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问题 I have a working code to print random lines from a csv column. #!/usr/bin/python import csv import random **col**=2 with open('<filename>','r') as f: reader=csv.reader(f) data=[row[col] for row in reader] from random import shuffle shuffle(data) print '\n'.join(data[:**100**]) f.close(); I want to paramaterize this script. by passing , position (col) & sample (e.g. 100 values) I am unable to find a decent tutorial which would explain this. any thoughts ? 回答1: You can use the sys module like

问题 I want to parse the following xml structure: <?xml version="1.0" encoding="utf-8"?> <documents> <document> <element name="title"> <value><![CDATA[Personnel changes: Müller]]></value> </element> </document> </documents> For parsing this element name="????? structure I use XPath in the following way: XPath xPath = XPathFactory.newInstance().newXPath(); String currentString = (String) xPath.evaluate("/documents/document/element[@name='title']/value",pCurrentXMLAsDOM, XPathConstants.STRING); The

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 9 months ago . Improve this question I'm looking forward to deploying my Spring Application on a production environment and i'd like to include some basic and solid security measures. First things first, i extended WebSecurityConfigurerAdapter into my SecurityConfiguration.java

问题 I'm trying to learn how to make plugins work in Angular, however after adding systemjs I get the following error: Uncaught ReferenceError: SystemJS is not defined I implemented systemjs like this: import { System } from 'systemjs'; declare const SystemJS: System; import * as angularCore from '@angular/core'; import * as angularCommon from '@angular/common'; import * as angularCommonHttp from '@angular/common/http'; import * as angularForms from '@angular/forms'; import * as angularAnimations

问题 I got a QTreewidget, which i want to be as small as possible, with probably only one branch. But i want the size to change accordingly to how that expands or collapses. As well as start out with a size that fits the filled part of the widget. I make the QTreewidget by adding QTreeWidgetItems, which got the TreeWidget as parent, and then making QTreeWidgetItems again which got the above QTreeWidgetItem as parent. Right now, it starts like left image, but i want it to start like the right one.

问题 how can use JS variable in PHP like this ? <script> x = document.getElementById(1).value; var listOf = <?php echo $listOf[x]; ?>; </script> this doesn't work :( 回答1: And rightfully so. PHP is executed on the server , while JavaScript is executed in the client's browser . Those are two different contexts and the variables from one are not visible in the second. You need to have your PHP script output a JavaScript version of the array and then use this one in your script. Something like this: <

问题 I'm trying to make a massive delete, in order to do that I have an Array<number> of the ids I want to delete. I can't pass this array as a parameter to the method this._httpService.delete(uri,options) . The type of _httpService is Http . So I'm looping the array and inside the loop I'm making single calls, but each call is async and I have certain logic to run when the loop ends. 回答1: Actually you can send the id array in the body of a DELETE request, according to this answer, like so: http

问题 I am trying to access the following API URL and convert it into a Pandas DataFrame: http://api.scb.se/OV0104/v1/doris/sv/ssd/START/BE/BE0101/BE0101A/BefolkningR1860 My goal is to read this JSON file into a pandas data frame and display years as index and the population of Sweden as values. These are the values for each year: - 2012: 9 555 893 - 2013: 9 644 864 - 2014: 9 747 355 My solution looks like this so far: import pandas as pd url = 'http://api.scb.se/OV0104/v1/doris/sv/ssd/START/BE

问题 After seeing the method signature of map in scala as def map[A, B](l: List[A])(f: A => B): List[B] = ??? my layman undersanting of [A, B] in above is that they signal the method that we'll be exclusively working with generic Type A and B in the defined method. Now I go on to implement a method to add values from two lists consquetively (basically zipWith) using similar coding pattern. def addCorresponding[Int](l1: List[Int], l2: List[Int]): List[Int] = (l1, l2) match { case (_, Nil) => Nil

问题 I got a QTreewidget, which i want to be as small as possible, with probably only one branch. But i want the size to change accordingly to how that expands or collapses. As well as start out with a size that fits the filled part of the widget. I make the QTreewidget by adding QTreeWidgetItems, which got the TreeWidget as parent, and then making QTreeWidgetItems again which got the above QTreeWidgetItem as parent. Right now, it starts like left image, but i want it to start like the right one.