将新行添加到文件

Question

I am wondering how to append a newline every time the list reaches the size of the checker board (8). Heres my code so far. It works but I want to put a newline every 8 characters.

 saveFile=input("Please enter the name of the file you want to save in: ")
  outputFile=open(saveFile,"w")
  pieceList=[]
  for row_index in range (self.SIZE):
     for column_index in range(self.SIZE):
        pieceRow=[]
        char=" "
        if self.grid[row_index][column_index]==Piece(Piece.WHITE):
           char="w"
        elif self.grid[row_index][column_index]==Piece(Piece.RED):
           char="r"
        pieceRow.append(char)
     pieceList.append(pieceRow)
     for item in pieceList:
        for char in item:
           outputFile.write("%s" %char)

Answer 1

Use

if row_index % 8 == 0:
    # put newline

Answer 2

saveFile=input("Please enter the name of the file you want to save in: ")
  outputFile=open(saveFile,"w")
  pieceList=[]
  characterCounter =0
  for row_index in range (self.SIZE):
     for column_index in range(self.SIZE):
        pieceRow=[]
        char=" "
        if self.grid[row_index][column_index]==Piece(Piece.WHITE):
           char="w"
        elif self.grid[row_index][column_index]==Piece(Piece.RED):
           char="r"
        pieceRow.append(char)
        characterCounter++
        if characterCounter==8:
           pieceRow.append("\n")
           characterCounter=0
     pieceList.append(pieceRow)
     for item in pieceList:
        for char in item:
           outputFile.write("%s" %char)

Answer 3

cnt = 0 
for item in pieceList:
    for char in item:
       outputFile.write("%s" %char)
       cnt += 1
       if cnt == 8:
           outputFile.write("\n")
           cnt = 0

Answer 4

Do you mean you want to append newline after each row? Why not add

pieceRow.append("\n")

before

pieceList.append(pieceRow)

Answer 5

You could use enumerate,

For instance, CONST_SIZE = 8

for index, item in enumerate(item_list):
    output_file.write(item)
    if index % 8 == 0: output_file.write('\n')

This will append a newline each time you've written 8 items to the file.