string-concatenation

问题 There are two solutions from Concatenate tab-delimited txt files vertically Suppose input1 is X\tY input2 is A\tB\r\n C\t\r\n Here, A, B, C are ordinary words and \t is tab. If I run filenames = [input1, input2] with open(output, 'w') as outfile: for fname in filenames: with open(fname) as infile: outfile.write(infile.read().rstrip() + '\n') then I get X\tY\r\n A\tB\r\n C Suddenly \t after C disappears. If I run filenames = [input1, input2] with open(output, 'w') as outfile: for fname in

问题 NOTE: Path of python.exe has already been set I am trying to create a Java program that passes the variable args (or any other variable) to a Python script. import java.io.*; public class PythonCallTest{ public static void main (String[] args){ String s = null; Runtime r = Runtime.getRuntime(); try{ Process p = r.exec("cmd /c python ps.py+",args); BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream())); BufferedReader stdError = new BufferedReader(new

问题 I have a table which contains lots of NULLs in the email field. What I need to do is updating all the NULL rows. For every NULL row, I need to execture a stored procedure which basically gets all the emails related to that user's ID. Therefore, for every NULL row, this stored procedure is called and all the email fields found within this stored procedure need to be concatenated together and inserted in place of the NULL email field from the other table. Anyone knows how to implement this in

问题 Recently we found a couple of bugs in our code based because a developer forgot to add a comma in the middle of a list of strings and python just concatenated the strings. look below: The intended list was: ["abc", "def"] Developer wrote: ["abc" "def"] and we got: ["abcdef"] now I am concerned over similar mistakes in other part of the code, is this functionality a core part of python? is it possible to disable it? 回答1: Yes, this is a core part of python: Multiple adjacent string literals

问题 If I have the below XML <div> <p>1</p> </div> <div> <p>2</p> 3 </div> <div> <p>4</p> 5 <p>6</p> </div> How to specify a xpath to return a array of strings like this: { 1, 2, 46 } All attempts I did returned the following result: { 1, 2, 4, 6} 回答1: Here you are concat(string-join(//div[count(p) = 1]/p, ',') , ',' , string-join(//div[count(p) > 1]/string-join(p, ''), ',')) will return 1,2,46 As you will need to concatenate some p tags under the same div tag so in all the cases this will result

问题 I've got a method like this: private String getOrderListAsString() { StringBuilder str = new StringBuilder(); str.append("Sell list:"); for (Order o : sellOrderList) { str.append("\nSale: ").append(o); } str.append("Buy list:"); for (Order o : buyOrderList) { str.append("\nBuy: ").append(o); } return str.toString(); } It's called with logging parameterization like so: We're using java.util.logging as a logger. logger.log(Level.INFO, "{0}", getOrderListAsString()); The problem is that the

问题 I've got a method like this: private String getOrderListAsString() { StringBuilder str = new StringBuilder(); str.append("Sell list:"); for (Order o : sellOrderList) { str.append("\nSale: ").append(o); } str.append("Buy list:"); for (Order o : buyOrderList) { str.append("\nBuy: ").append(o); } return str.toString(); } It's called with logging parameterization like so: We're using java.util.logging as a logger. logger.log(Level.INFO, "{0}", getOrderListAsString()); The problem is that the

问题 What I want to achieve is simple, in R I can do things like paste0("https\\",1:10,"whatever",11:20) , how to do such in Python? I found sme things here, but only allow for : paste0("https\\",1:10) . anyone know how to figure this out, this must be easy to do but I can not find how. 回答1: @Jason , I will suggest you to use any of these following 2 ways to do this task. ✓ By creating a list of texts using list comprehension and zip() function. Note: To print \ on screen, use escape sequence \\ .

问题 As the title suggests, I was wondering how to concat two fields in a where clause in mysql . This is an example of what I'm trying to achieve : SELECT CONCAT_WS(' ', first_name, last_name) AS name FROM `users` WHERE name LIKE "%John Doe%" The point is that first_name and last_name are separate fields, and I want to enable my PHP application to search for a full person's name. Any tips? Cheers! 回答1: Try this :: SELECT CONCAT_WS(' ', first_name, last_name) AS name FROM `users` WHERE CONCAT_WS('

问题 This question already has answers here : Closed 9 years ago . Possible Duplicate: How should I concatenate strings? There are several ways to concat strings in everyday tasks when performance is not important . result = a + ":" + b result = string.Concat(a, ":", c) result = string.Format("{0}:{1}", a, b); StringBuilder approach ... ? what do you prefer and why if efficiency doesn't matter but you want to keep the code most readable for your taste? 回答1: It depends on the use. When you just