By Alex Martelli
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Portable, robust, and a breeze to exploit, Python is the preferred open resource object-oriented programming language used for either standalone courses and scripting functions. it's now getting used by means of more and more significant agencies, together with NASA and Google. up to date for Python 2.4, The Python Cookbook, second version deals a wealth of valuable code for all Python programmers, not only complex practitioners. Like its predecessor, the recent version offers ideas to difficulties that Python programmers face daily. It now comprises over two hundred recipes that diversity from basic projects, akin to operating with dictionaries and record comprehensions, to complicated initiatives, corresponding to tracking a community and construction a templating method. This revised model additionally contains new chapters on issues similar to time, cash, and metaprogramming. Here's an inventory of extra themes lined: * Manipulating textual content
* looking and sorting
* operating with documents and the filesystem
* Object-oriented programming
* facing threads and procedures
* approach management
* Interacting with databases
* developing consumer interfaces
* community and net programming
* Processing XML
* dispensed programming
* Debugging and testing
one other good thing about The Python Cookbook, second version is its trio of authors--three famous Python programming specialists, who're hugely noticeable on e mail lists and in newsgroups, and communicate frequently at Python meetings. With ratings of functional examples and pertinent heritage info, The Python Cookbook, second version is the single resource you wish if you're trying to construct effective, versatile, scalable, and well-integrated systems.
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Alt. ISBN:9780596007973
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Solution You can build a list whose items are the string's characters (meaning that the items are strings, each of length of onePython doesn't have a special type for "characters" as distinct from strings). Just call the built-in list, with the string as its argument: thelist = list(thestring) You may not even need to build the list, since you can loop directly on the string with a for statement: for c in thestring: do_something_with(c) or in the for clause of a list comprehension: results = [do_something_with(c) for c in thestring] or, with exactly the same effects as this list comprehension, you can call a function on each character with the map built-in function: results = map(do_something, thestring) Discussion In Python, characters are just strings of length one.
Processing a String One Character at a Time Credit: Luther Blissett Problem You want to process a string one character at a time. Solution You can build a list whose items are the string's characters (meaning that the items are strings, each of length of onePython doesn't have a special type for "characters" as distinct from strings). Just call the built-in list, with the string as its argument: thelist = list(thestring) You may not even need to build the list, since you can loop directly on the string with a for statement: for c in thestring: do_something_with(c) or in the for clause of a list comprehension: results = [do_something_with(c) for c in thestring] or, with exactly the same effects as this list comprehension, you can call a function on each character with the map built-in function: results = map(do_something, thestring) Discussion In Python, characters are just strings of length one.
When the pieces are not all available at the same time, but rather come in sequentially from input or computation, use a list as an intermediate data structure to hold the pieces (to add items at the end of a list, you can call the append or extend methods of the list). join(thelist) to obtain the big string that's the concatenation of all pieces. Of all the many handy tips and tricks I could give you about Python strings, I consider this one by far the most significant: the most frequent reason some Python programs are too slow is that they build up big strings with + or +=.