函数未被访问

Question

这是我的代码：

self.msg_entry = Entry(bottom_label, bg="#2C3E50", fg=TEXT_COLOR, font=FONT)
self.msg_entry.place(relwidth=0.74, relheight=0.06, rely=0.008, relx=0.011)
self.msg_entry.focus()
self.msg_entry.bind("<Return>", self._on_enter_pressed)
  
def _on_enter_pressed(self, event):
  msg = self.msg_entry.get()
  self._insert_message(msg, "You")

将鼠标悬停在“按enter键”功能上时，显示该功能未被访问，并且出现以下错误：

Traceback (most recent call last):
      File "GUI.py", line 91, in <module>
        app = ChatApplication()
      File "GUI.py", line 15, in __init__
        self._setup_main_window()
      File "GUI.py", line 76, in _setup_main_window
        self.msg_entry.bind("<Return>", self._on_enter_pressed)
    AttributeError: 'ChatApplication' object has no attribute '_on_enter_pressed'

（我正在使用python中的tkinter实现GUI。）

我怎样才能解决这个问题

Answer 1

您有错误的缩进-_on_enter_pressed必须在__init__之外

def __init__(self):
    # ... code ..

    self.msg_entry = Entry(bottom_label, bg="#2C3E50", fg=TEXT_COLOR,  font=FONT)
    self.msg_entry.place(relwidth=0.74, relheight=0.06, rely=0.008,  relx=0.011)
    self.msg_entry.focus()
    self.msg_entry.bind("<Return>", self._on_enter_pressed)
  
# outside `__init__`

def _on_enter_pressed(self, event):
    msg = self.msg_entry.get()
    self._insert_message(msg, "You")