使用 python gui tkinter 的简单计算器

Question

我正在尝试制作一个简单的计算器，使用 Python 2.7.10 和 GUI 给出平方和平方根，但它不起作用我无法弄清楚问题是什么。我收到此错误：

> Exception in Tkinter callback Traceback (most recent call last): File
> "C:\Python27\lib\lib-tk\Tkinter.py", line 1536, in call return
> self.func(*args) File "C:/Users/Ali/Desktop/simplecalc.py", line 5, in
> do_sqrt root = x**0.5 TypeError: unsupported operand type(s) for ** or
> pow(): 'str' and 'float'

import Tkinter    
import tkMessageBox

def do_sqrt():
    root = x**0.5
    tkMessageBox.showinfo("Square Root = ", x)

def do_square():
    square = x**2
    tkMessageBox.showinfo("Square = ", x)

main_window = Tkinter.Tk()
main_window.title("Simple Calc")
number_input = (Tkinter.Entry(main_window))
x = number_input.get()
button_sqrt = Tkinter.Button(main_window, text = "Square Root", command = do_sqrt)
button_sqrt.pack()
button_square = Tkinter.Button(main_window, text = "Square", command =     do_square)
button_square.pack()
number_input.pack()

main_window.mainloop()

Answer 1

第 x = number_input.get() 行将 return 一个字符串，但您正试图将其用作数字。请改用行 x = float(number_input.get())。如果您包括错误打印输出，这将很清楚：

TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'float'

此外，最好避免使用全局变量，但那是另一回事了。

Answer 2

您正在从条目中读取字符串并尝试执行一些数学运算。而且您没有使用根变量和平方变量。

import Tkinter
import tkMessageBox


def do_sqrt():
    root = float(number_input.get())**0.5
    tkMessageBox.showinfo("Square Root = ", root)


def do_square():
    square = float(number_input.get())**2
    tkMessageBox.showinfo("Square = ", square)

main_window = Tkinter.Tk()
main_window.title("Simple Calc")
number_input = Tkinter.Entry(main_window)
button_sqrt = Tkinter.Button(main_window, text="Square Root", command=do_sqrt)
button_sqrt.pack()
button_square = Tkinter.Button(main_window, text="Square", command=do_square)
button_square.pack()
number_input.pack()

main_window.mainloop()

使用 python gui tkinter 的简单计算器

Simple calculator using python gui tkinter

python

tkinter

python-2.x

python-2.7