Python實(shí)現(xiàn)簡(jiǎn)易計(jì)算器的示例代碼

更新時(shí)間：2022年11月22日 10:12:07 作者：羊必瘦

Tkinter作為 Python GUI 開發(fā)工具之一，它具有 GUI 軟件包的必備的常用功能。本文就將利用Tkinter編寫簡(jiǎn)易的計(jì)算器，感興趣的可以了解一下

實(shí)現(xiàn)流程

1.計(jì)算機(jī)布局

2.計(jì)算機(jī)執(zhí)行

首先導(dǎo)入模塊:

Tkinter 作為 Python GUI 開發(fā)工具之一，它具有 GUI 軟件包的必備的常用功能。比如，它提供了十多種不同類型的窗口控件、窗口布局管理器、事件處理機(jī)制等，加之其開發(fā)效率高、代碼簡(jiǎn)潔易讀

import tkinter as tk
#Python3標(biāo)準(zhǔn)安裝包中自帶tkinter，即不用安裝，導(dǎo)入即可使用。
#可以從命令行運(yùn)行python -m tkinter會(huì)打開一個(gè)窗口
#演示一個(gè)簡(jiǎn)單的Tk接口，證明tkinter已正確安裝在系統(tǒng)上.
#python -m tkinter

計(jì)算器布局

1、先完成整個(gè)計(jì)算機(jī)的布局及其它輸出結(jié)果的一欄

前面完成整體布局就細(xì)化計(jì)算器中的按鈕

1、前四行代碼是定義按鈕的符號(hào)、長(zhǎng)寬、字體、顏色

2、后四行是按鈕的間距

root = tk.Tk()
root.title('計(jì)算器')
root.geometry('295x280+100+100') #邊距
font = ('宋體', 20)
font_16 = ('宋體', 16)
root.attributes("-alpha", 0.9) #設(shè)置透明度
 
result_num = tk.StringVar() #賦予可變變量
result_num.set('')
 
tk.Label(root,
         textvariable=result_num, font=font, height=2,
         width=20, justify=tk.LEFT, anchor=tk.SE
         ).grid(row=1, column=1, columnspan=4) #顯示結(jié)果的布局
 
 
button_clear = tk.Button(root, text='C', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2') #定義按鈕的符號(hào)、長(zhǎng)寬、字體、顏色
button_back = tk.Button(root, text='←', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2') #定義按鈕的符號(hào)、長(zhǎng)寬、字體、顏色
button_division = tk.Button(root, text='÷', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2') #定義按鈕的符號(hào)、長(zhǎng)寬、字體、顏色
button_multiplication = tk.Button(root, text='×', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2') #定義按鈕的符號(hào)、長(zhǎng)寬、字體、顏色
button_clear.grid(row=2, column=1, padx=4, pady=2)
button_back.grid(row=2, column=2, padx=4, pady=2)
button_division.grid(row=2, column=3, padx=4, pady=2)
button_multiplication.grid(row=2, column=4, padx=4, pady=2) #定義按鈕位置
 
#依葫蘆畫瓢
button_seven = tk.Button(root, text='7', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_eight = tk.Button(root, text='8', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_nine = tk.Button(root, text='9', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_subtraction = tk.Button(root, text='-', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_seven.grid(row=3, column=1, padx=4, pady=2)
button_eight.grid(row=3, column=2, padx=4, pady=2)
button_nine.grid(row=3, column=3, padx=4, pady=2)
button_subtraction.grid(row=3, column=4, padx=4, pady=2)
 
#依葫蘆畫瓢
button_four = tk.Button(root, text='4', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_five = tk.Button(root, text='5', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_six = tk.Button(root, text='6', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_addition = tk.Button(root, text='+', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_four.grid(row=4, column=1, padx=4, pady=2)
button_five.grid(row=4, column=2, padx=4, pady=2)
button_six.grid(row=4, column=3, padx=4, pady=2)
button_addition.grid(row=4, column=4, padx=4, pady=2)
 
