AttributeError: module 'bcrypt' has no attribute '__about__' with new 4.1.1 version

[roland-robert]

For bcrypt 4.1.1, I get this error/warning when I run this code (code which is in FastAPI documentation)
I have passlib 1.7.4

from passlib.context import CryptContext
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
pwd_context.hash('test')   

output

(trapped) error reading bcrypt version
Traceback (most recent call last):
  File "C:\path\venv\Lib\site-packages\passlib\handlers\bcrypt.py", line 620, in _load_backend_mixin
    version = _bcrypt.__about__.__version__
              ^^^^^^^^^^^^^^^^^
AttributeError: module 'bcrypt' has no attribute '__about__'
'$2b$12$dcl0YFoHz6.pL/dtOwbfO.r3CRI416BLq6vJEf0EmT4CHsqqHm7FC'

It's not breaking anything, because code still runs.

This is not the case with bcrypt 4.0.1

[reaperhulk]

This is an issue with how passlib attempts to read a version (for logging only) and fails because it's loading modules that no longer exist in bcrypt 4.1.x. I'd suggest filing an issue against them for this.

https://foss.heptapod.net/python-libs/passlib/-/blob/branch/stable/passlib/handlers/bcrypt.py#L619-623

[hyperknot]

Yep, passlib seems to be abandoned and the new bcrypt doesn't work with it. Needs to force bcrypt==4.0.1 to keep using passlib.

[alex]

As the OP indicates here, passlib will work with latest bcrypt, it simply emits a warning. You should be able to silence that warning with a logging configuration.

[patrick-m-m]

Props to the opener of the issue on passlib: https://foss.heptapod.net/python-libs/passlib/-/issues/190

Edited to add: silencing the warning via logging config worked fine for me, hat-tip to @alex

logging.getLogger('passlib').setLevel(logging.ERROR)

[creativebash]

Like others have pointed, passlib is not actively updated and it has dependencies that have changed behaviour over time.
I recently had this error (below) that indirectly triggered a CORS error on my frontend, due to middleware misinterpretation.

> (trapped) error reading bcrypt version
> Traceback (most recent call last):
>   File "C:\path\venv\Lib\site-packages\passlib\handlers\bcrypt.py", line 620, in _load_backend_mixin
>     version = _bcrypt.__about__.__version__
>               ^^^^^^^^^^^^^^^^^

I resolved it by removing the passlib module and simply using the bcrypt directly for hashing and verification :

import bcrypt

# Hash a password using bcrypt
def hash_password(password):
    pwd_bytes = password.encode('utf-8')
    salt = bcrypt.gensalt()
    hashed_password = bcrypt.hashpw(password=pwd_bytes, salt=salt)
    return hashed_password

# Check if the provided password matches the stored password (hashed)
def verify_password(plain_password, hashed_password):
    password_byte_enc = plain_password.encode('utf-8')
    return bcrypt.checkpw(password = password_byte_enc , hashed_password = hashed_password)

Reference: #https://www.geeksforgeeks.org/hashing-passwords-in-python-with-bcrypt/

[ArjunJayakrishnan]

For bcrypt 4.1.1, I get this error/warning when I run this code (code which is in FastAPI documentation) I have passlib 1.7.4

from passlib.context import CryptContext
pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
pwd_context.hash('test')   

output

(trapped) error reading bcrypt version
Traceback (most recent call last):
  File "C:\path\venv\Lib\site-packages\passlib\handlers\bcrypt.py", line 620, in _load_backend_mixin
    version = _bcrypt.__about__.__version__
              ^^^^^^^^^^^^^^^^^
AttributeError: module 'bcrypt' has no attribute '__about__'
'$2b$12$dcl0YFoHz6.pL/dtOwbfO.r3CRI416BLq6vJEf0EmT4CHsqqHm7FC'

It's not breaking anything, because code still runs.

This is not the case with bcrypt 4.0.1

just downgrade your bcrypt. i did it to 3.2.2. it works. it has __about attribute. hope my comment helps.

[bkis]

just downgrade your bcrypt. i did it to 3.2.2. it works. it has __about attribute. hope my comment helps.

And go without updates for a security-relevant library? 😬

[Nikhil22]

I resolved it by removing the passlib module and simply using the bcrypt directly for hashing and verification

I like this. Not a fan of using inactive libraries especially for straightforward things like this.

