Python3 + Tkinter上的生成器

Question

我尝试制作一个数字生成器（所以如何通过乐透 - 数字从 - 到，并需要从中获取一些数量（例如：1-50中的6个数字））。 这是代码：`

from tkinter import *

def printer(event):
    import random
    s = random.sample(range("a", "b"),"c")
    print(s)
    return

root = Tk()

s = StringVar()

lab = Label(root, text="Minimum", font="Arial 10")
ent = Entry(root,width=20,bd=3,text="a")
lab.pack()
ent.pack()

lab = Label(root, text="Maximum", font="Arial 10")
ent = Entry(root,width=20,bd=3,text="b")
lab.pack()
ent.pack()

lab = Label(root, text="Quantity", font="Arial 10")
ent = Entry(root,width=20,bd=3,text="c")
lab.pack()
ent.pack()


but = Button(root, text="GO!",
             width=20,height=5,
             bg="green",fg="yellow")
but.bind("<Button-1>", printer)
but.pack()

lab = Label(root, text="Result", font="Arial 10")
ent = Entry(root,width=20,bd=3,text=(printer))
lab.pack()
ent.pack()

root.mainloop()` 

但是，当我点击“开始”按钮时，我得到了：

"Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.4/tkinter/__init__.py", line 1490, in __call__
    return self.func(*args)
  File "/home/juri/lotto_gui.py", line 5, in printer
    s = random.sample(range("a", "b"),"c")
TypeError: Can't convert 'int' object to str implicitly"

我做错了什么？请帮帮我！

Answer 1

好的，我想我明白不了。我更改了您的代码以使其正常工作：

from tkinter import *


def printer(event):
    global s # use global StringVar to show the results
    import random

    r_sample = random.sample(range(a.get(), b.get()), c.get())

    # set the s variable with the random sample
    s.set(",".join(map(str,r_sample)))
    return

root = Tk()



s = StringVar()

# IntVars added here
a = IntVar()
b = IntVar()
c = IntVar()


lab = Label(root, text="Minimum", font="Arial 10")
ent = Entry(root,width=20,bd=3, textvariable=a)
lab.pack()
ent.pack()

lab = Label(root, text="Maximum", font="Arial 10")
ent = Entry(root,width=20,bd=3, textvariable=b)
lab.pack()
ent.pack()

lab = Label(root, text="Quantity", font="Arial 10")
ent = Entry(root,width=20,bd=3, textvariable=c)
lab.pack()
ent.pack()


but = Button(root, text="GO!",
             width=20,height=5,
             bg="green",fg="yellow")
but.bind("<Button-1>", printer)
but.pack()

lab = Label(root, text="Result", font="Arial 10")
ent = Entry(root,width=20,bd=3, textvariable=s)
lab.pack()
ent.pack()

root.mainloop()

基本上，我将a，b，c变量设为IntVar。同时修复了printer，以便它使用三个变量，并更新s变量。