为什么图像不显示在 tkinter 中使用 if 条件？
Why is the image not showing in the tkinter using if conditions?
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
win=tkinter.Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
def code():
btn1.destroy()
add=StringVar()
sub=StringVar()
pro=StringVar()
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper2, image=img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
def Find():
add.set(float(ent00.get())+float(ent01.get()))
sub.set(float(ent00.get())-float(ent01.get()))
pro.set(float(ent00.get())*float(ent01.get()))
ent00=Entry(wrapper, width=15)
ent00.grid(row=4, column=1, padx=10, pady=10, sticky='w')
ent01=Entry(wrapper, width=15)
ent01.grid(row=5, column=1, padx=10, pady=10, sticky='w')
lbl8=Label(wrapper, text="Add", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=6, column=0, padx=20, pady=10, sticky='w')
ent8=Entry(wrapper, textvariable=add, width=15, state='readonly')
ent8.grid(row=6, column=1, padx=10, pady=10, sticky='w')
lbl15=Label(wrapper, text="Subtract", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=7, column=0, padx=20, pady=10, sticky='w')
ent15=Entry(wrapper, textvariable=sub, width=15, state='readonly')
ent15.grid(row=7, column=1, padx=10, pady=10, sticky='w')
lbl9=Label(wrapper, text="Product", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=8, column=0, padx=20, pady=10, sticky='w')
ent9=Entry(wrapper, textvariable=pro, width=15, state='readonly')
ent9.grid(row=8, column=1, padx=10, pady=10, sticky='w')
btn = Button(wrapper, text = 'Calculate', command=Find, bd = '5', width=15, height=2)
btn.grid(row=11, column=1, padx=20, pady=10)
def img():
if ent8.get()=="4":
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper3, image=img)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
btn2 = Button(wrapper, text = 'Image', command=img, bd = '5', width=15, height=2)
btn2.grid(row=12, column=1, padx=20, pady=10)
btn1 = Button(wrapper, text = 'OPEN CODE', command=code, bd = '5', width=20, height=2)
btn1.grid(row=11, column=1, padx=20, pady=10)
win.geometry("1400x700+250+250")
win.mainloop()
需要在 tkinter 上显示两张图片。之前在 wrapper2 中定义的那个显示空帧，而在得到 4 作为总和后必须出现在 wrapper3 中的那个根本不出现。此外，打印的输出是“再试一次”。为什么会这样？当总和为 4 时，它必须显示“向前移动”。
首先，糟糕的名字。
您的函数和 PhotoImage 都被命名为 img。将函数重命名为 def add_img()。
其次，查看您的代码，我不知道所有包装框架的用途是什么，为什么不根据计划容纳的内容来命名它们呢？这同样适用于所有小部件。 calc_btn 不是比 btn 更好的名字吗？ img_btn 而不是 btn2？为什么你需要阅读更多的东西而不是名字才能知道什么是什么？
第三，你的代码中有两次ent8。一次作为 Label，一次作为 StringVar。
Tkinter 不断刷新您的 window 因此您需要保存您正在使用的图像。
就个人而言，我会在 class.
