老师您好！请问我直接运行我代码，然后在text框里写入一些文本内容后直接点击保存时会报一个错：TypeError: expected str, bytes or os.PathLike object, not NoneType，于是我在保存里加了个判断self.filename是否为空，空的话给它一个保存路径，再运行时才能直接保存：
self.filename = 'F:/Python_pycharm/turtleproject/未命名.txt'
有没有方法能点击直接保存时使他自己选择路径，再进行保存。
代码：
from tkinter import *
from tkinter.colorchooser import *
from tkinter.filedialog import *
class Application(Frame):
def __init__(self, master=None):
super().__init__(master)
self.master = master
self.filename = None
self.txt1 = None
self.pack()
self.createWidget()
def createWidget(self):
menubar = Menu(root)
menuFile = Menu(menubar)
menuEdit = Menu(menubar)
menuHelp = Menu(menubar)
menubar.add_cascade(label="文件(F)", menu=menuFile)
menubar.add_cascade(label="编辑(E)", menu=menuEdit)
menubar.add_cascade(label="帮助(H)", menu=menuHelp)
menuFile.add_command(label="新建", accelerator="ctrl+n", command=self.newCreateFile)
menuFile.add_command(label="打开", accelerator="ctrl+o", command=self.openFile)
menuFile.add_command(label="保存", accelerator="ctrl+s", command=self.saveFile)
menuEdit.add_command(label="选择背景色", command=self.optionColor)
root["menu"] = menubar
self.txt1 = Text(root, width=400, height=300, bg='white')
self.txt1.pack()
def newCreateFile(self):
# 新建文本文档
self.txt1.delete('1.0', 'end')
self.filename = asksaveasfilename(title="另存为", initialfile="未命名.txt",
filetypes=[("文本文档", "*.txt")], defaultextension=".txt")
print(self.filename)
self.saveFile()
def openFile(self):
# 打开文件
self.txt1.delete('1.0', 'end')
with askopenfile(title='打开文本文件') as f:
self.txt1.insert(INSERT, f.read())
self.filename = f.name
root.title(self.filename)
print(f.name)
def saveFile(self):
# 保存文件
if self.filename is not None:
with open(self.filename, "w") as f:
c = self.txt1.get(1.0, END)
f.write(c)
else:
self.filename = 'F:/Python_pycharm/turtleproject/未命名.txt'
c = self.txt1.get(1.0, END)
with open(self.filename, "w") as f:
f.write(c)
def optionColor(self):
# 选择背景色
color = askcolor(color='white', title='选择背景色')
self.txt1.config(bg=color[1])
if __name__ == '__main__':
root = Tk()
root.title('新建文本文档.txt 新版记事本')
root.geometry('800x600+200+100')
app = Application(master=root)
root.mainloop()
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