Question

我创建了一个函数，它接受两个参数，打印多个语句并最终返回一个答案。它在python shell中运行良好。

我正在使用tkinter（python 3.4.1）为消费者创建一个用户友好的程序来使用我的功能。我希望我的函数输出所有内容（我使用的是列表框），然后用户可以滚动查看语句。但是，它只输出返回值，而不是print语句。为什么？

这是我的代码，我相信问题出在PageOne类中。

将tkinter导入为tk 来自tkinter import ttk 来自Collections import primes 来自Collections import isprime 来自Collections import LS import sys

LARGE_FONT = ("Verdana", 12)
NORM_FONT = ("Verdana", 10)
SMALL_FONT = ("Verdana", 8)

def popupmsg(msg):
    popup = tk.Tk()

popup.wm_title("!")
label = ttk.Label(popup, text=msg, font=NORM_FONT)
label.pack(side="top", fill="x", pady = 10)
B1 = ttk.Button(popup, text="Okay", command = popup.destroy)
B1.pack()
popup.mainloop()


class Mathapp(tk.Tk):

def __init__(self, *args, **kwargs):

    tk.Tk.__init__(self, *args, **kwargs)

    tk.Tk.iconbitmap(self, default="psi.ico")
    tk.Tk.wm_title(self, "Math App")

    container = tk.Frame(self)
    container.pack(side="top", fill="both", expand = True)
    container.grid_rowconfigure(0, weight=1)
    container.grid_columnconfigure(0, weight=1)

    menubar = tk.Menu(container)
    filemenu = tk.Menu(menubar, tearoff = 0)
    filemenu.add_command(label = "Save settings", command = lambda: popupmsg("Not supported just yet!"))
    filemenu.add_separator()
    filemenu.add_command(label = "Exit", command = quit)
    menubar.add_cascade(label = "File", menu=filemenu)

    prog = tk.Menu(menubar, tearoff = 0)
    prog.add_command(label = "Legendre Symbol", command = lambda: popupmsg("Not supported just yet!"))
    prog.add_command(label = "Prime Sieve", command = lambda: popupmsg("Not supported just yet!"))
    prog.add_command(label = "Prime Factorisation - Sieve", command = lambda: popupmsg("Not supported just yet!"))
    menubar.add_cascade(label = "Programs", menu=prog)

    tk.Tk.config(self, menu=menubar)

    self.frames = {}

    for F in (StartPage, PageOne, PageTwo, PageThree):

        frame = F(container, self)

        self.frames[F] = frame

        frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame(StartPage)

def show_frame(self, cont):

    frame = self.frames[cont]
    frame.tkraise()

class StartPage(tk.Frame):

def __init__(self, parent, controller):
    tk.Frame.__init__(self, parent)
    label = tk.Label(self, text="Start Page", font=LARGE_FONT)
    label.pack(pady = 10, padx = 10)

    button1 = ttk.Button(self, text="Legendre Symbol",
                        command = lambda: controller.show_frame(PageOne))
    button1.pack()

    button2 = ttk.Button(self, text="Prime test - Sieve",
                        command = lambda: controller.show_frame(PageTwo))
    button2.pack()

    button3 = ttk.Button(self, text="Prime Factorisation",
                        command = lambda: controller.show_frame(PageThree))
    button3.pack()



class PageOne(tk.Frame):

def __init__(self, parent, controller):
    tk.Frame.__init__(self, parent)
    label = tk.Label(self, text="Legendre Symbol", font=LARGE_FONT)
    label.pack(pady = 10, padx = 10)

    button1 = ttk.Button(self, text="Back to home",
                        command = lambda: controller.show_frame(StartPage))
    button1.pack()

    ##################

    def show_answer():
        Ans = str(LS(int(num1.get()),int(num2.get())))
        listbox.delete(0,"end")
        listbox.insert(0, LS(int(num1.get()),int(num2.get())))


    tk.Label(self, text = "Enter the numbers to be tested ").pack()
    num1 = tk.Entry(self)
    num1.pack()
    num2 = tk.Entry(self)
    num2.pack()
    blank = tk.Scrollbar(self)
    blank.pack()

    listbox= tk.Listbox(self, yscrollcommand=blank.set)
    listbox.pack()

    tk.Button(self, text = "Test", command = show_answer).pack()

    ##################

app = Mathapp()
app.mainloop()

Answer 1

看起来这个问题可能就在这里：

def show_answer():
    Ans = str(LS(int(num1.get()),int(num2.get())))
    listbox.delete(0,"end")
    listbox.insert(0, LS(int(num1.get()),int(num2.get())))

我建议从命令行创建几个条目小部件，并修改此函数，直到您可以获取并打印条目的内容。您可能在Ans和listbox.insert行中包含太多内容;尝试将不同的步骤分成不同的代码行。当您获得条目小部件内容时，您可以尝试一次一个地插入列表框的end索引（当然，如果其中没有任何内容，则会0，但{ {1}}如果已有项目。）

在tkinter中输出一个打印

1 个答案: