Entry.delete 在 Tkinter 中未清除
Entry.delete in Tkinter not clearing
我尝试制作一个简单的数字检查器来显示数字是否正确。
在草草写了一些原型代码后，我无法清除字段。
我研究了有关此主题的许多问题，但找不到答案。
我的尝试是 show_result()
我做错了什么？
它应该接受数字，并且是最后一个数字；核实。如果正确，则显示接受图像，否则显示拒绝图像并在输入错误后清除条目。 3 秒后删除图像。
我怀疑 num_limit() 函数搞砸了，但我不知道是什么。
所有其他文件都可以在这里找到：https://bytebitten.stackstorage.com/s/JeRD33P92Us4a1Li
from tkinter import *
import time
#####
# Variables
code_check = 0
codeLength = 4
list3 = 123, 456
list4 = 2345, 3452
#####
# System
root = Tk()
root.title('Code Verifier')
root.attributes('-fullscreen', True)
root.bind('<Escape>',lambda e: root.quit())
#####
# Functions
# Input limiter function (WIP)
def num_limit(p, this_field):
global codeLength
print("Entry" + this_field + ": " + p)
this_field = int(this_field)
entries = [entry1, entry2, entry3, entry4]
next_field = entries[this_field]
# Check if it's a number
if p.isdigit():
if this_field < codeLength:
# Set focus on next field
next_field.focus_set()
pass
else:
code_checker()
return True
else:
# Check if it's Backspace or del/home/end/PgUp/PgDn
if p!="\x08" and p!="":
return False
else:
if this_field < codeLength:
next_field.focus_set()
else:
return True
def code_checker():
global code_check
global codeLength
print("== Code Check ==")
enteredCode = ''
enteredCode += entry1.get()
enteredCode += entry2.get()
enteredCode += entry3.get()
if codeLength == 3:
if enteredCode in list3:
code_check = 1
else:
code_check = 2
if codeLength == 4:
enteredCode += entry4.get()
if enteredCode in list4:
code_check = 1
else:
code_check = 2
show_result()
def show_result():
global code_check
print("== Show Result ==")
print(code_check)
# If code is correct
if code_check == 1:
# Image code accepted
main_canvas.create_image(width/2, 750, anchor=N, image=codeAccepted)
# If code is wrong
elif code_check == 2:
# Image code denied
main_canvas.create_image(width/2, 750, anchor=N, image=codeDenied)
# Clear fields
entry1.delete(0, END)
entry2.delete(0, END)
entry3.delete(0, END)
entry4.delete(0, END)
# Set focus to first field
entry1.focus_set()
else:
pass
#####
# Screen items
# Load images
codeDenied = PhotoImage(file='Assets/code_denied.png')
codeAccepted = PhotoImage(file='Assets/code_accepted.png')
# Set fullscreen canvas
main_canvas = Canvas(root, bg="#000000", bd=0, highlightthickness=0)
main_canvas.pack(fill="both", expand=True)
width = root.winfo_screenwidth()
height = root.winfo_screenheight()
# Input num limiter command
vcmd = root.register(func=num_limit)
# 3-6 single-digit input fields
entry1 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 1), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry2 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 2), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry3 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 3), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry4 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 4), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
# Entry position adjust
field1 = -100
field2 = 0
field3 = 100
field4 = 150
# Entry placing
if codeLength == 3:
entry_window1 = main_canvas.create_window(width+field1, 500, anchor=N, window=entry1)
entry_window2 = main_canvas.create_window(width+field2, 500, anchor=N, window=entry2)
entry_window3 = main_canvas.create_window(width+field3, 500, anchor=N, window=entry3)
elif codeLength == 4:
field1 = field1-50
field2 = field2-50
field3 = field3-50
entry_window1 = main_canvas.create_window(width/2+field1, 500, anchor=N, window=entry1)
entry_window2 = main_canvas.create_window(width/2+field2, 500, anchor=N, window=entry2)
entry_window3 = main_canvas.create_window(width/2+field3, 500, anchor=N, window=entry3)
entry_window4 = main_canvas.create_window(width/2+field4, 500, anchor=N, window=entry4)
else:
pass
#####
root.mainloop()
在num_limit()里面，要检查Entry的内容是否为空，如果为空return则为真。如果没有此验证，您将无法删除 Entry 的内容，因为空字符串不是有效输入。
您还在验证函数 return 之前调用了 code_checker()，因此您将从 code_checker() 中的 Entry4 获得空字符串。在验证后使用 after() 安排 code_checker() 的执行。
最后，list3和list4是整数列表，但是enteredCode是字符串，所以检查结果总是2。之前将enteredCode转换为整数检查。
下面修改num_limit()和code_checker()：
def num_limit(p, this_field):
global codeLength
### check for empty string
if p == "": return True
print("Entry" + this_field + ": " + p)
this_field = int(this_field)
entries = [entry1, entry2, entry3, entry4]
if this_field < codeLength:
next_field = entries[this_field]
# Check if it's a number
if p.isdigit():
if this_field < codeLength:
# Set focus on next field
next_field.focus_set()
else:
# schedule execution of code_checker() after validation
root.after(100, code_checker)
return True
else:
# Check if it's Backspace or del/home/end/PgUp/PgDn
if p!="\x08" and p!="":
return False
else:
if this_field < codeLength:
next_field.focus_set()
else:
return True
def code_checker():
global code_check
global codeLength
print("== Code Check ==")
enteredCode = ''
enteredCode += entry1.get()
enteredCode += entry2.get()
enteredCode += entry3.get()
if codeLength == 3:
if int(enteredCode) in list3: # convert enteredCode to integer
code_check = 1
else:
code_check = 2
if codeLength == 4:
enteredCode += entry4.get()
if int(enteredCode) in list4: # convert enteredCode to integer
code_check = 1
else:
code_check = 2
show_result()
我尝试制作一个简单的数字检查器来显示数字是否正确。
在草草写了一些原型代码后，我无法清除字段。
我研究了有关此主题的许多问题，但找不到答案。
我的尝试是 show_result()
我做错了什么？
它应该接受数字，并且是最后一个数字；核实。如果正确，则显示接受图像，否则显示拒绝图像并在输入错误后清除条目。 3 秒后删除图像。
我怀疑 num_limit() 函数搞砸了，但我不知道是什么。
所有其他文件都可以在这里找到：https://bytebitten.stackstorage.com/s/JeRD33P92Us4a1Li
from tkinter import *
import time
#####
# Variables
code_check = 0
codeLength = 4
list3 = 123, 456
list4 = 2345, 3452
#####
# System
root = Tk()
root.title('Code Verifier')
root.attributes('-fullscreen', True)
root.bind('<Escape>',lambda e: root.quit())
#####
# Functions
# Input limiter function (WIP)
def num_limit(p, this_field):
global codeLength
print("Entry" + this_field + ": " + p)
this_field = int(this_field)
entries = [entry1, entry2, entry3, entry4]
next_field = entries[this_field]
# Check if it's a number
if p.isdigit():
if this_field < codeLength:
# Set focus on next field
next_field.focus_set()
pass
else:
code_checker()
return True
else:
# Check if it's Backspace or del/home/end/PgUp/PgDn
if p!="\x08" and p!="":
return False
else:
if this_field < codeLength:
next_field.focus_set()
else:
return True
def code_checker():
global code_check
global codeLength
print("== Code Check ==")
enteredCode = ''
enteredCode += entry1.get()
enteredCode += entry2.get()
enteredCode += entry3.get()
if codeLength == 3:
if enteredCode in list3:
code_check = 1
else:
code_check = 2
if codeLength == 4:
enteredCode += entry4.get()
if enteredCode in list4:
code_check = 1
else:
code_check = 2
show_result()
def show_result():
global code_check
print("== Show Result ==")
print(code_check)
# If code is correct
if code_check == 1:
# Image code accepted
main_canvas.create_image(width/2, 750, anchor=N, image=codeAccepted)
# If code is wrong
elif code_check == 2:
# Image code denied
main_canvas.create_image(width/2, 750, anchor=N, image=codeDenied)
# Clear fields
entry1.delete(0, END)
entry2.delete(0, END)
entry3.delete(0, END)
entry4.delete(0, END)
# Set focus to first field
entry1.focus_set()
else:
pass
#####
# Screen items
# Load images
codeDenied = PhotoImage(file='Assets/code_denied.png')
codeAccepted = PhotoImage(file='Assets/code_accepted.png')
# Set fullscreen canvas
main_canvas = Canvas(root, bg="#000000", bd=0, highlightthickness=0)
main_canvas.pack(fill="both", expand=True)
width = root.winfo_screenwidth()
height = root.winfo_screenheight()
# Input num limiter command
vcmd = root.register(func=num_limit)
# 3-6 single-digit input fields
entry1 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 1), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry2 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 2), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry3 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 3), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
entry4 = Entry(root, validate='key', validatecommand=(vcmd, '%P', 4), font=("Helvetica", 100), fg="#000000", bg="#ffffff", width=1, bd=0)
# Entry position adjust
field1 = -100
field2 = 0
field3 = 100
field4 = 150
# Entry placing
if codeLength == 3:
entry_window1 = main_canvas.create_window(width+field1, 500, anchor=N, window=entry1)
entry_window2 = main_canvas.create_window(width+field2, 500, anchor=N, window=entry2)
entry_window3 = main_canvas.create_window(width+field3, 500, anchor=N, window=entry3)
elif codeLength == 4:
field1 = field1-50
field2 = field2-50
field3 = field3-50
entry_window1 = main_canvas.create_window(width/2+field1, 500, anchor=N, window=entry1)
entry_window2 = main_canvas.create_window(width/2+field2, 500, anchor=N, window=entry2)
entry_window3 = main_canvas.create_window(width/2+field3, 500, anchor=N, window=entry3)
entry_window4 = main_canvas.create_window(width/2+field4, 500, anchor=N, window=entry4)
else:
pass
#####
root.mainloop()
在num_limit()里面，要检查Entry的内容是否为空，如果为空return则为真。如果没有此验证，您将无法删除 Entry 的内容，因为空字符串不是有效输入。
您还在验证函数 return 之前调用了 code_checker()，因此您将从 code_checker() 中的 Entry4 获得空字符串。在验证后使用 after() 安排 code_checker() 的执行。
最后，list3和list4是整数列表，但是enteredCode是字符串，所以检查结果总是2。之前将enteredCode转换为整数检查。
下面修改num_limit()和code_checker()：
def num_limit(p, this_field):
global codeLength
### check for empty string
if p == "": return True
print("Entry" + this_field + ": " + p)
this_field = int(this_field)
entries = [entry1, entry2, entry3, entry4]
if this_field < codeLength:
next_field = entries[this_field]
# Check if it's a number
if p.isdigit():
if this_field < codeLength:
# Set focus on next field
next_field.focus_set()
else:
# schedule execution of code_checker() after validation
root.after(100, code_checker)
return True
else:
# Check if it's Backspace or del/home/end/PgUp/PgDn
if p!="\x08" and p!="":
return False
else:
if this_field < codeLength:
next_field.focus_set()
else:
return True
def code_checker():
global code_check
global codeLength
print("== Code Check ==")
enteredCode = ''
enteredCode += entry1.get()
enteredCode += entry2.get()
enteredCode += entry3.get()
if codeLength == 3:
if int(enteredCode) in list3: # convert enteredCode to integer
code_check = 1
else:
code_check = 2
if codeLength == 4:
enteredCode += entry4.get()
if int(enteredCode) in list4: # convert enteredCode to integer
code_check = 1
else:
code_check = 2
show_result()