#依葫蘆畫瓢
button_one = tk.Button(root, text='1', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_two = tk.Button(root, text='2', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_three = tk.Button(root, text='3', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_equal = tk.Button(root, text='=', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_one.grid(row=5, column=1, padx=4, pady=2)
button_two.grid(row=5, column=2, padx=4, pady=2)
button_three.grid(row=5, column=3, padx=4, pady=2)
button_equal.grid(row=5, column=4, padx=4, pady=2)
 
 
button_zero1 = tk.Button(root, text=' ', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_zero = tk.Button(root, text='0', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_dot = tk.Button(root, text='.', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_equal2 = tk.Button(root, text=' ', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_zero1.grid(row=6, column=1, padx=4, pady=2)
button_zero.grid(row=6, column=2, padx=4, pady=2)
button_dot.grid(row=6, column=3, padx=4, pady=2)
button_equal2.grid(row=6, column=4, padx=4, pady=2)

計(jì)算機(jī)執(zhí)行

計(jì)算器布局完成后（主體和細(xì)節(jié)）賦予計(jì)算器計(jì)算能力

1、點(diǎn)擊按鈕實(shí)現(xiàn)出現(xiàn)結(jié)果輸出欄及計(jì)算器的輸出欄

2、賦予事件能力

def click_button(x):
    print('X:\t', x)
    result_num.set(result_num.get() + x)

點(diǎn)擊按鈕可以輸入所對(duì)應(yīng)的結(jié)果并且調(diào)用lambda函數(shù)計(jì)算輸入結(jié)果并反饋

ambda 函數(shù)是匿名的：所謂匿名函數(shù)，通俗地說就是沒有名字的函數(shù)。lambda函數(shù)沒有名字。 lambda 函數(shù)有輸入和輸出：輸入是傳入到參數(shù)列表argument_list的值，輸出是根據(jù)表達(dá)式expression計(jì)算得到的值。

button_one.config(command=lambda: click_button('1'))
button_two.config(command=lambda: click_button('2'))
button_three.config(command=lambda: click_button('3'))
button_four.config(command=lambda: click_button('4'))
button_five.config(command=lambda: click_button('5'))
button_six.config(command=lambda: click_button('6'))
button_seven.config(command=lambda: click_button('7'))
button_eight.config(command=lambda: click_button('8'))
button_nine.config(command=lambda: click_button('9'))
button_zero.config(command=lambda: click_button('0'))
button_dot.config(command=lambda: click_button('.'))
button_addition.config(command=lambda: click_button('+'))
button_subtraction.config(command=lambda: click_button('-'))
button_multiplication.config(command=lambda: click_button('*'))
button_division.config(command=lambda: click_button('/'))
button_clear.config(command=lambda: btnClearDisplay())
button_equal.config(command=calculation)

調(diào)用calculation時(shí)間用來計(jì)算輸入結(jié)果其中str來轉(zhuǎn)化字符串.

調(diào)用btnClearDisplay清除來清空輸入結(jié)果

def calculation():
    opt_str = result_num.get()
    result = eval(opt_str)
    result_num.set(str(result))
 
 
def btnClearDisplay():
    opt_str = result_num.get()
    result = eval(str(opt_str))
    result_num.set("")

最后一行代碼不需要觸發(fā)lambda 因?yàn)椴恍枰涿瘮?shù)也不用傳遞參數(shù)

button_clear.config(command=lambda: btnClearDisplay())
button_equal.config(command=calculation)

代碼展示

import tkinter as tk
 
root = tk.Tk()
root.title('計(jì)算器')
root.geometry('295x280+100+100')
font = ('宋體', 20)
font_16 = ('宋體', 16)
root.attributes("-alpha", 0.9)
 
result_num = tk.StringVar()
result_num.set('')
 
tk.Label(root,
         textvariable=result_num, font=font, height=2,
         width=20, justify=tk.LEFT, anchor=tk.SE
         ).grid(row=1, column=1, columnspan=4)
 
 
button_clear = tk.Button(root, text='C', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_back = tk.Button(root, text='←', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_division = tk.Button(root, text='÷', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_multiplication = tk.Button(root, text='×', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_clear.grid(row=2, column=1, padx=4, pady=2)
button_back.grid(row=2, column=2, padx=4, pady=2)
button_division.grid(row=2, column=3, padx=4, pady=2)
button_multiplication.grid(row=2, column=4, padx=4, pady=2)
 
 
button_seven = tk.Button(root, text='7', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_eight = tk.Button(root, text='8', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_nine = tk.Button(root, text='9', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_subtraction = tk.Button(root, text='-', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_seven.grid(row=3, column=1, padx=4, pady=2)
button_eight.grid(row=3, column=2, padx=4, pady=2)
button_nine.grid(row=3, column=3, padx=4, pady=2)
button_subtraction.grid(row=3, column=4, padx=4, pady=2)
 
button_four = tk.Button(root, text='4', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_five = tk.Button(root, text='5', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_six = tk.Button(root, text='6', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_addition = tk.Button(root, text='+', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_four.grid(row=4, column=1, padx=4, pady=2)
button_five.grid(row=4, column=2, padx=4, pady=2)
button_six.grid(row=4, column=3, padx=4, pady=2)
button_addition.grid(row=4, column=4, padx=4, pady=2)
 
 
button_one = tk.Button(root, text='1', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_two = tk.Button(root, text='2', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_three = tk.Button(root, text='3', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_equal = tk.Button(root, text='=', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_one.grid(row=5, column=1, padx=4, pady=2)
button_two.grid(row=5, column=2, padx=4, pady=2)
button_three.grid(row=5, column=3, padx=4, pady=2)
button_equal.grid(row=5, column=4, padx=4, pady=2)
 
 
button_zero1 = tk.Button(root, text=' ', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_zero = tk.Button(root, text='0', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_dot = tk.Button(root, text='.', width=5, font=font_16, relief=tk.FLAT, bg='#eacda1')
button_equal2 = tk.Button(root, text=' ', width=5, font=font_16, relief=tk.FLAT, bg='#b1b2b2')
button_zero1.grid(row=6, column=1, padx=4, pady=2)
button_zero.grid(row=6, column=2, padx=4, pady=2)
button_dot.grid(row=6, column=3, padx=4, pady=2)
button_equal2.grid(row=6, column=4, padx=4, pady=2)
 
 
def click_button(x):
    print('X:\t', x)
    result_num.set(result_num.get() + x)
 
 
def calculation():
    opt_str = result_num.get()
    result = eval(opt_str)
    result_num.set(str(result))
 
 
def btnClearDisplay():
    opt_str = result_num.get()
    result = eval(str(opt_str))
    result_num.set("")
 
 
button_one.config(command=lambda: click_button('1'))
button_two.config(command=lambda: click_button('2'))
button_three.config(command=lambda: click_button('3'))
button_four.config(command=lambda: click_button('4'))
button_five.config(command=lambda: click_button('5'))
button_six.config(command=lambda: click_button('6'))
button_seven.config(command=lambda: click_button('7'))
button_eight.config(command=lambda: click_button('8'))
button_nine.config(command=lambda: click_button('9'))
button_zero.config(command=lambda: click_button('0'))
button_dot.config(command=lambda: click_button('.'))
button_addition.config(command=lambda: click_button('+'))
button_subtraction.config(command=lambda: click_button('-'))
button_multiplication.config(command=lambda: click_button('*'))
button_division.config(command=lambda: click_button('/'))
button_clear.config(command=lambda: btnClearDisplay())
button_equal.config(command=calculation)
 
 
root.mainloop()