ... move up to regular expressions In Python, all functionality related to regular expressions is contained in the re module Take a look at the first parameter: 'ROAD$' This is a simple regular expression ... really need is inline documentation Python allows you to this with something called verbose regular expressions A verbose regular expression is different from a compact regular expression in...

... """load XML input source, return parsed XML document - a URL of a remote XML file ("http://diveintopython.org/kant .xml" ) - a filename of a local XML file ("~/diveintopython/common/py/kant .xml" ) ... minidom >>> xmldoc = minidom.parse('~/diveintopython/common/py/kgp/binary .xml' ) >>> xmldoc >>> print xmldoc.toxml() < ?xml version="1.0" ?> >> from xml import dom >>> dom >>> import xml >>> xml Here you're importing a...