Getting error while writing bytes to file?

Question

I am working on a tkinter projects which save encrypted passwords. I am writing key to this path: C:\Users\<usrname>\.PassManager\PassManager.key.

It was working fine, all of sudden I do not what happened I am getting this error. While writing I have mentioned to write bytes to file. It doesn't seems working.

Understanding:

Error: 'bool' object

self.key_path() is not a boolean variable?

What is the cause of this problem?

Error:

<class 'bytes'>
b'Oy21Nnu_A0f7xFuS-7pnFegt5Dj0ks6n4_ksOPzlYck=' #<-------Writing this key

Traceback (most recent call last):
  File "c:\Users\rohit\Desktop\Password Manager\app.py", line 559, in <module>
    app = App()
          ^^^^^
  File "c:\Users\rohit\Desktop\Password Manager\app.py", line 40, in __init__
    self.b64key = self.key()
                  ^^^^^^^^^^
  File "c:\Users\rohit\Desktop\Password Manager\app.py", line 522, in key
    with open(self.key_path, "wb") as file:
TypeError: 'bool' object does not support the context manager protocol

Code:

class App(CTk):
    def __init__(self):
        super().__init__()
        self.count = True

        self.db_path = self.get_db_path()
        self.key_path = self.get_key_path()

        # Writing up db and key files
        self.dirFile_setup()


        # Secret key
        self.b64key = self.key()

# --------------- Code -------------------------

    def key():
        if path.exists(self.key_path) and stat(self.key_path).st_size == 0:
        key_ = Fernet.generate_key()
        print(type(key_))

        with open(self.key_path, "wb") as file:
            file.write(key_)
            file.close()
        return key_
            
        else:# Opening exist file
            with open(self.key_path, "r") as file:
               return file.readlines()[0]

Answer 1

Somewhere in your code you've overridden/shadowed the built-in open function with some callable that returns either True or False

Here are some examples that would lead to the exception you're observing:

# 1st possibility
def open():
    return True

# 2nd possibility
open = lambda: False

# 3rd possibility
def banana():
    return True

open = banana

# Then...
with open() as _:
    ...

...leads to...

TypeError: 'bool' object does not support the context manager protocol