小编The*_*nce的帖子

a = [1,2,3,4]
b = a << 5
a == [1,2,3,4] # returns false

如何分配b到a与5追加到末尾,而无需修改a本身？

(我是初学者)Python通常使用缩进来指定代码行的嵌套级别.有没有其他方法可以做到这一点？

我想用西班牙语而不是英语用Python编程.如何为if和等关键字定义别名for？

module Digits
type Digit = Unison | Semitone | Tone | MinorThird | MajorThird | PerfectFourth | AugmentedFourth | PerfectFifth | MinorSixth | MajorSixth | MinorSeventh | MajorSeventh type 'd GeneralizedDigit = SmallDigit of 'd | Octave type 't Number = EmptyNumber | CountedNumber of 't * 't Number
let swapOctave: Digit GeneralizedDigit -> Digit GeneralizedDigit = fun x -> match x with SmallDigit Unison -> Octave | Octave -> SmallDigit Unison | g -> g
let limitLength: 'r Number …

我在Monad.Reader问题22中找到了这个:

data Color = R | B
data Node a = E | N Color (Node a) a (Node a)
type Tree a = Node a

为什么不呢？

data Node a = E | N Bool (Node a) a (Node a)
type Tree a = Node a