Question

我正在使用Tkinter为Raspberry Pi制作一个简单的GUI。当我尝试运行它时，我收到以下错误：

    self.rpm_status1.config(text=rpm_value)
AttributeError: 'Application' object has no attribute 'rpm_status1'

我很确定问题在于某处的格式化，但我对Python不熟悉以找到问题。如果创建“应用程序”类最适合此类应用程序，请告诉我，而不是其他约定。这是我的代码：

try:
    from Tkinter import *
except ImportError:
    from tkinter import *
try:
    import tkinter.messagebox
except ImportError:
        import tkMessageBox
import smbus

bus = smbus.SMBus(1)
addr = 0x45

rpm_value = 123

cmd_null = 0
cmd_pwm_on_off = 1
cmd_pwm_select = 2
cmd_pwm_dc = 3
cmd_pwm_period = 4
cmd_rpm_on_off = 5
cmd_rpm_data_prep = 6
cmd_measure = 79
cmd_measure_data_prep = 8
cmd_buzzer_on_off = 9
cmd_batt_data_prep = 10

class Application:
    def __init__(self, master):
        self.master = master #IDK what this does

        #***PWM***

        pwm_chkbtn = Checkbutton(root, text="PWM on")
        freq_label = Label(root, text="Frequency (Hz):")
        freq_entry = Entry(root)
        dc_label = Label(root, text="Duty Cycle (%):")
        dc_scale = Scale(root, from_=0, to=100, resolution=5, orient=HORIZONTAL)

        pwm_chkbtn.grid(columnspan=2)
        freq_label.grid(row=1, sticky=E)
        freq_entry.grid(row=1, column=1)
        dc_label.grid(row=2, sticky=E)
        dc_scale.grid(row=2, column=1)

        #***RPM***

        self.rpm_onoff = IntVar()
        rpm_chkbtn = Checkbutton(
            root, text="Take RPM", variable=self.rpm_onoff)
        rpm_chkbtn.grid(row=3)
        rpm_status1 = Label(
            root, text="%d RPM", bd=1, relief=SUNKEN)
        rpm_status2 = Label(
            root, text="%d Hz", bd=1, relief=SUNKEN)
        rpm_status1.grid(row=3,column=1, sticky=W, padx=4)
        rpm_status2.grid(row=3,column=1)
        self.rpm_poll() #start polling



        #***resistance***
        def take_meas():
            bus.write_byte(addr, cmd_measure)

        meas_btn = Button(root, text="Take resistance\nmeasurement", command=take_meas)
        meas_label = Label(root, text="%d mOhm", bd=1, relief=SUNKEN)

        meas_btn.grid(row=4)
        meas_label.grid(row=4, column=1, sticky=W, padx=4)

#RPM functions
    def rpm_poll (self):
        if self.rpm_onoff:
            global rpm_value
            self.rpm_status1.config(text=rpm_value)
        self.master.after(1000, self.poll)





#**main loop**
root = Tk()
root.title("EMC Lab")
app = Application(root)
root.mainloop()
#***end main***

Answer 1

您没有让类中的其他函数访问rpmstatus1，因为您没有使用self。以下是更正后的代码，应该用于您计划在其他功能中使用的每个小部件：

self.rpm_status1 = Label(
        root, text="%d RPM", bd=1, relief=SUNKEN)

这确保了小部件在整个班级中都可用。

Tkinter GUI错误，'对象没有属性'，试验和格式化失败

1 个答案: