python中Tkinter练习(计算器)

今天看了小甲鱼的视频，发现了计算器还可以这样做，感觉很奇葩，另外学习了下，

小甲鱼原版代码如下：

#!/usr/bin/python
#coding: utf-8

from Tkinter import *

root = Tk()

frame = Frame(root)
frame.pack(padx = 10, pady = 10)

v1 = StringVar()
v2 = StringVar()
v3 = StringVar()

def test(content):
    # 如果是数字，返回真，否则返回假
    return content.isdigit()

# 把test函数包装起来，用于validatecommand中

testCMD = root.register(test)
Entry(frame,
           textvariable = v1, # 设置当v1的值改变的时候，当前框体中的值也发生变化
           validate = "key",  # 当在输入框输入东西的时候直接进行验证
           validatecommand = (testCMD, "%P"),
           ).grid(row = 0, column = 0)

Label(frame, text = "+").grid(row = 0, column = 1)

Entry(frame,
           textvariable = v2,
           validate = "key",
           validatecommand = (testCMD, "%P"),
           ).grid(row = 0, column = 2)

Label(frame, text = "=").grid(row = 0, column = 3)

Entry(frame,
           textvariable = v3,
           state = "readonly" # 设置不能修改这个框体中的值
           ).grid(row = 0, column = 4)

def calc():
    result = int(v1.get()) + int(v2.get())
    return v3.set(str(result))

Button(frame, text = "计算结果", command = calc).grid(row = 1, column = 2)

root.mainloop()

相对来说，个人认为，上面的代码加上一个退出，再加一个单选框，用来选择哪一种运算符来进行操作，效果会更好，于是实践了一把，代码如下：

#!/usr/bin/python
#coding: utf-8

from Tkinter import *

root = Tk()

frame = Frame(root)
frame.pack(padx = 10, pady = 10)

# Label(frame, text = "简易计算器", font = ("宋体", 20)).grid(row = 0, column = 2)

v1 = StringVar()
v2 = StringVar()
v3 = StringVar()

def test(content):
    # 如果是数字，返回真，否则返回假
    return content.isdigit()

# 把test函数包装起来，用于validatecommand中
testCMD = root.register(test)
Entry(frame,
           textvariable = v1, # 设置当v1的值改变的时候，当前框体中的值也发生变化
           validate = "key",  # 当在输入框输入东西的时候直接进行验证
           validatecommand = (testCMD, "%P"),
           ).grid(row = 2, column = 0)

v = IntVar()
calcs = [
    ('+', 1),
    ('-', 2),
    ("*", 3),
    ("/", 4),
    ("%", 5)
]
for _calc, num in calcs:
    # 设置单选框，用来显示运算符
    Radiobutton(frame,
                text = _calc,
                variable = v,
                value = num).grid(row = num - 1, column = 1, sticky = W)

Entry(frame,
           textvariable = v2,
           validate = "key",
           validatecommand = (testCMD, "%P"),
           ).grid(row = 2, column = 2)

Label(frame, text = "=").grid(row = 2, column = 3)

Entry(frame,
           textvariable = v3,
           state = "readonly" # 设置不能修改这个框体中的值
           ).grid(row = 2, column = 4)


def judge(x, y, z):
    if y == 1:
        return x + z
    elif y == 2:
        return x - z
    elif y == 3:
        return x * z
    elif y == 4:
        t = x / z
        return (x / z) if t * z == x else (x * 1.0 / z)
    elif y == 5:
        return x % z

def calc():
    # 根据calcs列表中的值来判断此时的计算符号
    s = int(v.get())
    result = judge(int(v1.get()), s, int(v2.get()))
    return v3.set(str(result))

Button(frame, text = "计算结果",
       width = 10,
       command = calc).grid(row = 3, column = 2)
Button(frame,
       text = "退出",
       width = 10,
       command = root.quit).grid(row = 3, column = 4)

root.mainloop()

瞅一下运行界面(丑哭)

当然，还可以增加更多的功能，把旁边的那些没用的区域找东西给替换了，这样界面更完美，还有就是弄一个菜单选项等等，有兴趣的读者自己去尝试啦！！！！