请提前原谅我,因为我对Python很陌生。我正在将这个代码放在一个非常简单的速率计算器中,并希望在按下Enter键的时候将程序计算到总计(执行计算命令)。 Python返回一个错误,说没有定义Calculate,但是我已经在上面定义了几行。有什么想法吗?
import tkinter
from tkinter import ttk
from tkinter import *
root = Tk()
root.withdraw()
class Adder(ttk.Frame):
"""The adders gui and functions."""
def __init__(self, parent, *args, **kwargs):
ttk.Frame.__init__(self, parent, *args, **kwargs)
self.root = parent
self.init_gui()
def on_quit(self):
"""Exits program."""
quit()
def calculate(self, *args):
"""Calculates the sum of the two inputted numbers."""
num1 = int(self.num1_entry.get())
num2 = float(self.num2_entry.get())
num3 = ((num1/2000) * num2)
self.answer_label['text'] = num3
def init_gui(self):
self.root.title('Breakbulk Rate Calculator')
self.root.option_add('*tearOff', 'FALSE')
self.grid(column=0, row=0, sticky='nsew')
self.menubar = tkinter.Menu(self.root)
self.menu_file = tkinter.Menu(self.menubar)
self.menu_file.add_command(label='Exit', command=self.on_quit)
self.menu_edit = tkinter.Menu(self.menubar)
self.menubar.add_cascade(menu=self.menu_file, label='File')
self.menubar.add_cascade(menu=self.menu_edit, label='Edit')
self.root.config(menu=self.menubar)
self.num1_entry = ttk.Entry(self, width=5)
self.num1_entry.grid(column=1, row = 2)
self.num2_entry = ttk.Entry(self, width=5)
self.num2_entry.grid(column=3, row=2)
self.calc_button = ttk.Button(self, text='Calculate',
command=self.calculate)
self.calc_button.grid(column=0, row=3, columnspan=4)
self.answer_frame = ttk.LabelFrame(self, text='Answer',
height=100)
self.answer_frame.grid(column=0, row=4, columnspan=4, sticky='nesw')
self.answer_label = ttk.Label(self.answer_frame, text='')
self.answer_label.grid(column=0, row=0)
# Labels that remain constant throughout execution.
ttk.Label(self, text='Breakbulk Rate Calculator').grid(column=0, row=0,
columnspan=4)
ttk.Label(self, text='Weight').grid(column=0, row=2,
sticky='w')
ttk.Label(self, text='Rate').grid(column=2, row=2,
sticky='w')
ttk.Separator(self, orient='horizontal').grid(column=0,
row=1, columnspan=4, sticky='ew')
for child in self.winfo_children():
child.grid_configure(padx=5, pady=5)
root.bind('<Return>', calculate)
if __name__ == '__main__':
root = tkinter.Tk()
Adder(root)
root.mainloop()
答案 0 :(得分:1)
我已稍微重新组织了您的代码,因此当您按下按钮或按 Enter 时,它现在调用calculate
方法。
import tkinter as tk
from tkinter import ttk
class Adder(ttk.Frame):
"""The adders gui and functions."""
def __init__(self, parent, *args, **kwargs):
ttk.Frame.__init__(self, parent, *args, **kwargs)
self.root = parent
self.init_gui()
def on_quit(self):
"""Exits program."""
tk.quit()
def calculate(self, *args):
"""Calculates the sum of the two inputted numbers."""
num1 = int(self.num1_entry.get())
num2 = float(self.num2_entry.get())
num3 = ((num1/2000) * num2)
self.answer_label['text'] = num3
def init_gui(self):
self.root.title('Breakbulk Rate Calculator')
self.root.option_add('*tearOff', 'FALSE')
self.grid(column=0, row=0, sticky='nsew')
self.menubar = tk.Menu(self.root)
self.menu_file = tk.Menu(self.menubar)
self.menu_file.add_command(label='Exit', command=self.on_quit)
self.menu_edit = tk.Menu(self.menubar)
self.menubar.add_cascade(menu=self.menu_file, label='File')
self.menubar.add_cascade(menu=self.menu_edit, label='Edit')
self.root.config(menu=self.menubar)
self.num1_entry = ttk.Entry(self, width=5)
self.num1_entry.grid(column=1, row = 2)
self.num2_entry = ttk.Entry(self, width=5)
self.num2_entry.grid(column=3, row=2)
self.calc_button = ttk.Button(self, text='Calculate',
command=self.calculate)
self.calc_button.grid(column=0, row=3, columnspan=4)
self.answer_frame = ttk.LabelFrame(self, text='Answer',
height=100)
self.answer_frame.grid(column=0, row=4, columnspan=4, sticky='nesw')
self.answer_label = ttk.Label(self.answer_frame, text='')
self.answer_label.grid(column=0, row=0)
# Labels that remain constant throughout execution.
ttk.Label(self, text='Breakbulk Rate Calculator').grid(column=0, row=0,
columnspan=4)
ttk.Label(self, text='Weight').grid(column=0, row=2,
sticky='w')
ttk.Label(self, text='Rate').grid(column=2, row=2,
sticky='w')
ttk.Separator(self, orient='horizontal').grid(column=0,
row=1, columnspan=4, sticky='ew')
for child in self.winfo_children():
child.grid_configure(padx=5, pady=5)
self.root.bind('<Return>', lambda event: self.calculate())
if __name__ == '__main__':
root = tk.Tk()
Adder(root)
root.mainloop()
要为.bind
创建一个具有正确签名的回调,我使用了一个简单地丢弃传递给它的Event对象的lambda函数。
我还摆脱了邪恶的from tkinter import *
通配符导入。
答案 1 :(得分:0)
问题来自你的代码部分
root.bind('<Return>', calculate)
将其更改为
root.bind('<Return>', self.calculate)
它会起作用。