python - 如何在类的递归方法中使用参数
问题描述
我正在尝试准备一个 tkinter 帧以显示不同传感器的一些值。我会使用 Class 对象来重用代码，放置每个传感器的特定参数。以下是我的部分代码：
代码有效，我得到一个标签，其值在常规基础上更新，但我只会创建类 LabelScreen 的实例，其中包含作为参数传递的不同文本和值。
class LabelScreen1():
def __init__(self, parent, text_label, string_var):
self.string_var = string_var
larghezza_titolo = 19
larghezza_labels = 5
altezza_labels = 2
imb_pulsantey = int(1*h)
imb_pulsantex = int(1.5*w)
self.labelA = tk.Label(
labels_frame,
text = "fff",
width = larghezza_labels,
height = altezza_labels,
highlightthickness=2,
highlightcolor="DodgerBlue2",
highlightbackground='DodgerBlue2',
font= ('ObliviousFont',int(h*5)),
fg="DodgerBlue2",
background = "gray3",
pady = imb_pulsantey,
padx = imb_pulsantex
)
self.labelA.place(x=int(w*10), y=int(h*10))
self.labelA_title = tk.Label(
labels_frame,
text = text_label,
width = larghezza_titolo,
font= ('ObliviousFont',int(h*1.5)),
fg="DodgerBlue2",
background = "gray3",
)
self.labelA_title.place(in_=self.labelA, relx=.5, y=int(h*2),anchor="c")
self.update_label()
def update_label(self):
self.labelA.configure(text=self.string_var.get())#prex_hot)
self.labelA.after(1000, self.update_label)
class LabelScreen2():
def __init__(self, parent, text_label):
larghezza_titolo = 19
larghezza_labels = 5
altezza_labels = 2
imb_pulsantey = int(1*h)
imb_pulsantex = int(1.5*w)
self.labelA = tk.Label(
labels_frame,
text = "fff",
width = larghezza_labels,
height = altezza_labels,
highlightthickness=2,
highlightcolor="DodgerBlue2",
highlightbackground='DodgerBlue2',
font= ('ObliviousFont',int(h*5)),
fg="DodgerBlue2",
background = "gray3",
pady = imb_pulsantey,
padx = imb_pulsantex
)
self.labelA.place(x=int(w*30), y=int(h*10))
self.labelA_title = tk.Label(
labels_frame,
text = text_label,
width = larghezza_titolo,
font= ('ObliviousFont',int(h*1.5)),
fg="DodgerBlue2",
background = "gray3",
)
self.labelA_title.place(in_=self.labelA, relx=.5, y=int(h*2),anchor="c")
self.update_label()
def update_label(self):
self.labelA.configure(text=temp1)
self.labelA.after(1000, self.update_label)
class LabelScreen3():
def __init__(self, parent, text_label):
larghezza_titolo = 19
larghezza_labels = 5
altezza_labels = 2
imb_pulsantey = int(1*h)
imb_pulsantex = int(1.5*w)
self.labelA = tk.Label(
labels_frame,
text = "fff",
borderwidth=int(h*0.3),
width = larghezza_labels,
height = altezza_labels,
highlightthickness=2,
highlightcolor="DodgerBlue2",
highlightbackground='DodgerBlue2',
font= ('ObliviousFont',int(h*5)),
fg="DodgerBlue2",
background = "gray3",
pady = imb_pulsantey,
padx = imb_pulsantex
)
self.labelA.place(x=int(w*50), y=int(h*10))
self.labelA_title = tk.Label(
labels_frame,
text = text_label,
width = larghezza_titolo,
font= ('ObliviousFont',int(h*1.5)),
fg="DodgerBlue2",
background = "gray3",
)
self.labelA_title.place(in_=self.labelA, relx=.5, y=int(h*2),anchor="c")
self.update_label()
def update_label(self):
self.labelA.configure(text=temp2)
self.labelA.after(1000, self.update_label)
def change_value_randomly(string_var):
import time
import random
while True:
#string_var.set(random.randint(-10, 10))
string_var.set(prex_hot)
time.sleep(1)
radice = tk.Tk()
H=int(radice.winfo_screenheight())
W=int(radice.winfo_screenwidth())
h=int(H/100)
w=int(W/100)
prex_hot=tk.StringVar()
t = threading.Thread(target=change_value_randomly, args=(prex_hot,))
t.start()
screen_resolution = str(W)+'x'+str(H)
radice.geometry(screen_resolution)
labels_frame = tk.Frame(
radice, background = "black")
labels_frame.pack(fill=tk.BOTH, expand=True)
#labels_frame.pack_propagate(0)
#radice.overrideredirect(1)
label1 = LabelScreen1(radice, "PRESSURE HOT WATER", prex_hot)
label2 = LabelScreen2(radice, "TEMP. EXTERNAL NH")
label3 = LabelScreen3(radice, "TEMP. BOILER")
radice.mainloop()
问题在于我用来更新屏幕上的文本（传感器的值）的方法 update_label(self)。在此方法中，您会看到我将作为类参数放入的变量 prex_hot。我尝试过： def update_label(self, parameter) 但由于它是递归的，我得到递归错误。我会将参数传递给类对象，但我尝试了不同的方法，但从未奏效。可能原因是由于参数本身是一个变量，或者我可能在其他地方错了。任何帮助（请原谅我的初学者错误）？
解决方案
此示例使用StringVar.
Thread运行string_var.set(value)用于设置随机值的代码StringVar。
同时LabelScreen用于string_var.get()从中获取值StringVar并将其显示在标签中。
import tkinter as tk
import threading
class LabelScreen():
def __init__(self, parent, text_label, string_var):
self.string_var = string_var
larghezza_titolo = 19
larghezza_labels = 5
altezza_labels = 2
imb_pulsantey = int(1*h)
imb_pulsantex = int(1.5*w)
screen_resolution = str(W)+'x'+str(H)
parent.geometry(screen_resolution)
self.labels_frame = tk.Frame(parent, background="black")
self.labels_frame.pack(fill=tk.BOTH, expand=True)
self.labels_frame.pack_propagate(0)
self.labelA = tk.Label(
self.labels_frame,
text = "fff",
borderwidth=int(h*0.3),
width = larghezza_labels,
height = altezza_labels,
relief="raised",
font= ('ObliviousFont',int(h*5)),
fg="SteelBlue1",
background = "gray7",
pady = imb_pulsantey,
padx = imb_pulsantex
)
self.labelA.place(x=int(w*10), y=int(h*10))
self.labelA_title = tk.Label(
self.labels_frame,
text = text_label,
borderwidth=int(h*0.3),
width = larghezza_titolo,
font= ('ObliviousFont',int(h*1.5)),
fg="SteelBlue1",
background = "gray7",
)
self.labelA_title.place(in_=self.labelA, relx=.5, y=int(h*2),anchor="c")
self.update_label()
def update_label(self):
self.labelA.configure(text=self.string_var.get())
self.labelA.after(1000, self.update_label)
# ---------------------------------------------------------
def change_value_randomly(string_var):
import time
import random
while True:
string_var.set(random.randint(-10, 10))
time.sleep(1)
radice = tk.Tk()
H=int(radice.winfo_screenheight())
W=int(radice.winfo_screenwidth())
h=int(H/100)
w=int(W/100)
#radice.overrideredirect(1)
prex_hot = tk.StringVar() # after creating `tk.Tk()`
# after creating `StringVar()` but before `mainloop()`
t = threading.Thread(target=change_value_randomly, args=(prex_hot,))
t.start()
label1 = LabelScreen(radice, "PRESSURE HOT WATER", prex_hot)
radice.mainloop()
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