Tkinter 滑块回调时出错 "takes 1 positional argument but 2 were given"

Question

我正在尝试使用 Tkinter 滑块和按钮来调整变量。不知何故，当我移动滑块时，它会在下面给出此错误消息。我对每个回调函数都有自我。所以，这不可能。

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\aksk1\AppData\Local\Programs\Python\Python39\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
TypeError: X_voltage_adjust() takes 1 positional argument but 2 were given

我不知道为什么会这样。我尽了我所能。这是这里的代码。提前谢谢你。

class GalvoControlFrame(ttk.Labelframe):
    def __init__(self, parent):
        ttk.Labelframe.__init__(self, parent, text="Galvo Control")
        self.parent = parent
        self.master = parent.parent.master
        self.ao_found = self.master.ao_found
        # self.master.board_num

        ############ Voltage X ############
        Label(self, text="Galvo X").grid(row=0, column=1, columnspan=2)

        self.sliderX = Scale(self, orient=HORIZONTAL,
                    sliderlength=10, 
                    resolution=0.0001,
                    length=300,
                    from_=ULRange.BIP5VOLTS.range_min,
                    to=ULRange.BIP5VOLTS.range_max,
                    command=self.X_voltage_adjust)
        self.sliderX.grid(row = 1, column=1, columnspan=2)

        self.dec_button = Button(self, text="<---Decrease",
                                command=lambda:self.decrease_voltage(0))
        self.dec_button.grid(row=2, column=1)

        self.inc_button = Button(self, text="Increase--->", 
                                command=lambda:self.increase_voltage(0))
        self.inc_button.grid(row=2, column=2)

        ############ Voltage Y ############
        Label(self, text="Galvo Y").grid(row=3, column=1, columnspan=2)

        self.sliderY = Scale(self, orient=HORIZONTAL,
                    sliderlength=10, 
                    resolution=0.0001,
                    length=300,
                    from_=ULRange.BIP5VOLTS.range_min,
                    to=ULRange.BIP5VOLTS.range_max,
                    command=self.Y_voltage_adjust)
        self.sliderY.grid(row = 4, column=1, columnspan=2)

        self.dec_button = Button(self, text="<---Decrease", 
                                command=lambda:self.decrease_voltage(1))
        self.dec_button.grid(row=5, column=1)

        self.inc_button = Button(self, text="Increase--->", 
                                command=lambda:self.increase_voltage(1))
        self.inc_button.grid(row=5, column=2)

        VALUE_OPTIONS = [
            1,
            0.1,
            0.01,
            0.001,
            0.0001
        ]

        self.value_option = DoubleVar(self)
        self.value_option.set(0.0)
        options = OptionMenu(self, self.value_option, *VALUE_OPTIONS)
        options.config(width=20)
        options.grid(row=2, column=3, columnspan=2)

    def X_voltage_adjust(self):
        print(self.sliderX.get())
        if self.ao_found:
            dc.DAQ_AO_channel(self.master.DAQ_board_num, 0, self.sliderX.get() / 2.0)

    def Y_voltage_adjust(self):
        print(self.sliderY.get())
        if self.ao_found:
            dc.DAQ_AO_channel(self.master.DAQ_board_num, 1, self.sliderY.get() / 2.0)

    def decrease_voltage(self, number):
        if number == 0:
            new_val = self.sliderX.get() - self.value_option.get()
            if new_val < ULRange.BIP5VOLTS.range_min:
                new_val = ULRange.BIP5VOLTS.range_min
            self.sliderX.set(new_val)
            # if self.ao_found:
            #     dc.DAQ_AO_channel(self.master.DAQ_board_num, 0, self.sliderX.get() / 2.0)
        elif number == 1:
            new_val = self.sliderY.get() - self.value_option.get()
            if new_val < ULRange.BIP5VOLTS.range_min:
                new_val = ULRange.BIP5VOLTS.range_min
            self.sliderY.set(new_val)
            # if self.ao_found:
            #     dc.DAQ_AO_channel(self.master.DAQ_board_num, 1, self.sliderY.get() / 2.0)

    def increase_voltage(self, number):
        if number == 0:
            new_val = self.sliderX.get() + self.value_option.get()
            if new_val < ULRange.BIP5VOLTS.range_min:
                new_val = ULRange.BIP5VOLTS.range_min
            self.sliderX.set(new_val)
            # if self.ao_found:
            #     dc.DAQ_AO_channel(self.master.DAQ_board_num, 0, self.sliderX.get() / 2.0)
        else:
            new_val = self.sliderY.get() + self.value_option.get()
            if new_val < ULRange.BIP5VOLTS.range_min:
                new_val = ULRange.BIP5VOLTS.range_min
            self.sliderY.set(new_val)
            # if self.ao_found:
            #     dc.DAQ_AO_channel(self.master.DAQ_board_num, 1, self.sliderY.get() / 2.0)
    ```

Answer 1

一个 tkinter Scale 可以 return 它的当前值到在“命令”kwarg 中调用的函数。这是 python 感到困惑的第二个论点。您可以像这样将它添加到您的函数中：例如 def X_voltage_adjust(self, value):。

此行为的一个简单示例：

from tkinter import Tk, DoubleVar, Scale, CENTER, Label
    
def sel(a):
    print(a)
    selection = "Value = " + str(var.get())
    label.config(text=selection)
    
root = Tk()
var = DoubleVar()
scale = Scale(root, variable=var, command=sel)
scale.pack(anchor=CENTER)

label = Label(root)
label.pack()

root.mainloop()

Tkinter 滑块回调时出错 "takes 1 positional argument but 2 were given"

Error "takes 1 positional argument but 2 were given" when Tkinter slider callback

python

tkinter