Python 创建保存按钮，将编辑后的版本保存到同一文件(不是另存为)

Question

这是我目前正在编写的一个简单的记事本程序。大多数事情都在工作，但无法让保存工作。我在定义保存的地方不知道如何创建保存功能(不是另存为)。

不是完整的代码

from tkinter import *
from tkinter.messagebox import *
from tkinter.filedialog import *
from tkinter.font import *
import sys, time, sched, math

class Format:
    def __init__(self, notepad):
        print("Font")

class ZPad:
    def __init__(self):
        self.root = Tk()
        self.root.title("ZPad")
        self.root.wm_iconbitmap('Notepad.ico')

        self.scrollbar = Scrollbar(self.root)
        self.scrollbar.pack(side=RIGHT, fill=Y)

        self.textbox = Text(self.root, yscrollcommand=self.scrollbar.set, undo=TRUE)
        self.textbox.pack(side=LEFT, fill=BOTH, expand=YES)

        #Menu Bar
        self.menubar = Menu(self.root)
        self.filemenu = Menu(self.menubar, tearoff=0)
        self.filemenu.add_command(label="New", command=self.New, accelerator="Ctrl+N")
        self.filemenu.add_command(label="Open...", command=self.open, accelerator="Ctrl+O")
        self.filemenu.add_command(label="Save", command=self.Save, accelerator="Ctrl+S")
        self.filemenu.add_command(label="Save as...", command=self.Save_as, accelerator="Ctrl+Shift+S")
        self.filemenu.add_separator()
        self.filemenu.add_command(label="Exit", command=self.quit, accelerator="Ctrl+Q")
        self.menubar.add_cascade(label="File", menu=self.filemenu)

        self.editmenu = Menu(self.menubar, tearoff=0)
        self.editmenu.add_command(label="Undo", command=self.Undo, accelerator="Ctrl+Z")
        self.editmenu.add_command(label="Redo", command=self.Redo, accelerator="Ctrl+Y")
        self.editmenu.add_separator()
        self.editmenu.add_command(label="Cut", command=self.Cut, accelerator="Ctrl+X")
        self.editmenu.add_command(label="Copy", command=self.Copy, accelerator="Ctrl+C")
        self.editmenu.add_command(label="Paste", command=self.Paste, accelerator="Ctrl+P")
        self.editmenu.add_command(label="Clear All", command=self.Clear_All, accelerator="Ctrl+Shift+A")
        self.editmenu.add_separator()
        self.editmenu.add_command(label="Format", command=self.options, accelerator="Ctrl+T")
        self.menubar.add_cascade(label="Edit", menu=self.editmenu)

        self.helpmenu = Menu(self.menubar, tearoff=0)
        self.helpmenu.add_command(label="About...", command=self.About)
        self.menubar.add_cascade(label="Help", menu=self.helpmenu)


        self.root.config(menu=self.menubar)

        self.root.mainloop()

def Save(self):
    print("Save")

def Save_as(self):
    global file
    file = tkinter.filedialog.asksaveasfile(mode='w', defaultextension=".z", filetypes = ( ("ztext file", "*.z"),("zytext", "*.zy") ) )
    if file is None:
        return
    else:
        print(file)
    textoutput = self.textbox.get(0.0, END)
    file.write(textoutput.rstrip())
    file.write("\n")

notepad = ZPad()

我在 Windows 8.1 中使用 python 3.4。谢谢。

Answer 1

这是一个保存和另存为函数的简单示例，带有注释:

def save(self):
    contents = self.textbox.get(1.0,"end-1c") #store the contents of the text widget in a str
    try:                                       #this try/except block checks to
        with open(self.f, 'w') as outputFile:  #see if the str containing the output
            outputFile.write(contents)         #file (self.f) exists, and we can write to it,
    except AttributeError:                     #and if it doesn't,
        self.save_as()                         #call save_as

def save_as(self):
    contents = self.textbox.get(1.0,"end-1c")
    self.f = tkFileDialog.asksaveasfilename(   #this will make the file path a string
        defaultextension=".z",                 #so it's easier to check if it exists
        filetypes = (("ztext file", "*.z"),    #in the save function
                     ("zytext", "*.zy")))
    with open(self.f, 'w') as outputFile:
        outputFile.write(contents)

还有其他方法可以做到这一点，但这会在紧要关头起作用。想想 save 函数需要什么:要保存的文本和要保存的文件，然后从那里开始。