for-loop

问题 This question has been asked and answered plenty of times before. However, I'm specifically asking for the substrings to be printed in the specific order by each letter as shown in the output. import java.util.*; public static void main(String[] args) { breakWordIntoPieces("ABIGWORD"); } public static void breakWordIntoPieces(String str) { if (str.length() > 1) // I'm skipping all substrings of less than 2 letters { List<String> fragments = breakWordIntoPiecesFromRightToLeft(str); for (String

问题 what-is-the-meaning-of-curly-braces says that they are used for dictionaries, but what about this example? resp = { requests.get('http://localhost:8000') for i in range(20) } Taken from here (actually it uses [] , but it works with {} as well). What is the meaning of this, and why is this loop upside-down? 回答1: Curly braces are also used for sets. This is a set comprehension . It creates the set of 20 requests.get objects, keeping only the unique ones. If you use [] instead of {} it is a list

问题 what-is-the-meaning-of-curly-braces says that they are used for dictionaries, but what about this example? resp = { requests.get('http://localhost:8000') for i in range(20) } Taken from here (actually it uses [] , but it works with {} as well). What is the meaning of this, and why is this loop upside-down? 回答1: Curly braces are also used for sets. This is a set comprehension . It creates the set of 20 requests.get objects, keeping only the unique ones. If you use [] instead of {} it is a list

问题 I was using the following batch command to retrieve all local user profiles (including domain users too) : for /f "delims=" %%I in ('dir /a:d-h /b "%SystemDrive%\Users\*" 2^>nul ^| %SystemRoot%\System32\findstr.exe /i /l /x /v /g:"%bin%\exclude_users.txt"') do ( The problem is that this command has its limits: it doesn't really check if the users in question do actually have an account. The user Compo provided me a methodology for retrieving the profile names, using WMIC. So I ended up

问题 Having a ParseObject object how can I loop through its fields and get the name of the field along with the value of it? This would really help me minimize my code. 回答1: Hmm, ParseObject contains key-value pairs, and I think you can't iterate though it. But. I found something called .keySet() method of ParseObject. It returns ... well, the set of keys (excluding createdAt, updatedAt, authData, or objectId). I think you can convert it into an array and iterate trhough it? Something like this:

问题 I am trying to get the column names from a csv file with nearly 4000 rows. There are about 14 columns. I am trying to get each column and store it into a list and then prompt the user to enter themselves at least 5 columns they want to look at. The user should then be able to type how many results they want to see (they should be the smallest results from that column). For example, if they choose clothing_brand, "8", the 8 least expensive brands are displayed. So far, I have been able to use

问题 I am trying to get the column names from a csv file with nearly 4000 rows. There are about 14 columns. I am trying to get each column and store it into a list and then prompt the user to enter themselves at least 5 columns they want to look at. The user should then be able to type how many results they want to see (they should be the smallest results from that column). For example, if they choose clothing_brand, "8", the 8 least expensive brands are displayed. So far, I have been able to use

问题 I want to list all possible ways to concatenate a list of strings, example: Input: strings = ['hat','bag','cab'] Output: concatenated = ['hatbag','hatcab','hatbagcab','hatcabbag','baghat','bagcab', 'baghatcab','bagcabhat','cabhat','cabbag','cabhatbag','cabbaghat'] I've tried using for loops for this simple 3 string list, but I can't figure out how to do it with many strings in the list. Can someone please help? 回答1: This is a great case for the itertools module. You're looking for

问题 Hi im trying to code the following coefiicient matrix A in a for loop in Matlab. N is the total number of elements. And i and j are obtained from k . Could someone help me please code the A matrix correctly for any N value. The A and b are shown for k = 1:N A(k,k) = 4; % the diagonal element, corresponding to Tij, is always 4 % In the following, we look at the four neighbours of (i,j) that are % involved in the 5-point formula i = mod(k-1,nx)+1; j = (k-i)/nx+1; %get (i,j) from k %boundary

问题 I have a quantitative dataset from a survey. I want to plot fit triangular distribution for the values I have (minimum lb, maximum ub, and mode ml). Mind you, I am using rtriang() as my data does not contain quantiles to which a density function can be fitted. At least that is my understanding. This piece of code returns a lot of separate graphs. I want to display the geom_density objects for each i (or respondent) into one graph. How would I achieve this? scenarios <- c("s1", "s2") questions