如何将变量从另一个函数导入到另一个函数

时间:2019-08-12 09:21:35

标签: python python-3.x tkinter

我试图使用Pycharm和tkinter制作一个简单的简单兴趣计算器。

有我的代码 显示x尚未定义

我已经尝试将变量设置为全局变量。

我也无法在我的finalProgram函数中调用该函数,因为它使它成为无穷循环

from tkinter import *


def mainWindow():

    label = Label(frame, text = "What do you want to do")
    label.pack()
    but1 = Button(frame, text = "SI", command = SimpleInterest)
    but1.pack()

def SimpleInterest():
    global x
    frame.destroy()
    label5 = Label(frame2,text="Please enter principal amount" )
    label5.pack()
    p = Entry(frame2 )
    p.pack()
    label6 = Label(frame3,text="Please ROI")
    label6.pack()
    r = Entry(frame3, text="Please enter rate of interest")
    r.pack()
    label7 = Label(frame4, text="Please enter time")
    label7.pack()
    t = Entry(frame4, text="Please enter time")
    t.pack()
    buttonmain = Button(frame4, text = "Finlise", command = finalProgram)
    buttonmain.pack()
    global x
    x =(p*r*t)/100
def finalProgram():
    frame2.destroy()
    frame3.destroy()
    frame4.destroy()
    global x
    newlabel = Label(frame5, text = x)


root = Tk()
frame = Frame(root)
frame.grid(row=0,columnspan = 2)
mainWindow()
frame2 = Frame(root)
frame2.grid(row = 0, columnspan =2)
frame3 = Frame(root)
frame3.grid(row =1, columnspan =2)
frame4 = Frame(root)
frame4.grid(row=2, columnspan =2)
frame5 = Frame(root)
frame5.grid(row=0)

root.mainloop()

1 个答案:

答案 0 :(得分:1)

您的代码只有一种修改。在下部添加了一行:

x = 0.0

这是为了确保您在全局范围内具有变量x。有了全局范围内的变量,您就可以在函数中使用(读取和写入)它(在您用global x声明为全局变量之后)

from tkinter import *


def mainWindow():

    label = Label(frame, text = "What do you want to do")
    label.pack()
    but1 = Button(frame, text = "SI", command = SimpleInterest)
    but1.pack()

def SimpleInterest():
    global x
    frame.destroy()
    label5 = Label(frame2,text="Please enter principal amount" )
    label5.pack()
    p = Entry(frame2 )
    p.pack()
    label6 = Label(frame3,text="Please ROI")
    label6.pack()
    r = Entry(frame3, text="Please enter rate of interest")
    r.pack()
    label7 = Label(frame4, text="Please enter time")
    label7.pack()
    t = Entry(frame4, text="Please enter time")
    t.pack()
    buttonmain = Button(frame4, text = "Finlise", command = finalProgram)
    buttonmain.pack()
    global x
    x =(p*r*t)/100
def finalProgram():
    frame2.destroy()
    frame3.destroy()
    frame4.destroy()
    global x
    newlabel = Label(frame5, text = x)

x = 0.0
root = Tk()
frame = Frame(root)
frame.grid(row=0,columnspan = 2)
mainWindow()
frame2 = Frame(root)
frame2.grid(row = 0, columnspan =2)
frame3 = Frame(root)
frame3.grid(row =1, columnspan =2)
frame4 = Frame(root)
frame4.grid(row=2, columnspan =2)
frame5 = Frame(root)
frame5.grid(row=0)

root.mainloop()

请注意,这只是针对您所问问题的快速修复。代码的总体结构并不是很好,您应该考虑学习诸如类的概念和/或如何将参数传递给函数。