我制作的 Python Tkinter 计算器无法正常工作
This Python Tkinter calculator I made isn't working properly
我制作的这个 Tkinter 计算器无法正常工作。
这是它的代码：
from tkinter import *
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
First_number = float(e1.get())
Second_number = float(e2.get())
add = Button(root, text="Add", padx=10, pady=10, command=lambda: add(First_number, Second_number))
add.grid(row=3, column=0)
sub = Button(root, text="Subtract", padx=10, pady=10, command=lambda: sub(First_number, Second_number))
sub.grid(row=3, column=1)
mul = Button(root, text="Multiply", padx=10, pady=10, command=lambda: mul(First_number, Second_number))
mul.grid(row=3, column=2)
div = Button(root, text="Divide", padx=10, pady=10, command=lambda: div(First_number, Second_number))
div.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")
def add(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root.mainloop()
当程序是 运行 时，小部件正确显示并且输入框工作，但是在我输入第一个和第二个数字并单击一个运算（加、减、乘或除）之后答案输入框显示0.0
我该怎么办？
这是因为您在 entry 中输入值之前设置了 First_number 和 Second_number 的值 entry 的默认值是 0，它被设置为 First_number 和 Second_number 值。然后你在所有情况下得到 0，在 division.
中得到 ZeroDivisionError
还有一个建议是你的功能和按钮名称是一样的。这不是一个好习惯。您可以将名称 add 更改为 add_btn，将 sub 更改为 sub_btn 等
这是格式化后的代码。
from tkinter import *
def add():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
add_btn = Button(root, text="Add", padx=10, pady=10, command=add)
add_btn.grid(row=3, column=0)
sub_btn = Button(root, text="Subtract", padx=10, pady=10, command=sub)
sub_btn.grid(row=3, column=1)
mul_btn = Button(root, text="Multiply", padx=10, pady=10, command=mul)
mul_btn.grid(row=3, column=2)
div_btn = Button(root, text="Divide", padx=10, pady=10, command=div)
div_btn.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")
root.mainloop()
另一种方法是使用 global。我建议你使用上面的案例，因为使用 global 关键字不是一个好的做法。
from tkinter import *
First_number = 0
Second_number = 0
def first_second():
global First_number,Second_number
First_number = float(e1.get())
Second_number = float(e2.get())
def add():
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub():
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul():
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div():
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
add_btn = Button(root, text="Add", padx=10, pady=10, command=lambda :[first_second(),add()])
add_btn.grid(row=3, column=0)
sub_btn = Button(root, text="Subtract", padx=10, pady=10, command=lambda :[first_second(),sub()])
sub_btn.grid(row=3, column=1)
mul_btn = Button(root, text="Multiply", padx=10, pady=10, command=lambda :[first_second(),mul()])
mul_btn.grid(row=3, column=2)
div_btn = Button(root, text="Divide", padx=10, pady=10, command=lambda :[first_second(),div()])
div_btn.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")
我制作的这个 Tkinter 计算器无法正常工作。
这是它的代码：
from tkinter import *
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
First_number = float(e1.get())
Second_number = float(e2.get())
add = Button(root, text="Add", padx=10, pady=10, command=lambda: add(First_number, Second_number))
add.grid(row=3, column=0)
sub = Button(root, text="Subtract", padx=10, pady=10, command=lambda: sub(First_number, Second_number))
sub.grid(row=3, column=1)
mul = Button(root, text="Multiply", padx=10, pady=10, command=lambda: mul(First_number, Second_number))
mul.grid(row=3, column=2)
div = Button(root, text="Divide", padx=10, pady=10, command=lambda: div(First_number, Second_number))
div.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")
def add(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div(First_number, Second_number):
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root.mainloop()
当程序是 运行 时，小部件正确显示并且输入框工作，但是在我输入第一个和第二个数字并单击一个运算（加、减、乘或除）之后答案输入框显示0.0
我该怎么办？
这是因为您在 entry 中输入值之前设置了 First_number 和 Second_number 的值 entry 的默认值是 0，它被设置为 First_number 和 Second_number 值。然后你在所有情况下得到 0，在 division.
ZeroDivisionError
还有一个建议是你的功能和按钮名称是一样的。这不是一个好习惯。您可以将名称 add 更改为 add_btn，将 sub 更改为 sub_btn 等
这是格式化后的代码。
from tkinter import *
def add():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div():
First_number = float(e1.get())
Second_number = float(e2.get())
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
add_btn = Button(root, text="Add", padx=10, pady=10, command=add)
add_btn.grid(row=3, column=0)
sub_btn = Button(root, text="Subtract", padx=10, pady=10, command=sub)
sub_btn.grid(row=3, column=1)
mul_btn = Button(root, text="Multiply", padx=10, pady=10, command=mul)
mul_btn.grid(row=3, column=2)
div_btn = Button(root, text="Divide", padx=10, pady=10, command=div)
div_btn.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")
root.mainloop()
另一种方法是使用 global。我建议你使用上面的案例，因为使用 global 关键字不是一个好的做法。
from tkinter import *
First_number = 0
Second_number = 0
def first_second():
global First_number,Second_number
First_number = float(e1.get())
Second_number = float(e2.get())
def add():
e3.delete(0, END)
e3.insert(0, First_number + Second_number)
def sub():
e3.delete(0, END)
e3.insert(0, First_number - Second_number)
def mul():
e3.delete(0, END)
e3.insert(0, First_number * Second_number)
def div():
e3.delete(0, END)
e3.insert(0, First_number / Second_number)
root = Tk()
root.geometry("350x200")
root.title("Calculator")
e1 = Entry(root, width=35, borderwidth=5)
e1.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
e1.insert(0, "0")
e2 = Entry(root, width=35, borderwidth=5)
e2.grid(row=1, column=0, columnspan=3, padx=10, pady=10)
e2.insert(0, "0")
add_btn = Button(root, text="Add", padx=10, pady=10, command=lambda :[first_second(),add()])
add_btn.grid(row=3, column=0)
sub_btn = Button(root, text="Subtract", padx=10, pady=10, command=lambda :[first_second(),sub()])
sub_btn.grid(row=3, column=1)
mul_btn = Button(root, text="Multiply", padx=10, pady=10, command=lambda :[first_second(),mul()])
mul_btn.grid(row=3, column=2)
div_btn = Button(root, text="Divide", padx=10, pady=10, command=lambda :[first_second(),div()])
div_btn.grid(row=3, column=3)
e3 = Entry(root, width=35, borderwidth=5, font=("Arial", 10))
e3.grid(row=4, column=0, columnspan=3, padx=10, pady=20)
e3.insert(0, "0")