更有效地调用类的方法

Question

我的代码没有任何问题，我只是想看看是否有一个更短的方式来做的

def taskcreator(first,second,third):
    first.needs()
    second.needs()
    third.needs()

如果我可以做这样的事情

def taskcreator(first,second,third):
    (first,second,third).needs()

因为我将创建一个'很多更多的对象，我喜欢尽量减少我的代码数量，并使我的代码更有效.预先感谢您的帮助。

import tkinter as tk
from tkinter import ttk

screen = tk.Tk()

class Crop:
    def __init__(self,sizename,sizevar,onvar,xvalue,yvalue):
        sizevar = tk.StringVar()
        self.sizename = sizename
        self.sizevar = sizevar
        self.onvar = onvar
        self.offvalue = 'no'
        self.cb = tk.Checkbutton(screen, text=self.sizename, variable=self.sizevar, onvalue=self.onvar, offvalue=self.offvalue)
        self.cb.deselect()
        self.cb.place(x=xvalue, y=yvalue)

    def needs(self): 
        value = self.sizevar.get()
        print(value)
        if value != 'no':
            print(self.sizename + ' has been checked')
        else:
            print(self.sizename + ' has not be checked')


def main():

    labell = tk.Label(screen, text='Enter Shoe Link').place(x=10, y=20)
    first = Crop('UK 2.5', 'twohalf', 'twohalfon', 10, 110)
    second = Crop('UK 3', 'three', 'threeon', 200, 110)
    third = Crop('UK 3.5', 'threehalf', 'threehalfon', 10, 150)
    fourth = Crop('UK 4', 'four', 'fouron', 200, 150)
    fith = Crop('UK 4.5', 'fourhalf', 'fourhalfon', 10, 190)
    sixth = Crop('UK 5', 'five', 'fiveon', 200, 190)
    seventh = Crop('UK 5.5', 'fivehalf', 'fivehalfon', 10, 230)
    eigth = Crop('UK 6', 'sixth', 'sixthon', 200, 230)
    ninth = Crop('UK 6.5', 'sixthhalf', 'sixthhalfon', 10, 270)
    tenth = Crop('UK 7', 'seven', 'sevenon', 200, 270)
    newtaskbutton = tk.Button(screen, text='Start', command=lambda: taskcreator(first,second,third))
    newtaskbutton.place(x=30,y=10)

def taskcreator(first,second,third):
    first.needs()
    second.needs()
    third.needs()
main()
screen.mainloop()

Answer 1

你可以使用 getattr 和 *args 来实现这一目的。

def taskcreator(*args):
    for arg in args:
        getattr(arg, 'needs')()

*args 把所有传递到函数中的参数都存储起来，作为一个 tuple 叫做 args.

getattr 按名称获取对象的an属性--在本例中是指 needs 每个 arg