中完成所有这些
现在，使用您当前的代码，只需添加
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg")) 在你的函数之前而不是使用你用来打开图像的变量，只需使用 Label(wrapper3, image=loaded_img)
如：
win = Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
编辑
这是完整的代码：
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
win=Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
add_strvar = StringVar()
sub_strvar = StringVar()
pro_strvar = StringVar()
def code():
btn1.destroy()
Label2= Label(wrapper2, image=loaded_img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
def Find():
add_strvar.set(float(ent00.get())+float(ent01.get()))
sub_strvar.set(float(ent00.get())-float(ent01.get()))
pro_strvar.set(float(ent00.get())*float(ent01.get()))
ent00=Entry(wrapper, width=15)
ent00.grid(row=4, column=1, padx=10, pady=10, sticky='w')
ent01=Entry(wrapper, width=15)
ent01.grid(row=5, column=1, padx=10, pady=10, sticky='w')
lbl8=Label(wrapper, text="Add", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=6, column=0, padx=20, pady=10, sticky='w')
ent8=Entry(wrapper, textvariable=add_strvar, width=15, state='readonly')
ent8.grid(row=6, column=1, padx=10, pady=10, sticky='w')
lbl15=Label(wrapper, text="Subtract", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=7, column=0, padx=20, pady=10, sticky='w')
ent15=Entry(wrapper, textvariable=sub_strvar, width=15, state='readonly')
ent15.grid(row=7, column=1, padx=10, pady=10, sticky='w')
lbl9=Label(wrapper, text="Product", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=8, column=0, padx=20, pady=10, sticky='w')
ent9=Entry(wrapper, textvariable=pro_strvar, width=15, state='readonly')
ent9.grid(row=8, column=1, padx=10, pady=10, sticky='w')
btn = Button(wrapper, text = 'Calculate', command=Find, bd = '5', width=15, height=2)
btn.grid(row=11, column=1, padx=20, pady=10)
def add_img():
if add_strvar.get() == "4.0":
Label2= Label(wrapper3, image=loaded_img)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
btn2 = Button(wrapper, text = 'Image', command=add_img, bd = '5', width=15, height=2)
btn2.grid(row=12, column=1, padx=20, pady=10)
btn1 = Button(wrapper, text = 'OPEN CODE', command=code, bd = '5', width=20, height=2)
btn1.grid(row=11, column=1, padx=20, pady=10)
win.geometry("1400x700+250+250")
win.mainloop()
编辑 2
代码更改为使用 classes:
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
class ImageCalculator:
def __init__(self, img_path):
self.window = Toplevel()
self.window.geometry("1400x700+250+250")
self.mainframe = Frame(self.window)
self.mainframe.pack(expand=True, fill=BOTH)
self.bg_color = 'crimson'
frame_settings = {'master': self.mainframe, 'bd': 4,
'relief': RIDGE, 'bg': self.bg_color}
frame_names = ('left', 'center', 'right')
self.frames = {name: Frame(**frame_settings) for name in frame_names}
frame_height = 625
init_y = 80
frame_widths = {'left': 465, 'center': 485, 'right': 465}
x = 0
for name in frame_names:
frame_width = frame_widths[name]
self.frames[name].place(x=x, y=init_y, width=frame_width,
height=frame_height)
x += frame_width
self.setup_right_wrapper()
self.code_btn = self.setup_left_wrapper()
self.loaded_image = ImageTk.PhotoImage(Image.open(img_path))
self.add_strvar = StringVar()
self.sub_strvar = StringVar()
self.pro_strvar = StringVar()
def setup_left_wrapper(self) -> Button:
code_btn = Button(self.frames['left'], text='OPEN CODE', command=self.code,
bd='5', width=20, height=2)
img_btn = Button(self.frames['left'], text='Image', bd='5', width=15,
height=2, command=self.add_img)
code_btn.grid(row=11, column=1, padx=20, pady=10)
img_btn.grid(row=12, column=1, padx=20, pady=10)
return code_btn
def setup_right_wrapper(self):
right_frame_title = Label(self.frames['right'], text="Selected Data",
bg=self.bg_color, fg="white",
font=("times new roman",30,"bold"))
right_frame_title.grid(row=0, column=0, padx=20, pady=10)
def code(self):
def Find():
self.add_strvar.set(float(first_entry.get())
+ float(second_entry.get()))
self.sub_strvar.set(float(first_entry.get())
- float(second_entry.get()))
self.pro_strvar.set(float(first_entry.get())
* float(second_entry.get()))
self.code_btn.destroy()
Label2 = Label(self.frames['center'], image=self.loaded_image)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
left_frame = self.frames['left']
first_entry = Entry(left_frame, width=15)
second_entry = Entry(left_frame, width=15)
# Settings of all labels
lbl_settings = {'bg': self.bg_color, 'fg': 'white',
'font': ("times new roman", 15, "bold")}
# Setting of all entry.
entry_settings = {'width': 15, 'state': 'readonly'}
add_lbl = Label(left_frame, text="Add", **lbl_settings)
add_entry = Entry(left_frame, textvariable=self.add_strvar,
**entry_settings)
sub_lbl = Label(left_frame, text="Subtract", **lbl_settings)
sub_entry = Entry(left_frame, textvariable=self.sub_strvar,
**entry_settings)
pro_lbl = Label(left_frame, text="Product", **lbl_settings)
pro_entry = Entry(left_frame, textvariable=self.pro_strvar,
**entry_settings)
calc_btn = Button(left_frame, text='Calculate', command=Find, bd='5',
width=15, height=2)
# Widget placement.
first_entry.grid(row=4, column=1, padx=10, pady=10, sticky='w')
second_entry.grid(row=5, column=1, padx=10, pady=10, sticky='w')
add_lbl.grid(row=6, column=0, padx=20, pady=10, sticky='w')
add_entry.grid(row=6, column=1, padx=10, pady=10, sticky='w')
sub_lbl.grid(row=7, column=0, padx=20, pady=10, sticky='w')
sub_entry.grid(row=7, column=1, padx=10, pady=10, sticky='w')
pro_lbl.grid(row=8, column=0, padx=20, pady=10, sticky='w')
pro_entry.grid(row=8, column=1, padx=10, pady=10, sticky='w')
calc_btn.grid(row=11, column=1, padx=20, pady=10)
def add_img(self):
if self.add_strvar.get() == "4.0":
Label2 = Label(self.frames['right'], image=self.loaded_image)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
def main():
img_calc = ImageCalculator('Amritsar.jpg')
mainloop()
if __name__ == "__main__":
main()
为标签设置图片后，您需要保留对该图片的引用。否则，它会在函数末尾被删除，并且您会丢失图像（已被垃圾回收）。
因此，当您定义标签时，只需添加一行将图像存储为标签的属性即可：
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper2, image=img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
Label2.dontloseit = img
Label2 小部件现在有一个名为 .dontloseit 的无意义属性，用于保存图像。现在，它不会被收集，它会显示在你的 tkinter 小部件中。
这是 tkinter 的特点之一。
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
win=tkinter.Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
def code():
btn1.destroy()
add=StringVar()
sub=StringVar()
pro=StringVar()
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper2, image=img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
def Find():
add.set(float(ent00.get())+float(ent01.get()))
sub.set(float(ent00.get())-float(ent01.get()))
pro.set(float(ent00.get())*float(ent01.get()))
ent00=Entry(wrapper, width=15)
ent00.grid(row=4, column=1, padx=10, pady=10, sticky='w')
ent01=Entry(wrapper, width=15)
ent01.grid(row=5, column=1, padx=10, pady=10, sticky='w')
lbl8=Label(wrapper, text="Add", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=6, column=0, padx=20, pady=10, sticky='w')
ent8=Entry(wrapper, textvariable=add, width=15, state='readonly')
ent8.grid(row=6, column=1, padx=10, pady=10, sticky='w')
lbl15=Label(wrapper, text="Subtract", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=7, column=0, padx=20, pady=10, sticky='w')
ent15=Entry(wrapper, textvariable=sub, width=15, state='readonly')
ent15.grid(row=7, column=1, padx=10, pady=10, sticky='w')
lbl9=Label(wrapper, text="Product", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=8, column=0, padx=20, pady=10, sticky='w')
ent9=Entry(wrapper, textvariable=pro, width=15, state='readonly')
ent9.grid(row=8, column=1, padx=10, pady=10, sticky='w')
btn = Button(wrapper, text = 'Calculate', command=Find, bd = '5', width=15, height=2)
btn.grid(row=11, column=1, padx=20, pady=10)
def img():
if ent8.get()=="4":
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper3, image=img)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
btn2 = Button(wrapper, text = 'Image', command=img, bd = '5', width=15, height=2)
btn2.grid(row=12, column=1, padx=20, pady=10)
btn1 = Button(wrapper, text = 'OPEN CODE', command=code, bd = '5', width=20, height=2)
btn1.grid(row=11, column=1, padx=20, pady=10)
win.geometry("1400x700+250+250")
win.mainloop()
需要在 tkinter 上显示两张图片。之前在 wrapper2 中定义的那个显示空帧，而在得到 4 作为总和后必须出现在 wrapper3 中的那个根本不出现。此外，打印的输出是“再试一次”。为什么会这样？当总和为 4 时，它必须显示“向前移动”。
首先，糟糕的名字。
您的函数和 PhotoImage 都被命名为 img。将函数重命名为 def add_img()。
其次，查看您的代码，我不知道所有包装框架的用途是什么，为什么不根据计划容纳的内容来命名它们呢？这同样适用于所有小部件。 calc_btn 不是比 btn 更好的名字吗？ img_btn 而不是 btn2？为什么你需要阅读更多的东西而不是名字才能知道什么是什么？
第三，你的代码中有两次ent8。一次作为 Label，一次作为 StringVar。
Tkinter 不断刷新您的 window 因此您需要保存您正在使用的图像。
就个人而言，我会在 class.
现在，使用您当前的代码，只需添加
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg")) 在你的函数之前而不是使用你用来打开图像的变量，只需使用 Label(wrapper3, image=loaded_img)
如：
win = Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
编辑
这是完整的代码：
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
win=Toplevel()
wrapper=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper.place(x=0, y=80, width=465, height=625)
wrapper3=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper3.place(x=950, y=80, width=465, height=625)
wrapper3_title=Label(wrapper3, text="Selected Data", bg="crimson", fg="white", font=("times new roman",30,"bold"))
wrapper3_title.grid(row=0,column=0,padx=20, pady=10)
wrapper2=Frame(win, bd=4, relief=RIDGE, bg="crimson")
wrapper2.place(x=465, y=80, width=485, height=625)
ent8=StringVar()
loaded_img = ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
add_strvar = StringVar()
sub_strvar = StringVar()
pro_strvar = StringVar()
def code():
btn1.destroy()
Label2= Label(wrapper2, image=loaded_img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
def Find():
add_strvar.set(float(ent00.get())+float(ent01.get()))
sub_strvar.set(float(ent00.get())-float(ent01.get()))
pro_strvar.set(float(ent00.get())*float(ent01.get()))
ent00=Entry(wrapper, width=15)
ent00.grid(row=4, column=1, padx=10, pady=10, sticky='w')
ent01=Entry(wrapper, width=15)
ent01.grid(row=5, column=1, padx=10, pady=10, sticky='w')
lbl8=Label(wrapper, text="Add", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=6, column=0, padx=20, pady=10, sticky='w')
ent8=Entry(wrapper, textvariable=add_strvar, width=15, state='readonly')
ent8.grid(row=6, column=1, padx=10, pady=10, sticky='w')
lbl15=Label(wrapper, text="Subtract", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=7, column=0, padx=20, pady=10, sticky='w')
ent15=Entry(wrapper, textvariable=sub_strvar, width=15, state='readonly')
ent15.grid(row=7, column=1, padx=10, pady=10, sticky='w')
lbl9=Label(wrapper, text="Product", bg="crimson", fg="white", font=("times new roman",15,"bold")).grid(row=8, column=0, padx=20, pady=10, sticky='w')
ent9=Entry(wrapper, textvariable=pro_strvar, width=15, state='readonly')
ent9.grid(row=8, column=1, padx=10, pady=10, sticky='w')
btn = Button(wrapper, text = 'Calculate', command=Find, bd = '5', width=15, height=2)
btn.grid(row=11, column=1, padx=20, pady=10)
def add_img():
if add_strvar.get() == "4.0":
Label2= Label(wrapper3, image=loaded_img)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
btn2 = Button(wrapper, text = 'Image', command=add_img, bd = '5', width=15, height=2)
btn2.grid(row=12, column=1, padx=20, pady=10)
btn1 = Button(wrapper, text = 'OPEN CODE', command=code, bd = '5', width=20, height=2)
btn1.grid(row=11, column=1, padx=20, pady=10)
win.geometry("1400x700+250+250")
win.mainloop()
编辑 2
代码更改为使用 classes:
from tkinter import *
from tkinter import ttk
from PIL import ImageTk ,Image
class ImageCalculator:
def __init__(self, img_path):
self.window = Toplevel()
self.window.geometry("1400x700+250+250")
self.mainframe = Frame(self.window)
self.mainframe.pack(expand=True, fill=BOTH)
self.bg_color = 'crimson'
frame_settings = {'master': self.mainframe, 'bd': 4,
'relief': RIDGE, 'bg': self.bg_color}
frame_names = ('left', 'center', 'right')
self.frames = {name: Frame(**frame_settings) for name in frame_names}
frame_height = 625
init_y = 80
frame_widths = {'left': 465, 'center': 485, 'right': 465}
x = 0
for name in frame_names:
frame_width = frame_widths[name]
self.frames[name].place(x=x, y=init_y, width=frame_width,
height=frame_height)
x += frame_width
self.setup_right_wrapper()
self.code_btn = self.setup_left_wrapper()
self.loaded_image = ImageTk.PhotoImage(Image.open(img_path))
self.add_strvar = StringVar()
self.sub_strvar = StringVar()
self.pro_strvar = StringVar()
def setup_left_wrapper(self) -> Button:
code_btn = Button(self.frames['left'], text='OPEN CODE', command=self.code,
bd='5', width=20, height=2)
img_btn = Button(self.frames['left'], text='Image', bd='5', width=15,
height=2, command=self.add_img)
code_btn.grid(row=11, column=1, padx=20, pady=10)
img_btn.grid(row=12, column=1, padx=20, pady=10)
return code_btn
def setup_right_wrapper(self):
right_frame_title = Label(self.frames['right'], text="Selected Data",
bg=self.bg_color, fg="white",
font=("times new roman",30,"bold"))
right_frame_title.grid(row=0, column=0, padx=20, pady=10)
def code(self):
def Find():
self.add_strvar.set(float(first_entry.get())
+ float(second_entry.get()))
self.sub_strvar.set(float(first_entry.get())
- float(second_entry.get()))
self.pro_strvar.set(float(first_entry.get())
* float(second_entry.get()))
self.code_btn.destroy()
Label2 = Label(self.frames['center'], image=self.loaded_image)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
left_frame = self.frames['left']
first_entry = Entry(left_frame, width=15)
second_entry = Entry(left_frame, width=15)
# Settings of all labels
lbl_settings = {'bg': self.bg_color, 'fg': 'white',
'font': ("times new roman", 15, "bold")}
# Setting of all entry.
entry_settings = {'width': 15, 'state': 'readonly'}
add_lbl = Label(left_frame, text="Add", **lbl_settings)
add_entry = Entry(left_frame, textvariable=self.add_strvar,
**entry_settings)
sub_lbl = Label(left_frame, text="Subtract", **lbl_settings)
sub_entry = Entry(left_frame, textvariable=self.sub_strvar,
**entry_settings)
pro_lbl = Label(left_frame, text="Product", **lbl_settings)
pro_entry = Entry(left_frame, textvariable=self.pro_strvar,
**entry_settings)
calc_btn = Button(left_frame, text='Calculate', command=Find, bd='5',
width=15, height=2)
# Widget placement.
first_entry.grid(row=4, column=1, padx=10, pady=10, sticky='w')
second_entry.grid(row=5, column=1, padx=10, pady=10, sticky='w')
add_lbl.grid(row=6, column=0, padx=20, pady=10, sticky='w')
add_entry.grid(row=6, column=1, padx=10, pady=10, sticky='w')
sub_lbl.grid(row=7, column=0, padx=20, pady=10, sticky='w')
sub_entry.grid(row=7, column=1, padx=10, pady=10, sticky='w')
pro_lbl.grid(row=8, column=0, padx=20, pady=10, sticky='w')
pro_entry.grid(row=8, column=1, padx=10, pady=10, sticky='w')
calc_btn.grid(row=11, column=1, padx=20, pady=10)
def add_img(self):
if self.add_strvar.get() == "4.0":
Label2 = Label(self.frames['right'], image=self.loaded_image)
Label2.grid(row=0, column=2, padx=10, pady=5, sticky='w')
print("Move ahead")
else:
print("Try again")
def main():
img_calc = ImageCalculator('Amritsar.jpg')
mainloop()
if __name__ == "__main__":
main()
为标签设置图片后，您需要保留对该图片的引用。否则，它会在函数末尾被删除，并且您会丢失图像（已被垃圾回收）。
因此，当您定义标签时，只需添加一行将图像存储为标签的属性即可：
img=ImageTk.PhotoImage(Image.open("Amritsar.jpg"))
Label2= Label(wrapper2, image=img)
Label2.grid(row=0, column=0, padx=10, pady=5, sticky='w')
Label2.dontloseit = img
Label2 小部件现在有一个名为 .dontloseit 的无意义属性，用于保存图像。现在，它不会被收集，它会显示在你的 tkinter 小部件中。
这是 tkinter 的特点之一。