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Python printf
To format data into a string in python, use the % operator as python doesn't have an sprintf or printf function. So why have I entitled today's entry "python printf? Because this in one of the most frequently asked, and infrequently answered questions.
The % operator with a string to its left formats the value to the right using the (sprintf style) string to to the left of the operator. Where you want to format more that one value, use a tuple to the right. Here's an example in which I've formatted an integer to return a three digit number padded with leading zeros: >>> licensed = 7 We've got an example using a tuple in our course material and there's an example using a format string variable and aligning output columns in python there too. There is further documentation of pythons' % operator on the Python documentation site (well hidden, so I give you the link!) Aside - why no printf in python? Because you don't need it and the alternative is neater and better. Arguably, there shouldn't be a printf function in any other language either, as it both formats the values AND sends them to the output channel - doing two logical operations in a single call, and you're bound to want to separate them at some stage. Instead, there should be two functions. There usually are ... and from a purist's viewpoint, sprintf followed by echo or print is much more maintainable that a single sprintf. (written 2005-11-15 23:13:47) Associated topics are indexed under Y108 - Python - String Handling
Some other Articles
Bowerhill, Melksham, 2006 CalendarGood IT training cannot be cheap Why is Tomcat called Tomcat? I have a river to cross Python printf More spam - a success story MySQL - a score of things to remember Running a Perl script within a PHP page New Navigation Aid - Launch of My Wellho Being atypical is typical 1633 posts, page by page
Link to page ... 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 at 50 posts per pageThis is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price. Link to Ezine home page (for reading). Link to Blogging home page (to add comments). |
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