嵌套defs不工作

Question

我需要添加到第二个def语句才能工作？

def main(): 
    # the user has to choose a picture and then he is asked to 
    pic = makePicture(pickAFile()) 

    # the user is asked to select a color that he wants to remove from a picture 
    color = requestString("Which color would you like to remove?") 
    show(pic) 

    # whats wrong with this last part that doesn't make the modifications to the picture 
    def RemoveColor(pic, color): 
     r = red 
     g = green 
     b = blue 
     for px in getPixels(pic): 
      setRed(px, 0) 

     for px in getPixels(pic): 
      setGreen(px, 0) 

     for px in getPixels(pic): 
      setBlue(px, 0) 

    repaint(pic) 

Answer 1

这里我拿出RemoveColor功能从main功能，我把它从内main

def RemoveColor(pic, color): 
    r = red 
    g = green 
    b = blue 
    for px in getPixels(pic): 
     setRed(px, 0) 

    for px in getPixels(pic): 
     setGreen(px, 0) 

    for px in getPixels(pic): 
     setBlue(px, 0) 

def main(): 
    # the user has to choose a picture and then he is asked to 
    pic = makePicture(pickAFile()) 

    # the user is asked to select a color that he wants to remove from a picture 
    color = requestString("Which color would you like to remove?") 
    show(pic) 

    RemoveColor(pic, color) # HERE I'M CALLING RemoveColor 
    repaint(pic)