On 16/09/17 01:32, mikn...@gmail.com wrote: > I really need some Python help. I’m a beginner and have some hw for class:
OK, Usual caveat: we don;t do your homework, just give hints. > Write a program that calculates longest substring of increasing letters in > st, say st=‘Supercalifragilisticexpialidocious’. Do it in a few steps: I'm assuming that means a string where each letter is higher than the previous one, such as 'best'? > 1.Find longest increasing substring starting from 0th position, > use comparison <= to check if one letter greater than other You don't tell us about how much Python or programming experience you have so I'll assume its near zero and apologize if I'm pitching too low. Do you know how to write some code to check each letter in a string, one by one? If so could you write a short program to test whether a string is increasing? ie start at the beginning and check whether each letter is greater than the previous one. If you can do that then the rest of the homework becomes much easier. Do you know how to define your own function? If so that will also make things slightly simpler. > 2. Use function len of object str(ing) to find length of string > 3.Write one line of code that choses longest string from 2 If you can do 2 then 3 is trivial. For example if we have two strings: s1 = 'Python' s2 = 'Perl' Can you write code to display the lengths of s1 and s2? Can you then write a single line of code that chooses which string is longesst? > 4. Loop through all possible starting position start> of the str, and find > longest increasing substring of st. This is combining step 1 with steps 2 and 3. > I have no idea where to start this problem. Start with 1 above. Write some code to determine if a string is an increasing string. If you know how put it in a function, but that's a nice to have... If you get stuck come back here and show us the code and any error messages you get. We'll try to help you fix it. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
