.net 类似python写法例子

// [3]*10
Enumerable.Range(0,10).ToArray();

// [X*2 for x in range(5) if x%3==0]
Enumerable.Range(0, 5).Select(x=>x*2).ToArray();

// mat =[[0]*5 for _ in range(5)]
var mat = Enumerable.Range(0, 5).Select(_=> Enumerable.Repeat(0, 5).ToArray()).ToArray();
var mat2 = new int[5,5];

var s_ = new string ('-', 20);

var arr = Enumerable.Range(0, 20).ToArray();
var t = arr[..^10];

var t2 =  "hello, world"[2..8];

var t3 = arr.Skip(2).SkipLast(5);

var s = "hello";
foreach (var (i,c)  in Enumerable(s, 1)){
  Console.WriteLine(i, c);
}

IEnumerable<(int , T)> Enumerable<T>(IEnumerable<T> items, int start=0){
  int i = start;
  foreach(var it in items){
    yield return (i++, it);
  }
}

var a = new int []{1, 2,3,4,5};
foreach(var p in s.Zip(a)){
  Console.WriteLine(p);
}

foreach(var (i, c) in Enumerable.Range(1, s.Length).Zip(s)){
  Console.WriteLine(i, c);
}

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