在Python实例化一个class到function时，如何传递arguments？

Question

I have tried to portray and document each class only what is necessary, hope you can help me please, I am trying to instantiate the class Show_image which requires two parameters, two indexes of a list of images, if you could guide me if what I am trying to do is possible I would appreciate it. Thanks.

This class resizes the image

from tkinter importante *
from PIL import Image, ImageTk

class Array(Frame):
    def __init__(self, master, path, *args):
        Frame.__init__(self, master, *args)       self.image = Image.open(path)
        self.img_copy = self.image.copy()

        self.background_image = ImageTk.PhotoImage(self.image)

        self.background = Label(self, image=self.background_image)
        self.background.pack(fill='both', expand=True)
        self.background.bind('<Configure>', self._resize_image)

    def _resize_image(self, event):
        self.image = self.img_copy .resize ((self.master .winfo_width(), self.master .winfo_height()))

        self.background_image = ImageTk.PhotoImage(self.image)
        self.background.configure(image=self.background_image)

Base class control

class Interface(Frame):
    def __init__(self, master, *args):
        Frame.__init__(self, master, *args)
        self.path_lst = ['11.png','22.png','33.png','44.png']  # change/add paths 
        self._frame_1 = None
        self._open_1 = False
        self.button1 = Button(self, text='pack 1',
                      command= lambda:self.windows(Show_image))
        self.button1 .pack()
 
    def windows(self, var_1):
        if not self._open_1:
            self.top1 = Toplevel(self.master)
            self.top1 .geometry('200x200')
                                
        container = var_1(self.top1)

        if self._frame_1 is not None:  
            self._frame_1 .destroy()
        self._frame_1 = container
        self._frame_1 .pack()
        self._open_1 = True

        self.top1.protocol ('WM_DELETE_WINDOW', lambda: self.closed(1))
    
    def closed(self, number):
        if number == 1:
            self.top1. destroy()
            self._open_1 = False

This class should draw two instances, two images, but I don't know how to pass <index_1> and <index_2> arguments in bound <lambda> function.

class Show_image(Frame):
    def __init__(self, index_1, index_2, *args, **kwargs):
        Frame.__init__(self, *args, **kwargs)
        self.img = Array(self, self.master.path_lst[index_1])
        self.img .grid(column=0, row=0)
        self.img2 = Array(self, self.master.path_lst[index_2])
        self.img2 .grid(column=0, row=1)

root = Tk()
frm = Interface(root)
frm .pack()
root.mainloop()

Also, if you could tell me if the initialization path of the images is correct. Thanks.

Answer 1

If I understant you will have to use nested lambdas

command=lambda:self.windows(lambda:Show_image(index1, index2))

but I see that windows runs function with argument top so it will need it also in lambda

command=lambda:self.windows( lambda top:Show_image(index1, index2, top))

---

EDIT:

Full working code with other changes.

I send master as first value and path_lst as last value and I don't need to use self.master.pack_lst

I changed some pack() , grid() and I added grid_rowconfigure() so it correctly resize images when window change size.

I used os.listdir() to create path_lst . It uses sys.argv to get folder from command line ( python script.py path_to_images ) or it uses os.getcwd() to get Current Working Directory as folder

I changed name to ShowImage as suggest PEP8 - CamelCaseNames for classes.

I'm not sure if it suggests to use noun for classes (like noun ImageViewer instead of verb ShowImage ) and verb for functions (like verb show_window instead of noun windows ) but I skip it. Maybe it is suggestion in book 'Clean Code' by Robert C. Martin (also known as Uncle Bob )

PEP 8 -- Style Guide for Python Code

import os   # os.path.join(), os.listdir()
import sys  # sys.argv
#from tkinter import *  # PEP8: `import *` is not preferred
import tkinter as tk 
from PIL import Image, ImageTk

# --- constants ---  # PEP8: `UPPER_CASE_NAMES

#FOLDER = '/home/furas/test'

# --- classes ---  # PEP8: `CamelCaseNames` 

class Array(tk.Frame):
    def __init__(self, master, path, *args):
        super().__init__(master, *args)   # in Python 3 you can use `super()` without `self`
        
        self.image = Image.open(path)
        self.img_copy = self.image.copy()

        self.background_image = ImageTk.PhotoImage(self.image)

        self.background = tk.Label(self, image=self.background_image)
        self.background.pack(fill='both', expand=True)
        self.background.bind('<Configure>', self._resize_image)

    def _resize_image(self, event):
        self.image = self.img_copy.resize((self.master.winfo_width(), self.master.winfo_height()//2))

        self.background_image = ImageTk.PhotoImage(self.image)
        self.background.configure(image=self.background_image)


class Interface(tk.Frame):
    def __init__(self, master, folder, *args):
        super().__init__(master, *args)
        
        self.folder = folder
        
        #self.path_lst = ['11.png','22.png','33.png','44.png']  # change/add paths
        self.path_lst = [os.path.join(self.folder, name) for name in os.listdir(self.folder) if name.lower().endswith(('.png', '.jpg', '.gif'))]  # change/add paths
        
        self._frame_1 = None
        self._open_1 = False
        
        index_1 = 0
        index_2 = 1
        
        self.button1 = tk.Button(self, text='pack 1',
                      command=lambda:self.windows(lambda top:ShowImage(top, index_1, index_2, self.path_lst)))
        self.button1.pack()
 
    def windows(self, var_1):
        if not self._open_1:
            self.top1 = tk.Toplevel(self.master)
            self.top1.geometry('200x200')
                                
        container = var_1(self.top1)

        if self._frame_1 is not None:  
            self._frame_1.destroy()
            
        self._frame_1 = container
        self._frame_1.pack(fill='both', expand=True)
        self._open_1 = True

        self.top1.protocol('WM_DELETE_WINDOW', lambda: self.closed(1))
    
    def closed(self, number):
        if number == 1:
            self.top1.destroy()
            self._open_1 = False


class ShowImage(tk.Frame):
    def __init__(self, master, index_1, index_2, path_lst, *args, **kwargs):
        super().__init__(master, *args, **kwargs)
        
        if len(path_lst) > index_1:
            self.img = Array(self, path_lst[index_1])
            self.img.grid(column=0, row=0, sticky='news')
        
        if len(path_lst) > index_2:
            self.img2 = Array(self, path_lst[index_2])
            self.img2.grid(column=0, row=1, sticky='news')

        # column 0 will use full width
        self.grid_columnconfigure(0, weight=1)
        # row 0 will use 1/2 height AND row 1 will use 1/2 height
        self.grid_rowconfigure(0, weight=1)     
        self.grid_rowconfigure(1, weight=1)

# --- functions ---  # PEP8: `lower_case_names`

# empty

# --- main ---

if len(sys.argv) > 1:
    folder = sys.argv[1]
else:
    folder = os.getcwd()

#folder = FOLDER

root = tk.Tk()
frm = Interface(root, folder)
frm.pack()
root.mainloop()

BTW:

Because window has to display two images so I divide height by 2 ( self.master.winfo_height()//2 ) in Array to fit both rows/images in window.