我是一名全日制学生，正在上我的第一堂python课。这太奇怪了，它本来是可以工作的，现在，它不再显示按钮、标签和输入字段了。我确定这是我删除或添加的东西，但是，我很困惑。什么好主意吗?如有任何建议，欢迎提出。
from Tkinter import *
import tkFont
import tkMessageBox
class BouncyGUI(Frame):
"""The GUI used to interface with the bouncy calculation from chapter 9 section 1."""
def __init__(self):
Frame.__init__(self)
# Establish the Base Frame
self.master.title("Calculate the Bounciness of a Ball")
self.master.rowconfigure(0, weight = 1)
self.master.columnconfigure(0, weight = 1)
self.master.grid()
self.master.resizable(0,0)
# Establish the components for capturing the Height
self._heightLabel = Label(self,
text = "Height of initial drop:",
justify = "left")
self._heightLabel.grid(row = 0, column = 0)
self._heightVar = DoubleVar()
self._heightEntry = Entry(self,
textvariable = self._heightVar,
justify = "center")
self._heightEntry.grid(row = 0, column = 1)
# Establish the "bounciness index"
self._bouncyIndex = Label(self,
text = "Bounciness Index:",
justify = "left")
self._bouncyIndex.grid(row = 1, column = 0)
self._bouncyVar = DoubleVar()
self._bouncyEntry = Entry(self,
textvariable = self._bouncyVar,
justify = "center")
self._bouncyEntry.grid(row = 1, column = 1)
self._bouncyVar.set(0.6)
# Establish number of allowable bounces
self._numberBounces = Label(self,
text = "Number of Bounces:",
justify = "left")
self._numberBounces.grid(row = 2, column = 0)
self._numberBouncesVar = IntVar()
self._numberBouncesEntry = Entry(self,
textvariable = self._numberBouncesVar,
justify = "center")
self._numberBouncesEntry.grid(row = 2, column = 1)
# Establish a field for the response
self._answer = Label(self,
text = "Distance Travelled",
justify = "left")
self._answer.grid(row = 3, column = 0)
self._answerVar = DoubleVar()
self._answerFont = tkFont.Font(weight="bold", size = 12)
self._answerEntry = Entry(self,
textvariable = self._answerVar,
justify = "center",
font = self._answerFont)
self._answerEntry.grid(row = 3, column = 1)
self._answerEntry.config(state = DISABLED, bg = "green")
# Create frame to hold buttons
self._buttonFrame = Frame(self)
self._buttonFrame.grid(row = 4, column = 0, columnspan = 2)
# Create Reset Button
self._buttonReset = Button(self._buttonFrame,
text = "Reset",
command = self._reset,
width = 15,
padx = 2,
pady = 2)
self._buttonReset.grid(row = 0, column = 0)
#self._buttonReset.config(state = DISABLED)
# Create Calculate Button
self._buttonCalc = Button(self._buttonFrame,
text = "Calculate",
command = self._calculate,
width = 15,
padx = 2,
pady = 2)
self._buttonCalc.grid(row = 0, column = 1)
#self._buttonCalc.config(state = NORMAL)
def _reset(self):
"""Allow for the screen to reset for fresh data entry."""
self._heightVar.set(0.0)
self._numberBouncesVar.set(0)
self._answerVar.set(0.0)
#self._buttonCalc.config(state = NORMAL)
#self._buttonReset.config(state = DISABLED)
#self._numberBouncesEntry.config(state = NORMAL)
#self._bouncyEntry.config(state = NORMAL)
#self._heightEntry.config(state = NORMAL)
def _calculate(self):
"""Calculate the bounciness and update the GUI"""
if self._validDataTypes():
self._answerVar.set(computeDistance(self._heightVar.get(),
self._bouncyVar.get(),
self._numberBouncesVar.get()))
#self._numberBouncesEntry.config(state = DISABLED)
#self._bouncyEntry.config(state = DISABLED)
#self._heightEntry.config(state = DISABLED)
#self._buttonCalc.config(state = DISABLED)
#self._buttonReset.config(state = NORMAL)
def _validDataTypes(self):
theMessage = ""
if self._isInt(self._numberBouncesVar.get()) != True:
theMessage += "Please re-enter Integer Value for Number of Bounces.n"
elif self._isFloat(self._bouncyVar.get()) != True:
theMessage += "Please re-enter Float Value for Bounciness Index.n"
elif self._isFloat(self._heightVar.get()) != True:
theMessage += "Please re-enter Float Value for Initial Height."
if len(message) > 0:
tkMessageBox.showerror(message = message, parent = self)
return False
else:
return True
def _isInt(self, value):
# Test to ensure that value entered is an integer
try:
x = int(value)
except ValueError:
# If not return false
return False
# if it is an integer, return true
return True
def _isFloat(self, value):
# Test to ensure that value entered is a float value
try:
x = float(value)
except ValueError:
# If not return false
return False
# If it is a float, return true
return True
def computeDistance(height, index, bounces):
"""Compute the distance travelled."""
total = 0
for x in range(bounces):
total += height
height *= index
total += height
return total
def main():
"""Run the main program"""
BouncyGUI().mainloop()
main()
您的main()函数设置代码不能正常工作。我不知道你以前是怎么设置它的，但是让它工作的一种方法是:
def main():
"""Run the main program"""
root = Tk()
gui = BouncyGUI()
gui.pack()
root.mainloop()
你需要网格化主应用程序，而不仅仅是调用它的主循环:
def main()
app = BouncyGUI()
app.grid()
app.mainloop()
您的代码在编译时出现错误:
NameError: global name 'message' is not defined