大家好我是相对编程的新手，但我尝试使用GUI界面来构建小费计算器。什么都不大，没什么比较难的，但我遇到了错误。由于某种原因，我的Python不会显示错误。它只是转到shell，SyntaxError说：然后退回到脚本。它曾经显示错误，但我不知道什么是错的...反正如果你们可以帮助我排除故障这个id非常感谢..
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# A tip calculator
# A tip calculator using a GUI interface
# Austin Howard Aug - 13 - 2014
from tkinter import *
#Creating buttons.
class Calculator(Frame):
""" A GUI tip calculator."""
def __init__(self, master):
Frame.__init__(self, master)
self.grid()
self.creating_buttons()
def creating_buttons(self):
"""This list includes Entry fields, which the user will use to define
several objects such as Bill, and how many people are paying on that bill."""
#Create an entry field button for how much the bill total is.
#Create a label
bill_lbl = Label(self,
text = "Bill: ")
bill_lbl.grid(row = 1,
column = 0,
columnspan = 1,
sticky = W)
#Create an Entry field.
bill_ent = Entry(self)
bill_ent.grid(row = 1,
column = 1,
sticky = W)
#Create a Button for how many people will be paying on the bill
#Create label
people_paying_lbl = Label(self,
text = "How many people are paying on this bill?: ")
people_paying_lbl.grid(row = 2,
column = 0,
columnspan = 1,
sticky = W)
#Create an entry field
people_paying_ent = Entry(self)
people_paying_ent.grid(row = 2,
column = 1,
sticky = W)
#Create a text box to display the totals in
bill_total_txt = Text(self,
width = 40,
height = 40,
wrap = WORD)
bill_total_txt.grid(row = 3,
column = 0,
columnspan = 2,
sticky = W)
#Create a Submit button
submit = Button(self,
text = "Submit",
command = self.total)
submit.grid(row = 4,
column = 0,
sticky = W)
def total(self):
""" Takes the values from Bill, and # of people to get the amount that will be
displayed in the text box."""
TAX = .15
bill = float(bill_ent)
people = people_paying_ent
Total = ("The tip is: $", TAX * bill, "\nThe total for the bill is: $",
TAX * bill + bill,
"divided among the people paying equally is: $",
TAX * bill + bill / people "per, person.")
bill_total_txt.delete(0.0, END)
bill_total_txt.insert(0.0, Total)
#Starting the Program
root = Tk()
root.title("Tip Calculator")
app = Calculator(root)
root.mainloop()
`
答案 0 :(得分：1)
第68行有错误：
替换
TAX * bill + bill / people "per, person.")
与
TAX * bill + bill / people, "per, person.")
还要确保在root.mainloop()
答案 1 :(得分：0)
从条目框中获取输入的方式是错误的。您应该将StringVariable绑定到它们，以便稍后能够获取用户键入的内容：
self.billvar = StringVar()
bill_ent = Entry(self, textvariable = self.billvar)
和人数一样的盒子。
然后在total函数中，您可以使用self.billvar.get()读取值。您可以使用float(self.billvar.get())将其转换为浮点数。但是，如果失败（用户输入的内容无法转换为浮点数），您可能想告诉他们而不是让程序抛出错误。所以你应该使用类似的东西：
try:
convert input
except:
what to do if it fails, tell the user?
else:
what to do if it did not fail, so do the calculations
你的程序就变成了这样的东西（我用##做了评论）：
# A tip calculator
# A tip calculator using a GUI interface
# Austin Howard Aug - 13 - 2014
from tkinter import *
#Creating buttons.
class Calculator(Frame):
""" A GUI tip calculator."""
def __init__(self, master):
Frame.__init__(self, master)
self.grid()
self.creating_buttons()
def creating_buttons(self):
"""This list includes Entry fields, which the user will use to define
several objects such as Bill, and how many people are paying on that bill."""
#Create an entry field button for how much the bill total is.
#Create a label
bill_lbl = Label(self,
text = "Bill: ")
bill_lbl.grid(row = 1,
column = 0,
columnspan = 1,
sticky = W)
#Create an Entry field.
## Create a StringVar and link it to the entry box
self.billvar = StringVar()
bill_ent = Entry(self, textvariable = self.billvar)
bill_ent.grid(row = 1,
column = 1,
sticky = W)
#Create a Button for how many people will be paying on the bill
#Create label
people_paying_lbl = Label(self,
text = "How many people are paying on this bill?: ")
people_paying_lbl.grid(row = 2,
column = 0,
columnspan = 1,
sticky = W)
#Create an entry field
## Create a StringVar and link it to the entry box
self.pplvar = StringVar()
people_paying_ent = Entry(self, textvariable = self.pplvar)
people_paying_ent.grid(row = 2,
column = 1,
sticky = W)
#Create a text box to display the totals in
## This had to be self.bill_total_txt, to be able to put text in it from the total function
self.bill_total_txt = Text(self,
height = 10,
width = 40,
wrap = WORD)
self.bill_total_txt.grid(row = 3,
column = 0,
columnspan = 2,
sticky = W)
#Create a Submit button
submit = Button(self,
text = "Submit",
command = self.total)
submit.grid(row = 4,
column = 0,
sticky = W)
def total(self):
""" Takes the values from Bill, and # of people to get the amount that will be
displayed in the text box."""
TAX = .15
## Try to convert the bill to a float and the number of people to an integer
try:
bill = float(self.billvar.get())
people = int(self.pplvar.get())
## If something goes wrong tell the user the input is invalid
except:
self.bill_total_txt.delete(0.0, END)
self.bill_total_txt.insert(0.0, 'Invalid input')
## If the conversion was possible, calculate the tip, the total amount and the amout per person and format them as a string with two decimals
## Then create the complete message as a list and join it togeather when writing it to the textbox
else:
tip = "%.2f" % (TAX * bill)
tot = "%.2f" % (TAX * bill + bill)
tot_pp = "%.2f" % ((TAX * bill + bill) / people)
Total = ["The tip is: $", tip,
"\nThe total for the bill is: $",
tot,
" divided among the people paying equally is: $",
tot_pp,
" per person."]
self.bill_total_txt.delete(0.0, END)
self.bill_total_txt.insert(0.0, ''.join(Total))
#Starting the Program
root = Tk()
root.title("Tip Calculator")
app = Calculator(root)
root.mainloop()