Question

好吧所以我正在尝试编写一个脚本，它接受两个文件并在将其写入目标之前修改第一个文件，但每当我运行它时，脚本只会一遍又一遍地打印第一个修改过的行。

#3a
def modify(string):
    """Takes a string and returns a modified version of the string using two modifications. One must be a replacement of some kind.

    string -> string"""
    while string != "":
        string = string.upper()
        string = string.replace("A","4").replace("B","8").replace("C","<").replace("E","3").replace("G","6").replace("I","1").replace("O","0").replace("R","|2").replace("S","5").replace("T","7").replace("Z","2")
        print(string)

#3b - asks the user to type in a source code filename and destination filename; opens the files; loops through the contents of the source file line-by-line, using modify() to modify eat line before writing it to the destination file; the closes both files.
source = input("What file would you like to use?")
destination = input("Where would you like it to go?")
filesource = ""

while filesource == "":
    try:
        file_source = open(source, "r")
        file_destination = open(destination, "w")
        for item in file_source:
            mod = modify(item)
            file_destination.write(mod)
        file_source.close()
        file_destination.close()
        break
    except IOError:
        source = input("I'm sorry, something went wrong. Give me the source file again please?")

任何帮助？

Answer 1

提示：如果你运行modify("TEST ME")它会返回什么？

将return string添加到modify函数的末尾。

Answer 2

字符串永远不会清空 - 尝试使用索引int解析char by char，条件为while i < len(string)

打开文件时无限循环

2 个答案: