Question

我在python上有以下代码：

f = open("configuration.txt", "r")
position = {}
counter = 0
with open("configuration.txt") as fileobj:
    for line in fileobj:
        for ch in line:
            if ch.isdigit():
                position[int(ch)] = counter
        counter+=1
# print(dict(sorted(position.items())))

position = dict(sorted(position.items()))
diskPositions = list(position.values())

disk = {0:'4',1:'3',2:'2',3:'1'}
pegs = {0:'A',1:'B',2:'C'}
# print(position)
def moveDisks(diskPositions, largestToMove, targetPeg):
    for badDisk in range(largestToMove, len(diskPositions)):
        currentPeg = diskPositions[badDisk]
        if diskPositions[badDisk] != targetPeg:
            otherPeg = 3 - targetPeg - currentPeg
            moveDisks(diskPositions, badDisk + 1, otherPeg)
            print(disk[badDisk], "-", pegs[targetPeg])
            diskPositions[badDisk] = targetPeg
            moveDisks(diskPositions, badDisk + 1, targetPeg)
            break;

moveDisks(diskPositions[::-1], 0, 2)

我需要将此代码转换为ruby。我开始这样做，但是我被卡住了，不知道错误在哪里，或者我在做什么不同。

当我运行它时，我在第30行收到由nil变量引起的以下错误：

/hanoi/final.rb:30:in `-': nil can't be coerced into Integer (TypeError)```

Ruby代码：

f = open("configuration.txt", "r")
position = {}
counter = 0

def is_digit(look_ahead)
  look_ahead =~ /[[:digit:]]/
end

File.open('configuration.txt', 'r') do |f|
  f.each_line do |l| # iterate on each character
    l.each_char do |c|
      if is_digit(c)
        position[c.to_i] = counter
      end
    end
    counter+=1
  end
end

position = position.sort.to_h
disk_positions = position.values

disk = {0 => '4', 1 => '3', 2 => '2', 3 => '1'}
pegs = {0 => 'A', 1 => 'B', 2 => 'C'}

def moveDisks(diskPositions, largestToMove, targetPeg)
  for badDisk in (largestToMove..diskPositions.length)
    currentPeg = diskPositions[badDisk]
    if diskPositions[badDisk] != targetPeg
      otherPeg = 3 - targetPeg - currentPeg
      moveDisks(diskPositions, badDisk + 1, otherPeg)
      print disk[badDisk].to_s + "-", pegs[targetPeg].to_s
      diskPositions[badDisk] = targetPeg
      moveDisks(diskPositions, badDisk + 1, targetPeg)
      break
    end
  end
end

moveDisks(disk_positions.reverse, 0, 2)

PS：configuration.txt是一个包含以下行的文本文件：

A-1
B-4:2
C-3

Answer 1

在Python中，内置的word start stop speaker speaker_2 speaker_1 0 but that's alright 2.72 3.47 2 but that's alright 1 we'll have to 8.43 9.07 1 we'll have to 2 okay sure 9.19 11.01 2 okay sure 3 what? 11.02 12.00 1 what? 4 I agree 12.01 14.00 2 I agree 5 but i disagree 14.01 17.00 2 but i disagree 6 thats fine 17.01 19.00 1 thats fine 7 however you are 19.01 22.00 1 however you are 8 like this 22.01 24.00 1 like this 9 and 24.01 25.00 1 and函数不包含在内，因此不会返回最后一个数字。 Ruby不使用 function ，它有几个 operators -两点形式range创建一个范围，包括最后一个数字，三个点号..，不包括高值。有关更多信息，请参见documentation。

您发布的代码还有一些其他错误，并且不是很惯用，但是您的错误是由使用包含形式引起的，当索引超出范围时，这将导致返回nil值。范围...与Python函数等效。

将简单代码从python转换为ruby

1 个答案: