牛顿公式使用tkinter/using一个按钮进行多次计算
Newton's square formula using tkinter/using a button for computations multiple times
我是 python 的新手。我的问题是：我可以多次使用一个按钮 "Estimate" 来计算我的答案吗？更具体地说，该项目是将牛顿公式实施到 tkinter 中。如果输入为 0，则计算 estimateVar 文本框的结果为 0。如果输入为正数，我应该能够使用我的估计按钮作为循环多次处理该数字。我很容易使用嵌套的 while 循环获得最终结果。然而，尝试重新使用估算按钮来逐步进入算法似乎是不可能的。我已经尝试了一切。我最接近的是设置我的 inputVar 来复制我的 estimateVar，但这显然会导致逻辑错误，因为输入需要保持不变。另外，我已经尝试为估计设置一个全局变量，但是 python 不允许我操纵估计和我的 inputVar returns 全局值。估计的初始值必须为 1。如果有人有任何意见，将不胜感激。这是我的代码
'''
Created on Nov 11, 2015
@author: lz206729
'''
from tkinter import *
class newtonGUI(Frame):
def __init__(self):
#Sets up window
Frame.__init__(self)
self.master.title("Newton's Square")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number to square: ")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Displays the common square root
self._estimateLabel = Label(self, text = "The estimate is : ")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateEntry = Entry(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
tolerance = 0.000001
estimate = 1
x = self._inputVar.get()
if x == 0:
self._estimateVar.set(x / 2)
else:
while True:
estimate = (estimate + x / estimate)/2
difference = abs(x - estimate **2)
if difference <= tolerance:
break
self._estimateVar.set(estimate)
def _reset(self):
self._inputVar.set(0)
self._estimateVar.set(0)
self._estimateButton.config(state='normal')
def main():
newtonGUI().mainloop()
main()
你的目标和问题不明确，但根据"estimate button to step into the algorithm incrementally"我认为你想要的是。
from tkinter import *
class newtonGUI(Frame):
def __init__(self, master):
#Set up frame
Frame.__init__(self, master)
self.master.title("Newton's Squareroot")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputVar.set(1.0)
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Display the common square root
self._estimateLabel = Label(self, text = "Square root estimate")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateVar.set(1.0)
self._estimateEntry = Label(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
val = self._inputVar.get()
est = self._estimateVar.get()
if val <= 0.0:
self._estimateVar.set(0.0)
else:
self._estimateVar.set((est + val / est) / 2)
def _reset(self):
self._inputVar.set(1.0)
self._estimateVar.set(1.0)
def main():
root = Tk()
newtonGUI(root)
root.mainloop()
main()
谢谢，
绝对让我朝着正确的方向前进。我什至没有考虑将我的初始值设置为 1。起初代码只执行公共平方值，所以我修改了它。再次感谢。这是最后的程序。
from tkinter import *
class newtonGUI(Frame):
def __init__(self, master):
#Set up frame
Frame.__init__(self, master)
self.master.title("Newton's Squareroot")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputVar.set(1.0)
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Display the common square root
self._estimateLabel = Label(self, text = "Square root estimate")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateVar.set(1.0)
self._estimateEntry = Label(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
value = self._inputVar.get()
estimate = self._estimateVar.get()
tolerance = 0.000001
if value <= 0.0:
self._estimateVar.set(0.0)
else:
estimate = (estimate + value / estimate) / 2
difference = abs(value - estimate **2)
if difference <= tolerance:
self._estimateVar.set(estimate)
self._estimateButton.config(state = 'disabled')
else:
self._estimateVar.set(estimate)
def _reset(self):
self._inputVar.set(1.0)
self._estimateVar.set(1.0)
def main():
root = Tk()
newtonGUI(root)
root.mainloop()
main()
我是 python 的新手。我的问题是：我可以多次使用一个按钮 "Estimate" 来计算我的答案吗？更具体地说，该项目是将牛顿公式实施到 tkinter 中。如果输入为 0，则计算 estimateVar 文本框的结果为 0。如果输入为正数，我应该能够使用我的估计按钮作为循环多次处理该数字。我很容易使用嵌套的 while 循环获得最终结果。然而，尝试重新使用估算按钮来逐步进入算法似乎是不可能的。我已经尝试了一切。我最接近的是设置我的 inputVar 来复制我的 estimateVar，但这显然会导致逻辑错误，因为输入需要保持不变。另外，我已经尝试为估计设置一个全局变量，但是 python 不允许我操纵估计和我的 inputVar returns 全局值。估计的初始值必须为 1。如果有人有任何意见，将不胜感激。这是我的代码
