我正在制作一个Tkinter文本编辑器,我在课上遇到了一些麻烦。我已经创建了一个包含所有函数的类和一个包含mainloop的类。根窗口打开很好但按下保存按钮时出现错误
Exception in Tkinter callback
Traceback (most recent call last):
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 1536, in __call__
return self.func(*args)
TypeError: unbound method saveas() must be called with F instance as first argument (got nothing instead)
我看过这个和这个例子,但无法弄清楚出了什么问题。 我的问题是什么?
以下是我的简短代码,说明了问题。
from Tkinter import *
class Main(object):
def __init__(self, root):
root.title("PyText")
self.m1=Menu(root)
self.fm=Menu(self.m1, tearoff=0)
self.fm.add_command(label="New", command=self.saveas())
self.fm.add_command(label="Open", command=self.saveas())
self.fm.add_command(label="Save", command=self.saveas())
self.fm.add_command(label="Save as...", command=self.saveas())
self.fm.add_command(label="Close", command=self.saveas())
self.fm.add_separator()
self.fm.add_command(label="Exit", command=root.quit)
self.m1.add_cascade(label="File", menu=self.fm)
self.editmenu = Menu(self.m1, tearoff=0)
self.editmenu.add_command(label="Undo", command=self.saveas())
self.editmenu.add_separator()
self.editmenu.add_command(label="Cut", command=self.saveas())
self.editmenu.add_command(label="Copy", command=self.saveas())
self.editmenu.add_command(label="Paste", command=self.saveas())
self.editmenu.add_command(label="Delete", command=self.saveas())
self.editmenu.add_command(label="Select All", command=self.saveas())
self.m1.add_cascade(label="Edit", menu=self.editmenu)
self.helpmenu = Menu(self.m1, tearoff=0)
self.helpmenu.add_command(label="Help Index", command=self.saveas())
self.helpmenu.add_command(label="About...", command=self.saveas())
self.m1.add_cascade(label="Help", menu=self.helpmenu)
root.config(menu=self.m1)
self.t1=Text(root)
self.t1.config(width=90, height=40)
self.t1.grid()
def saveas(self):
self.filewin = Toplevel()
self.e1=Entry(self.filewin)
self.e1.grid()
self.button = Button(self.filewin, text="Save", command=self.save)
self.button.grid()
def save(self):
with open(self.e1.get(), "w") as f: # this instance variable can be accessed
f.write(self.t1.get('1.0', 'end')) # added self.t1 above, and start/end
root = Tk()
app = Main(root)
root.mainloop()
答案 0 :(得分:2)
您正在构建错误的应用程序。从该类中获取根Tkinter对象构建代码。你需要一个包含Tkinter对象的东西的类。如果你想要更多类用于其他类型的对象,那很好。实际上,你将F.saveas
作为一个没有参数的类方法调用,它期待self
,这是类F
的一个实例,你没有它,因为你从来没有实例化过。
from Tkinter import *
class Main(object):
def __init__(self, root):
# root.geometry("100x100") # this will make your app window tiny -
# I've commented it out for now but you'll need to look into it
self.b1 = Button(root, text="save", command=self.saveas)
self.b1.grid()
self.t1 = Text(root) # added a Text widget
self.t1.grid()
def saveas(self):
filewin = Toplevel()
self.e1=Entry(filewin) # make this an instance variable
self.e1.grid()
button = Button(filewin, text="Save", command=self.save)
button.grid()
def save(self):
with open(self.e1.get(), "w") as f: # this instance variable can be accessed
f.write(self.t1.get('1.0', 'end')) # added self.t1 above, and start/end
master = Tk()
app = Main(master)
root.mainloop()