.net 类似python写法例子

 1 // [3]*10
 2 Enumerable.Range(0,10).ToArray();
 3 
 4 // [X*2 for x in range(5) if x%3==0]
 5 Enumerable.Range(0, 5).Select(x=>x*2).ToArray();
 6 
 7 // mat =[[0]*5 for _ in range(5)]
 8 var mat = Enumerable.Range(0, 5).Select(_=> Enumerable.Repeat(0, 5).ToArray()).ToArray();
 9 var mat2 = new int[5,5];
10 
11 var s_ = new string ('-', 20);
12 
13 var arr = Enumerable.Range(0, 20).ToArray();
14 var t = arr[..^10];
15 
16 var t2 =  "hello, world"[2..8];
17 
18 var t3 = arr.Skip(2).SkipLast(5);
19 
20 var s = "hello";
21 foreach (var (i,c)  in Enumerable(s, 1)){
22   Console.WriteLine(i, c);
23 }
24 
25 IEnumerable<(int , T)> Enumerable<T>(IEnumerable<T> items, int start=0){
26   int i = start;
27   foreach(var it in items){
28     yield return (i++, it);
29   }
30 }
31 
32 var a = new int []{1, 2,3,4,5};
33 foreach(var p in s.Zip(a)){
34   Console.WriteLine(p);
35 }
36 
37 foreach(var (i, c) in Enumerable.Range(1, s.Length).Zip(s)){
38   Console.WriteLine(i, c);
39 }
40 
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42 //www.nerdfonts.com