Question

I am trying to write a very simple script that would simulate a pocket secretary for my homework, but I have a small issue. I want all my data to be saved in a file (abstract form) each time I exit the program and then when i boot it up I want to read that file, eval(stack) (basically load the data into memory) then verify if it s valid ... anything that isn t is deleted. This is what I ve done:

    def loadToString (stack):
        f = open ("data.txt", "w")
        load_stack = str(stack)  #convert to string
        f.write (load_stack)  #write in file
        f.close() 

    def loadFromString ():
       f = open ("data.txt", "r")
       load_stack = f.readline() #read string
       if (load_stack == "" or load_stack == " " or load_stack == None): 
           stack = []
           return stack 
      else:
          stack = eval(load_stack) #trying to convert from string to list
      f.close ()

我的问题是,在我看一看档案时,它不是真的说谎,因为它缺乏trop子;“和”;因此,当我试图“老(打)”一些错误,我的“历史”最终变成空洞时(当我试图用空洞的 st——None-时)

我无法理解为什么发生这种情况。另外,I m ok有快速固定装置(在txt档案中人工添加外线)

I have no idea how to check if a file is empty or if I read an empty line so I d also appreciate if you could help me with the "if" statement in "loadFromString". About eval () ... like I said this is just homework so I m not afraid about any malicious intents.

Answer 1

为处理你眼前的问题,将<代码>上载_stack = str(stack)改为load_stack = repr(stack)。这将增加热带。

之后,您不妨查看csv模块或shelve模块。两者都易于使用,并将考虑到许多低层次的细节。

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