for-loop

问题 I am new to python, and need some help with a question I am having regarding the date time function. I have df_a which has a column titled time , and I am trying to create a new column id in this df_a . I want the id column to be determined by whether or not the time is contained within a range of times on df_b columns between "date" and "date_new", for example the first row has a date of "2019-01-07 20:52:41" and "date_new" of "2019-01-07 21:07:41" (a 15 minute time interval), I would like

问题 I was having a go at the following problem from the AIO (Australian Informatics Olympiad) Training Problems Site (Question in Italics and specifics in bold, my attempt below): The Problem Encyclopaedia Input File: encyin.txt Output File: encyout.txt Time Limit: 1 second Once again it is quiz night at the My Very First Encyclopedia Appreciation Society. For week after week, you have turned up to these quizzes, deftly answering question after question about zoo animals and days of the week,

问题 I was having a go at the following problem from the AIO (Australian Informatics Olympiad) Training Problems Site (Question in Italics and specifics in bold, my attempt below): The Problem Encyclopaedia Input File: encyin.txt Output File: encyout.txt Time Limit: 1 second Once again it is quiz night at the My Very First Encyclopedia Appreciation Society. For week after week, you have turned up to these quizzes, deftly answering question after question about zoo animals and days of the week,

问题 I have a loop like foreach ($_GET as $name => $value) { echo "$value\n"; } And I want to add a comma in between each item so it ends up like this. var1, var2, var3 Since I am using foreach I have no way to tell what iteration number I am on. How could I do that? 回答1: Just build your output with your foreach and then implode that array and output the result : $out = array(); foreach ($_GET as $name => $value) { array_push($out, "$name: $value"); } echo implode(', ', $out); 回答2: Like this:

问题 I'm currently learning Python as I'm taking a data mining class. I was making a for-loop to make a noisy data file to do smoothing and I found a peculiarity on Python for-loop that I couldn't understand nor go around. So I made this simple testing C++ and Python codes. C++ one works, but Python one doesn't. The reason is that C++ allows arbitrary updates on the counter variable i within the for-loop block, but Python doesn't. On Python code, I try to update i arbitrarily by doing i += 1

问题 I'm creating coordinate plane Three in a row game so I have to find out if there are three numbers of the same value in the array BUT WITHOUT sorting array because the array represents the x-coordinates of the points added to the coordinate plane during the game... For example, let's say that I've added 6 points to the coordinate plane with x-coordinates stored in next array: var arr = [2,2,3,2,7,3]; I need the loop that will count only the occurrences of the value 2 because the number 2

问题 I'm creating coordinate plane Three in a row game so I have to find out if there are three numbers of the same value in the array BUT WITHOUT sorting array because the array represents the x-coordinates of the points added to the coordinate plane during the game... For example, let's say that I've added 6 points to the coordinate plane with x-coordinates stored in next array: var arr = [2,2,3,2,7,3]; I need the loop that will count only the occurrences of the value 2 because the number 2

问题 Working Environment: Excel 2013 Target: Delete the unnecessary columns by filtering the content in row 2. My idea is that as long as the content in row 2 is either Physical Location or PLC Tag Name or Test Step1/2/3/4/5/6/7 , keep those columns, otherwise delete it. My problem is that I need to run this macro multiple times to delete all the unnecessary columns. It should loop from 1 to 40, and just leave the columns that I want. I am not sure why it doesn't work. Can anyone help me? Thanks!

问题 I have a loop with several If statements in Excel VBA. This goes through and hides certain rows based on certain criteria. Basicially, if one of the statements is true then the row is hidden. Since only one of the statements has to be true for the row to be hidden it would be pointless for the rest of the statements to be tested once one of the statements is found to be true. How would I put in a line of code that would say to move onto the next iteration of the loop once the if statement is

问题 I am trying to find an empty cell in a specific column in google sheets. I am familiar with getLastRow(), but it returns the last row in whole sheet. I want to get the first empty cell in a specific column. So, I used a for loop and if. But I don't know why it is not working. The problem is that for loop does not return anything. I am getting 10 rows of the column H (position 8) in the sheet test (line2). first 5 rows already have content. Data will be added to this cell later using another