不能得到数据文件输出到从文件打印的下一行，打印第一行多次

Question

if option == 2: 
     print("These are the lines of data from the data file:") 
     datafile = open("K:/python compiler/datafile.dat","r") 
     line = datafile.readline() 
     field = line.split(",") 
     custid = field[0] 
     widgets = field[1] 
     gidgets = field[2] 
     doodads = field[3] 
     count = 0 
     while line != "": 

      count += 1 
      print("\n", count, " - Customer id:", field[0] , "\nWidgets  ordered:", field[1], "\nGidgets ordered:", field[2], "\nDoodads ordered:", field[3] , end = "") 
      line = datafile.readline(line) 
     datafile.close() 

最后while语句似乎是问题，只是不知道为什么它不会前进到下一行

Answer 1

你需要重新分配字段中的而循环。

while line != "": 
    count += 1 
    print("\n", count, " - Customer id:", field[0] , "\nWidgets  ordered:", field[1], "\nGidgets ordered:", field[2], "\nDoodads ordered:", field[3] , end = "") 
    line = datafile.readline() 
    field = line.split(",")