'''
Created on Nov 11, 2015
@author: lz206729
'''
from tkinter import *
class newtonGUI(Frame):
def __init__(self):
#Sets up window
Frame.__init__(self)
self.master.title("Newton's Square")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number to square: ")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Displays the common square root
self._estimateLabel = Label(self, text = "The estimate is : ")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateEntry = Entry(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
tolerance = 0.000001
estimate = 1
x = self._inputVar.get()
if x == 0:
self._estimateVar.set(x / 2)
else:
while True:
estimate = (estimate + x / estimate)/2
difference = abs(x - estimate **2)
if difference <= tolerance:
break
self._estimateVar.set(estimate)
def _reset(self):
self._inputVar.set(0)
self._estimateVar.set(0)
self._estimateButton.config(state='normal')
def main():
newtonGUI().mainloop()
main()
你的目标和问题不明确，但根据"estimate button to step into the algorithm incrementally"我认为你想要的是。
from tkinter import *
class newtonGUI(Frame):
def __init__(self, master):
#Set up frame
Frame.__init__(self, master)
self.master.title("Newton's Squareroot")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputVar.set(1.0)
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Display the common square root
self._estimateLabel = Label(self, text = "Square root estimate")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateVar.set(1.0)
self._estimateEntry = Label(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
val = self._inputVar.get()
est = self._estimateVar.get()
if val <= 0.0:
self._estimateVar.set(0.0)
else:
self._estimateVar.set((est + val / est) / 2)
def _reset(self):
self._inputVar.set(1.0)
self._estimateVar.set(1.0)
def main():
root = Tk()
newtonGUI(root)
root.mainloop()
main()
谢谢， 绝对让我朝着正确的方向前进。我什至没有考虑将我的初始值设置为 1。起初代码只执行公共平方值，所以我修改了它。再次感谢。这是最后的程序。
from tkinter import *
class newtonGUI(Frame):
def __init__(self, master):
#Set up frame
Frame.__init__(self, master)
self.master.title("Newton's Squareroot")
self.grid(column = 0, row = 0)
#Label and field for number input
self._inputLabel = Label(self, text = "Input a positive number")
self._inputLabel.grid(row = 0, column = 0)
self._inputVar = DoubleVar()
self._inputVar.set(1.0)
self._inputEntry = Entry(self, textvariable = self._inputVar)
self._inputEntry.grid(row = 0, column = 1)
#Display the common square root
self._estimateLabel = Label(self, text = "Square root estimate")
self._estimateLabel.grid(row = 1, column = 0)
self._estimateVar = DoubleVar()
self._estimateVar.set(1.0)
self._estimateEntry = Label(self, textvariable = self._estimateVar)
self._estimateEntry.grid(row = 1, column = 1)
#Button that computes the input
self._estimateButton = Button(self, text = "Estimate", command = self._newtonSquare)
self._estimateButton.grid(row = 4, column = 0)
#Button that resets text boxes
self._resetButton = Button(self, text = "Reset", command = self._reset)
self._resetButton.grid(row = 4, column = 1)
def _newtonSquare(self):
value = self._inputVar.get()
estimate = self._estimateVar.get()
tolerance = 0.000001
if value <= 0.0:
self._estimateVar.set(0.0)
else:
estimate = (estimate + value / estimate) / 2
difference = abs(value - estimate **2)
if difference <= tolerance:
self._estimateVar.set(estimate)
self._estimateButton.config(state = 'disabled')
else:
self._estimateVar.set(estimate)
def _reset(self):
self._inputVar.set(1.0)
self._estimateVar.set(1.0)
def main():
root = Tk()
newtonGUI(root)
root.mainloop()
main()