Question

嘿，这是我在这里的第二篇文章，我只是陌生人，而我在Uni学习。这是我的第一个问题，即“自动从字典中调用密钥”。

所以我最初在同一个for循环中设置了这个，但是，我得到了错误

The error was:__setitem__
Attribute not found.
You are trying to access a part of the object that doesn't exist.

我对dict和键有错误的想法吗？我认为如果pictureCount = 3，它将通过for语句3次并创建picture [1]，picture [2]和picture [3]变量。它似乎正在经历第一个循环，但一旦它到达图片[2]，就会发生错误。我的想法是，没有图片[2]一遍又一遍地创建了它的唯一图片[1]。如果您需要更多代码，请告诉我们。

      for p in range(1,pictureCount+1):
        picture[p]=makePicture(pickAFile())

      for p in range(1,pictureCount+1):
        width[p]=getWidth(picture[p])
         height[p]=getHeight(picture[p])
         totalWidth=totalWidth+width[p]
         height=getHeight(picture[p])
         if height > totalHeight:
           totalHeight=height

好的，这是完整的代码。

    def comicStrip():
      picture={}
      width={}
      height={}
      totalWidth=0
      totalHeight=0
      pixelCount=0
      loopCounter=0
      pictureCount=requestInteger("How many pictures do you want in the comic strip?(1-4)")
      while pictureCount <1 or pictureCount >4:     
        pictureCount=requestInteger("How many pictures do you want in the comic strip?(1-4)")

      for p in range(1,pictureCount+1):
        picture[p]=makePicture(pickAFile())

      for p in range(1,pictureCount+1):
        width[p]=getWidth(picture[p])
        height[p]=getHeight(picture[p])
        totalWidth=totalWidth+width[p]
        height=getHeight(picture[p])
        if height > totalHeight:
          totalHeight=height
      cStrip=makeEmptyPicture(totalWidth, totalHeight)
      pixelCount=0

      while loopCounter < pictureCount:
        sourceX=0
        for targetX in range(pixelCount,width[p]):
          sourceY=0
          for targetY in range(0,height[p]):
            color = getColor(getPixel(picture[1],sourceX,sourceY))
            setColor(getPixel(cStrip,targetX,targetY),color)
            sourceY=sourceY+1
            pixelCount=pixelCount+1
          sourceX=sourceX+1
        addRectFilled(cStrip,0,0,p1Width,20,white)
        addRect(cStrip,0,0,p1Width,20)
        addRect(cStrip,0,0,p1Width,p1Height)
        caption=requestString("Enter the caption for this picture.") 
        addText(cStrip,1,19,str(caption))
        loopCounter=loopCounter+1

我很确定间距是正确的，我必须在复制和粘贴后重新调整。

Answer 1

代码中的错误不在线

height[p]=getHeight(picture[p])

在

处有2行

height=getHeight(picture[p])

此行应替换为以下

totalHeight = getHeight(picture[p]).

我不是python专家，但似乎解释器在for循环的第一次迭代之后将高度从数组（或dict）变为正常变量。在第二个迭代行height[p]=getHeight(picture[p])尝试访问元素p但不再存在。

我尝试了以下代码JES并得到了同样的错误

array1 ={}
array1[1] = 5
array1 = 7
array1[1] = 8

print array1[1]

键似乎在for循环中没有“计数”

1 个答案: