JoeCodeswell

A Python w3schools XPath Example

The w3schools XPath Examples are PRETTY GREAT.

However they are implemented using JavaScript. I mostly use Python so I thought I'd try to mimic the output using Python 3.10 with lxml on Windows 10.

1. Put the books.xml file in the same directory as the w3BooksTest.py .
2. Run with Python 3.10 on Windows with lxml installed

JoeCodeswell

/// C19data.dart
///   [gist](https://gist.github.com/JoeCodeswell/2f492c65c15a299f3176b06b0d178d5c)
///   [Dartpad](https://dartpad.dev/2f492c65c15a299f3176b06b0d178d5c)
/// Predecessor TimeSeriesC19.dart
///   C19app1Pj\jchart_c19\lib\c19_data.dart
///     [gist](https://gist.github.com/JoeCodeswell/cdff0e68ae266fa624eaac5c286f20b2)
///    https://dartpad.dev/cdff0e68ae266fa624eaac5c286f20b2
/// 
/// Because of the limitations of DartPad, this has moved to  
/// jchart_c19\C19DataSets.dart

JoeCodeswell

/// TimeSeriesC19.dart
/// C19app1Pj\jchart_c19\lib\c19_data.dart
///   [gist](https://gist.github.com/JoeCodeswell/cdff0e68ae266fa624eaac5c286f20b2)
/// https://dartpad.dev/cdff0e68ae266fa624eaac5c286f20b2
/// See VERY HELPFUL ANSWERS IN [Mapping JSON into Class Objects](https://stackoverflow.com/a/45189401/601770)
/// [HTML - Using getString() to load a file](https://dart.dev/tutorials/web/fetch-data#using-getString-function)
/// google: dart await result
/// [Asynchronous programming: futures, async, await](https://dart.dev/codelabs/async-await)
///
///

JoeCodeswell

/// zoldCode\dartTypicodeJsonDecodeProblem.dart
/// https://gist.github.com/JoeCodeswell/a565c505e8244bf9105048e874a6adc8
/// https://dartpad.dev/a565c505e8244bf9105048e874a6adc8
/// 
/// dart fails to jsonDecode valid json string from typicode Posts with \n in it 
///   https://github.com/dart-lang/convert/issues/10
/// 
/// to see non error behaviour comment out lines 29 & 30
/// 
/// 

JoeCodeswell

/// AsyncAwaitPlay.dart
/// Playing with AsyncAwait in dart. :)
/// https://gist.github.com/JoeCodeswell/04689586c58fca438a3906796463e719
/// https://dartpad.dev/04689586c58fca438a3906796463e719
void main() { }

void aFunction(){
  // 
}

JoeCodeswell

/// JSONplay.dart
/// Playing with JSON in dart. :)
/// https://gist.github.com/JoeCodeswell/864394a7d86087113a7ad2ef2d80d542
/// https://dartpad.dev/864394a7d86087113a7ad2ef2d80d542
/// google: dart json
///   [Using JSON](https://dart.dev/guides/json)
///     [dart:convert - decoding and encoding JSON, UTF-8, and more](https://dart.dev/guides/libraries/library-tour#dartconvert---decoding-and-encoding-json-utf-8-and-more)
///       [dart:convert library](https://api.dart.dev/stable/2.8.4/dart-convert/dart-convert-library.html)
///         [How to parse Json in Flutter for Beginners](https://medium.com/flutter-community/how-to-parse-json-in-flutter-for-beginners-8074a68d7a79)
///   [JSON and serialization](https://flutter.dev/docs/development/data-and-backend/json)

JoeCodeswell

/// [List Comprehensions in Dart](https://medium.com/@DavidMPotter/list-comprehensions-in-dart-a57d3a06b703)
/// https://gist.github.com/JoeCodeswell/ListComprehensionsInDart.dart
/// /// https://dartpad.dev/18472e3fc8e84ed7ece391b8dc6a3ced
///

void main() {
  
  var intList = [1, 2, 3, 4];
  
  // py [x + 1 for x in intList]

JoeCodeswell

void main() {
  // DartDataTableExp1
  // https://gist.github.com/JoeCodeswell/34f5fca2d4e3df65155189b3be033da3
  // https://dartpad.dev/34f5fca2d4e3df65155189b3be033da3
  JoesDataList jdl = JoesDataList();
  
  print(jdl.listOfDataItems[0].name); // Sarah
  print(' ');
  // jdl.Map(); // The method 'Map' isn't defined for the type 'JoesDataList' - line 4
  

JoeCodeswell

// https://dartpad.dev/e31c87278033dbaf3bb4d55bfa8fd721
// e31c87278033dbaf3bb4d55bfa8fd721
// [Dart Final vs. Const](https://www.appbrewery.co/courses/548873/lectures/9988849)
void main() {
  
  // int myNumber = 1; // if we want no change after this
  // use `const` OR `final`
  // const int myConst = 2;
  // final int myFinal = 3;
  

JoeCodeswell

// on dartpad:  https://dartpad.dev/391f0c9c13d49962573a83b0ce9fc305
import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {