tkinter 条目允许空白提交，必须手动擦除

Question

好的，所以脚本运行，你键入一个条目，按提交，弹出窗口显示键入的内容。我有两个问题想帮忙解决。空白提交并在点击提交后清除文本。

空白提交： 输入 1： 你好 输入 2： 世界 输入3： "无类型" 输入 4：你好世界 我在输入 3 上得到一个空行，但我不希望发生任何事情(不需要错误消息) 我尝试添加 .strip() 但这不起作用/我没有正确放入它，我在第 13 行的末尾尝试了它name=entry.get().strip我尝试添加一行entry.strip()

清除文本：输入 1：欢迎输入 输入 2：到 输入 3：python 我必须手动擦除条目小部件的文本输入，然后才能键入下一行

import tkinter as tk
flag = False
win=""
def setflag(event):
global flag
flag = False

#function that prints the entry
def entry_function(e=None):
global flag,win
name = entry.get()
if not flag:
win = tk.Toplevel()
win.geometry('100x100')
win.bind('<Destroy>', setflag)
tk.Label(win, text=name).pack()
flag = True
win.geometry("+%d+%d" % (x + 600, y + 300))
else:
tk.Label(win, text=name).pack()

#Setup for the window
window = tk.Tk()
window.title("Title_Name")
window.geometry("500x500")
window.bind('<Return>', entry_function)
x = window.winfo_x()
y = window.winfo_y()
#widgets
label = tk.Label(window, text = "Manual:", bg = "dark grey", fg = "white")
entry = tk.Entry(window)
button = tk.Button(window,text = "submit",
command = entry_function)
#widget placement
label.place(x=0,y=20)
entry.place(x=52,y=21)
button.place(x=177, y=18)
window.mainloop()

Answer 1

对代码进行了一些更改(代码注释中的解释)：

import tkinter as tk

# no need to use flag because just change win to None
# and check if it is None rather than using an 
# additional variable
win = None

# this would set win variable to None
def set_win_none(event=None):
global win
win = None

def entry_function(event=None):
global win
name = entry.get()

# check if the string is empty, if so
# stop the function
if not name:
return
# clear the entry
entry.delete('0', 'end')

# as mentioned win can be used, it just shortens the code
if win is None:
win = tk.Toplevel()
# set geometry as needed, this
# will place the window
# on the right of the main window
win.geometry(f'100x100+{window.winfo_x() + window.winfo_width()}+{window.winfo_y()}')
win.bind('<Destroy>', set_win_none)
tk.Label(win, text=name).pack()
else:
tk.Label(win, text=name).pack()

window = tk.Tk()
label = tk.Label(window, text="Manual:", bg="dark grey", fg="white")
entry = tk.Entry(window)
button = tk.Button(window, text="submit", command=entry_function)
# better bind the return key to the entry since it is
# directly involved
entry.bind('<Return>', entry_function)
# very rarely do you need to use .place
# better use .grid or .pack
label.grid(row=0, column=0, padx=5)
entry.grid(row=0, column=1, padx=5)
button.grid(row=0, column=2, padx=5)
window.mainloop()

很少需要使用.place，更好地使用.grid或.pack方法来放置小部件，它们更加动态并适应窗口的变化。

另外：
我强烈建议遵循PEP 8 - Python Code风格指南。函数和变量名应为snake_case，类名应为CapitalCase。如果它用作关键字参数的一部分(func(arg='value'))，则=周围没有空格，但如果它用于分配值(variable = 'some value')，则=周围有空格。在运算符周围留出空间(+-/等：value = x + y(此处除外value += x + y))。在函数和类声明周围有两个空行。