Python Error: "AttributeError: enter" - Stack Overflow

Python Error: "AttributeError: enter"

2018-11-30T20:52:06Z

So, I can't load my json file and I don't know why, can anyone explain what I'm doing wrong?

async def give(msg, arg):
    if arg[0] == prefix + "dailycase":
                with open("commands/databases/cases.json", "r") as d:
                     data = json.load(d)

For some reason I'm getting this error:

    with open("commands/databases/cases.json", "r") as d:
AttributeError: __enter__

Answer by Lukas Graf for Python Error: "AttributeError: enter"

2018-11-30T21:06:58Z

Most likely, you have reassigned the Python builtin open function to something else in your code (there's almost no other plausible way this exception could be explained).

The with statement will then attempt to use it as a context manager, and will try to call its __enter__ method when first entering the with block. This then leads to the error message you're seeing because your object called open, whatever it is, doesn't have an __enter__ method.

Look for places in your Python module where you are re-assigning open. The most obvious ones are:

A function in the global scope, like def open(..)
Direct reassignment using open =
Imports like from foo import open or import something as open

The function is the most likely suspect, because it seems your open is actually a callable.

To aid you finding what object open was accidentally bound to, you can also try to

print('open is assigned to %r' % open)

immediately before your with statement. If it doesn't say <built-in function open>, you've found your culprit.

Answer by a20 for Python Error: "AttributeError: enter"

2020-09-25T09:11:36Z

I got this error at this line:

with concurrent.futures.ProcessPoolExecutor as executor:

missing brackets was the issue

with concurrent.futures.ProcessPoolExecutor() as executor:

Answer by Chris Pollitt for Python Error: "AttributeError: enter"

2020-11-29T08:23:55Z

In my case, I was intentionally defining a custom with function called stopwatch

with stopwatch('upload %d bytes' % len(data)):
    ...code...

And so had to add:

import contextlib

and prefix the custom function definition as follows:

@contextlib.contextmanager
def stopwatch(message):
    ...code...

Answer by pbatey for Python Error: "AttributeError: enter"

2021-10-13T17:05:24Z

My problem was that I was expecting os.open to work like the built-in open...

This results in AttributeError: __enter__

import os 
with os.open('out.txt', os.CREAT) as f:
  f.write('hello world')

This does not

with open('out.txt', 'w') as f:
  f.write('hello world')

I suppose it would be easy enough to cause the OP problem with from os import open.

Python Error: "AttributeError: __enter__" - Stack Overflow

Python Error: "AttributeError: __enter__"

Answer by Lukas Graf for Python Error: "AttributeError: __enter__"

Answer by a20 for Python Error: "AttributeError: __enter__"