loops

问题 Hey I'm a beginner programmer who is starting with python and am starting out by making a game in pygames. The game basically spawns in circles at random positions, and when clicked give you points. Recently i've hit a roadblock when I want to spawn in multiple instances of the same object(in this case circles) at the same time. I've tried stuff like sleep() and some other code related to counters, but it always results in the next circle spawned overriding the previous one(i.e the program

问题 Hey I'm a beginner programmer who is starting with python and am starting out by making a game in pygames. The game basically spawns in circles at random positions, and when clicked give you points. Recently i've hit a roadblock when I want to spawn in multiple instances of the same object(in this case circles) at the same time. I've tried stuff like sleep() and some other code related to counters, but it always results in the next circle spawned overriding the previous one(i.e the program

问题 Good afternoon, Somewhat new to Python and webscraping, so any help would be greatly appreciated! First: The Code from selenium import webdriver import time chrome_path = r"/Users/ENTER/Desktop/chromedriver" driver = webdriver.Chrome(chrome_path) site_url = 'https://www.home-school.com/groups/' driver.get(site_url) # get state links from sidebar and store to list area = driver.find_element_by_xpath("""/html/body/center/table/tbody/tr/td/table[3]/tbody/tr/td[2]/div""") items = area.find

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 6 years ago . Improve this question I have basically two vectors one for a large number of elements and a second for a small number of probes used to sample data of the elements. I stumbled upon the question in which order to implement the two loops. Naturally I thought having the outer loop over the larger

问题 I was try to add click event on dynamical ID's on a table row. I have set row ID to each row of a table. Now I want to add click event to show a row (class="hidden")slidedown in toggle. Actually the table row will print through a loop using classic asp code. <table id="bus-list" class="table table-bordered table-result"> <thead style="background-color: #FCA04E"> <tr> <th>Bus Operator</th> <th>Bus Type</th> <th>Depart</th> <th>Arrive</th> <th>Duration</th> <th>#</th> </tr> </thead> <tbody> <tr

问题 I have 39 json files stored in a folder. They all have three columns in common: MOVEMENT_ID , DISPLAY_NAME and geometry . I would like to arrive at a dataset containing the data from all files, organised into these columns. I am using a for loop to do so. path = "~/geoboundaries" #path to the folder where the files are stored file.names=as.list(dir(path, pattern='.json', full.names=T)) #make a list of all file names out.file=st_sf(MOVEMENT_ID=factor(), DISPLAY_NAME=factor(), geometry=st_sfc()

问题 I have written the below code but i would like the macro to repeat this process, copying the next row down in the SS21 Master Sheet until that row is blank (the end of the table). Something like this? Sub Run_Buysheet() Sheets("SS21 Master Sheet").Range("A1:AH1, AJ1:AK1, AQ1").Copy Destination:=Sheets("BUYSHEET").Range("A1") Sheets("SS21 Master Sheet").Range("A2:AH2, AJ2:AK2, AQ2").Copy Destination:=Sheets("BUYSHEET").Range("A" & Rows.Count).End(xlUp).Offset(1, 0) Dim r As Range, i As Long,

问题 I have written the below code but i would like the macro to repeat this process, copying the next row down in the SS21 Master Sheet until that row is blank (the end of the table). Something like this? Sub Run_Buysheet() Sheets("SS21 Master Sheet").Range("A1:AH1, AJ1:AK1, AQ1").Copy Destination:=Sheets("BUYSHEET").Range("A1") Sheets("SS21 Master Sheet").Range("A2:AH2, AJ2:AK2, AQ2").Copy Destination:=Sheets("BUYSHEET").Range("A" & Rows.Count).End(xlUp).Offset(1, 0) Dim r As Range, i As Long,

问题 I have a a dataframe that looks like this: link <- c("http://www.sciencedirect.com/science/article/pii/S1042957318300366", "http://www.sciencedirect.com/science/article/pii/S1042957318300664", "http://www.sciencedirect.com/science/article/pii/S1042957318300627", "http://www.sciencedirect.com/science/article/pii/S002205311830156X", "http://www.sciencedirect.com/science/article/pii/S1090951618303419", "http://hdl.handle.net/10.1093/jjfinec/nby006") repec_id <- c("RePEc:eee:jfinin:v:38:y:2019:i

问题 These days I see this very often: for (int i = 0; i < NUMBER; ++i) Rather than - as was very much the fashion (?) 20 years ago - this: for (int i = 0; i < NUMBER; i++) Is there a reason for this change or is it just fashion? (There is a similar question about Java here but I don't think the answers get to the heart of the matter) 回答1: It's mostly fashion, but also a combination of consistency and misunderstanding. When iterators came along, and more and more people started realising that ++it