Question

我试图通过使用if语句，for循环和列表来运行它。该列表是参数的一部分。我不知道如何编写if语句并让程序循环遍历所有不同的单词并设置它应该是如何。

newSndIdx=0;
  for i in range (8700, 12600+1):
    sampleValue=getSampleValueAt(sound, i)
    setSampleValueAt(newSnd, newSndIdx, sampleValue)
    newSndIdx +=1

  newSndIdx=newSndIdx+500
  for i in range (15700, 17600+1):
    sampleValue=getSampleValueAt(sound, i)
    setSampleValueAt(newSnd, newSndIdx, sampleValue)
    newSndIdx +=1

  newSndIdx=newSndIdx+500    
  for i in range (18750, 22350+1):
    sampleValue=getSampleValueAt(sound, i)
    setSampleValueAt(newSnd, newSndIdx, sampleValue)
    newSndIdx +=1

  newSndIdx=newSndIdx+500    
  for i in range (23700, 27250+1):
    sampleValue=getSampleValueAt(sound, i)
    setSampleValueAt(newSnd, newSndIdx, sampleValue)
    newSndIdx +=1

  newSndIdx=newSndIdx+500    
  for i in range (106950, 115300+1):
    sampleValue=getSampleValueAt(sound, i)
    setSampleValueAt(newSnd, newSndIdx, sampleValue)
    newSndIdx+=1

Answer 1

怎么样（如果需要的话）：

ranges = (
    (8700, 12600),
    (15700, 17600),
    (18750, 22350),
    (23700, 27250),
    (106950, 115300),
)

newSndIdx = 0

for start, end in ranges:
    for i in range(start, end + 1):
        sampleValue = getSampleValueAt(sound, i)
        setSampleValueAt(newSnd, newSndIdx, sampleValue)
        newSndIdx += 1
    newSndIdx += 500

Answer 2

我想我知道你在这里寻找什么。如果是这样，它很笨拙; GaretJax重新设计的方式更简单，更清晰（引导效率更高一些）。但它是可行的：

# Put the ranges in a list:
ranges = [
    (8700, 12600),
    (15700, 17600),
    (18750, 22350),
    (23700, 27250),
    (106950, 115300),
]

newSndIdx = 0

# Write a single for loop over the whole range:
for i in range(number_of_samples):
    # If the song is in any of the ranges:
    if any(r[0] <= i <= r[1] for r in ranges):
        # Do the work that's the same for each range:
        sampleValue=getSampleValueAt(sound, i)
        setSampleValueAt(newSnd, newSndIdx, sampleValue)
        newSndIdx +=1

然而，这仍然缺少你为每个范围添加500的位;要做到这一点，你需要另一个if，如：

    if any(r[0] <= i <= r[1] for r in ranges):
        if any(r[0] == i for r in ranges[1:]):
            newSndIdx += 500
        # The other stuff above

如何使用if语句和for循环运行？

2 个答案: