标签：bg get python gui place input entry button
作业要求
基于tkinter完成一个简易计算器
1 至少包含+-*/运算
2 能正确计算机结果
参考
https://blog.csdn.net/weixin_42795087/article/details/89931944?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522163920966316780274138563%2522%252C%2522scm%2522%253A%252220140713.130102334.pc%255Fall.%2522%257D&request_id=163920966316780274138563&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allfirst_rank_ecpm_v1~rank_v31_ecpm-2-89931944.pc_search_result_cache&utm_term=python%E8%AE%A1%E7%AE%97%E6%9C%BA&spm=1018.2226.3001.4187
代码与结果
#coding=utf-8
import tkinter
from functools import partial
def get_input(entry, argu):
input_data = entry.get()
if (input_data[-1:] == '+') and (argu == '+'):
return
if (input_data[-2:] == '+-') and (argu == '-'):
return
if (input_data[-2:] == '--') and (argu in ['-', '+']):
return
if (input_data[-2:] == '**') and (argu in ['*', '/']):
return
entry.insert("end", argu)
def backspace(entry):
input_len = len(entry.get())
entry.delete(input_len - 1)
def clear(entry):
entry.delete(0, "end")
def calc(entry):
input_data = entry.get()
if not input_data:
return
clear(entry)
try:
output_data = str(eval(input_data))
except Exception:
entry.insert("end", "Calculation error")
else:
if len(output_data) > 20:
entry.insert("end", "Value overflow")
else:
entry.insert("end", output_data)
if __name__ == '__main__':
root = tkinter.Tk()
root.title("Calculator")
root.resizable(0, 0)
button_bg = 'orange'
math_sign_bg = 'DarkTurquoise'
cal_output_bg = 'YellowGreen'
button_active_bg = 'gray'
entry = tkinter.Entry(root, justify="right", font=1)
entry.grid(row=0, column=0, columnspan=4, padx=10, pady=10)
def place_button(text, func, func_params, bg=button_bg, **place_params):
my_button = partial(tkinter.Button, root, bg=button_bg, padx=10, pady=3, activebackground=button_active_bg)
button = my_button(text=text, bg=bg, command=lambda: func(*func_params))
button.grid(**place_params)
place_button('7', get_input, (entry, '7'), row=1, column=0, ipadx=5, pady=5)
place_button('8', get_input, (entry, '8'), row=1, column=1, ipadx=5, pady=5)
place_button('9', get_input, (entry, '9'), row=1, column=2, ipadx=5, pady=5)
place_button('4', get_input, (entry, '4'), row=2, column=0, ipadx=5, pady=5)
place_button('5', get_input, (entry, '5'), row=2, column=1, ipadx=5, pady=5)
place_button('6', get_input, (entry, '6'), row=2, column=2, ipadx=5, pady=5)
place_button('1', get_input, (entry, '1'), row=3, column=0, ipadx=5, pady=5)
place_button('2', get_input, (entry, '2'), row=3, column=1, ipadx=5, pady=5)
place_button('3', get_input, (entry, '3'), row=3, column=2, ipadx=5, pady=5)
place_button('0', get_input, (entry, '0'), row=4, column=0, padx=8, pady=5,
columnspan=2, sticky=tkinter.E + tkinter.W + tkinter.N + tkinter.S)
place_button('.', get_input, (entry, '.'), row=4, column=2, ipadx=7, padx=5, pady=5)
place_button('+', get_input, (entry, '+'), bg=math_sign_bg, row=1, column=3, ipadx=5, pady=5)
place_button('-', get_input, (entry, '-'), bg=math_sign_bg, row=2, column=3, ipadx=5, pady=5)
place_button('*', get_input, (entry, '*'), bg=math_sign_bg, row=3, column=3, ipadx=5, pady=5)
place_button('/', get_input, (entry, '/'), bg=math_sign_bg, row=4, column=3, ipadx=5, pady=5)
place_button('<-', backspace, (entry,), row=5, column=0, ipadx=5, padx=5, pady=5)
place_button('C', clear, (entry,), row=5, column=1, pady=5, ipadx=5)
place_button('=', calc, (entry,), bg=cal_output_bg, row=5, column=2, ipadx=5, padx=5, pady=5,
columnspan=2, sticky=tkinter.E + tkinter.W + tkinter.N + tkinter.S)
root.mainloop()
标签：bg,get,python,gui,place,input,entry,button 来源： https://www.cnblogs.com/shengcongnianle/p/15675885.html
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