类型错误：gassens() 缺少 1 个必需的位置参数：'self'

Question

this code get the gas sensor from esp8266 (using "RequestHandler_httpd(BaseHTTPRequestHandler)") I want it to show on the key when it receives the gas sensor(on "class HelloWorld -> def gassens") but get this error: File "panel2.py", line 124, in do_GET HelloWorld.gassens() TypeError: gassens() missing 1 required positional argument: 'self'

i'm beginner in python please help tnx

from tkinter import *
from tkinter.ttk import *
import requests
from http.server import BaseHTTPRequestHandler, HTTPServer
from multiprocessing import Process
import time

gas = 0
hum = ''
g = 0
TheRequest = None
roomp=''
lump = 0
class HelloWorld:
    global lump
    global gas
    def __init__(self, master):
      frame = Frame(master)
      frame.pack()

      frame.columnconfigure(     0, pad    = 2)
      frame.columnconfigure(     1, pad    = 2)
      frame.rowconfigure(        0, pad    = 2)
      frame.rowconfigure(        1, pad    = 2)
      frame.rowconfigure(        2, pad    = 2)


      self.button = Button(
            frame, text="Hello", command=self.button_pressed
            )
      #self.button.pack(side=LEFT, padx=5)
      self.button.grid(row=0, column=0, pady=10, padx=10, sticky=W+E+N+S)

      self.label = Label(frame, text="this is label")
      #self.label.pack()
      self.label.grid(row=0, column=1)

       buttonStyle = Style()
      buttonStyle.configure(  "Normal.TButton",
                            background        = "#91C497",
                            borderwidth       = 1,
                            activeforeground  = "#30903C",
                            compound          = "BOTTOM")
      buttonStyle.configure(  "Selected.TButton",
                            background        = "#107B1D",
                            borderwidth       = 1,
                            activeforeground  = "#30903C",
                            compound          = "BOTTOM")

      self.fanImage = PhotoImage(file="icons/ac.png")
      self.addImage = PhotoImage(file="icons/add.png")
      self.extractor_button = Button(   frame,
                                      text      = "Extractor",
                                      command   = self.toggleFan,
                                      image     = self.fanImage,
                                      style     = "Normal.TButton")
      #self.extractor_button.pack()
      self.extractor_button.grid(row=1, column=1)

      self.label2 = Label(frame, text="gas-sensor is here")
      self.label2.grid(row=2, column=0, columnspan  = 2)


    def button_pressed(self):
      TheRequest = requests.get('http://192.168.43.91/off')


     def toggleFan(self):
      global lump
      if lump == 0 :
        TheRequest = requests.get('http://192.168.43.91/on')
        self.extractor_button.config(image=self.fanImage,style="Selected.TButton")
        lump = 1
      else :
        TheRequest = requests.get('http://192.168.43.91/off')
        self.extractor_button.config(image=self.fanImage,style="Normal.TButton")
        lump = 0

#PROBLEM HERE    
    def gassens(self):
      global gas  
      self.label2.config(text=gas)
    

class RequestHandler_httpd(BaseHTTPRequestHandler):
  def do_GET(self):
    global gas
    global hum
    global g
    print('you got this massage')
    print("request ::",self.requestline)

    req = self.requestline
    tstgas = req.find ("gas")
    tsthum = req.find ("hum")
    if tstgas == 5 :
        gas = str()
        gas = req.replace("GET /gas", "")
        gas = gas.replace(" HTTP/1.1", "")
        print("gaz :"+gas)
        gas = int(gas)
#PROBLEM HERE
        HelloWorld.gassens()
    
    messagetosend = bytes('this is from pi',"utf")
    self.send_response(200)
    self.send_header('Content-Type', 'text/plain')
    self.send_header('Content-Length', len(messagetosend))
    self.end_headers()
    self.wfile.write(messagetosend)
    return
def server_rp():
  global gas
  global g
  try:

      server_address_httpd = ('192.168.43.211',8080)
      httpd = HTTPServer(server_address_httpd, RequestHandler_httpd)
      print('server is started!')
      httpd.serve_forever()
  except:
      print("khata dar server")

def main():
  root = Tk()
  root.geometry("250x150+300+300")
  ex = HelloWorld(root)
  root.mainloop()

if __name__ == '__main__':
  p1 = Process(target=main)
  p1.start()
  p2 = Process(target=server_rp)
  p2.start()
  p1.join()
  p2.join()

Answer 1

This is not the way you call a method in Python. If it was Java and gassens was static, you could do this. However, there's no concept of static variables in Python.

HelloWorld.gassens()

Instead, you want to create an instance of the class to use the function gassens. For example:

gas = HelloWorld(masterParam)
gas.gassens()

Answer 2

You cannot access tkinter widgets in another process directly. So use threading.Thread instead of multiprocessing.Process on the HTTP server part and run the tkinter GUI in the main thread.

Below is suggested changes based on your code:

from threading import Thread
...
class HelloWorld:
    ...
    def gassens(self, gas):
        self.label2.config(text=gas)

class RequestHandler_httpd(BaseHTTPRequestHandler):
    def do_GET(self):
        # send back response
        messagetosend = b'this is from pi'
        self.send_response(200)
        self.send_header('Content-Type', 'text/plain')
        self.send_header('Content-Length', len(messagetosend))
        self.end_headers()
        self.wfile.write(messagetosend)

        req = self.requestline
        tstgas = req.find('gas')
        if tstgas == 5:
            # requestline: GET /gasXXX HTTP/1.1
            gas = req.split()[1][4:]
            print('gaz:', gas)
            ex.gassens(gas)
...
if __name__ == '__main__':
    # run tkinter GUI in main thread
    root = tk.Tk()
    root.geometry('250x150+300+300')
    ex = HelloWorld(root)
    # using thread instead of process
    Thread(target=server_rp, daemon=True).start()
    root.mainloop()