[ignore501]

Yep, passlib seems to be abandoned and the new bcrypt doesn't work with it. Needs to force bcrypt==4.0.1 to keep using passlib.

i dont know how but it solved not only this problem, but also the one with not finding my 'app' package when importing from it. Thank You!

[melakhvision]

Anyway to solve this issue ?
Fastapi

Environement :

python = ">=3.10,<4.0"
passlib = "^1.7.4"
fastapi = "^0.111.0"

It's like passlib is not compatible maybe because passlib not being maintained anymore?

[antheiz]

Anyway to solve this issue ? Fastapi

Environement :

python = ">=3.10,<4.0"
passlib = "^1.7.4"
fastapi = "^0.111.0"

It's like passlib is not compatible maybe because passlib not being maintained anymore?

You can remove passlib module and manually use bcrypt like this: #684 (comment).

---

And If anyone gets an error like this:

return bcrypt.checkpw(password=password_byte_enc, hashed_password=hashed_password) TypeError: argument 'hashed_password': 'str' object cannot be converted to 'PyBytes'

you can find information on how to resolve it here.

[chetat]

Anyway to solve this issue ? Fastapi
Environement :

python = ">=3.10,<4.0"
passlib = "^1.7.4"
fastapi = "^0.111.0"

It's like passlib is not compatible maybe because passlib not being maintained anymore?

You can remove passlib module and manually use bcrypt like this: #684 (comment).

And If anyone gets an error like this:

return bcrypt.checkpw(password=password_byte_enc, hashed_password=hashed_password) TypeError: argument 'hashed_password': 'str' object cannot be converted to 'PyBytes'

you can find information on how to resolve it here.

Thank you for SO link. It solved the TypeError: argument 'hashed_password': 'str' object cannot be converted to 'PyBytes' error.

[melakhvision]

To remove passlib I have to change a lot of thing.
Here is how I fix it.
in my python virtual environment which is devenv, in line 620 the bcrypt.py file, I replace version = _bcrypt.about.version to
version = _bcrypt.version

devenv/lib/python3.10/site-packages/passlib/handlers/bcrypt.py # location of my bcrypt.py file
version = _bcrypt.__version__ # to put in line 620 after the first line of the try block

No no error anymore. The correct version is shown when I run the fastapi project.

[jhonshua]

So my working fix is to change [line 620] like this:

venv\Lib\site-packages\passlib\handlers\bcrypt.py

version = _bcrypt.__about__.__version__

Previous ->version = _bcrypt.__about__.__version__

New -> version = getattr(_bcrypt, '__version__', '<unknown>')So my working fix is to change [line 620]

[himanshu076]

May this version 1.8 resolve this issue.

[himanshu076]

https://passlib.readthedocs.io/en/latest/install.html

[BrentHuang]

bcrypt version 4.2.0, passlib-1.7.4
There is still this error in fastapi: "(trapped) error reading bcrypt version"

[imikay]

pip show bcrypt  # check package location
cd /home/xxx/.pyenv/versions/3.10.10/envs/venv/lib/python3.10/site-packages/bcrypt # cd package location 

Remove everything in bcrypt folder, will regenerate upon the install process following.

rm -rf *  # remove everything in bcrypt folder

Reinstall it

pip uninstall bcrypt
pip install bcrypt

The package folder original contains _bcrypt.cpython-310-x86_64-linux-gnu.so, this .so file seems corrupt, this file will not get deleted when you do pip uninstall bcrypt, so you should delete it manually, after the new installation, the generated .so file called _bcrypt.abi3.so this time, I don't know why.

[zeeshanrafiqrana]

Still facing this error FastAPI
Python 3.12 , 3.11
Version current latest 4.2.0

/lib/python3.12/site-packages/passlib/handlers/bcrypt.py", line 620, in _load_backend_mixin
version = _bcrypt.about.version
^^^^^^^^^^^^^^^^^
AttributeError: module 'bcrypt' has no attribute 'about'

[dann2333]

Really need to consider replacing this out-of-maintenanced lib.

[to-sta]

Had the same issue in FastAPI with using passlib[bcrypt] and moved down to bcrypt 4.0.1, that solved the error for me.

[DarkJedi]

Had the same issue in FastAPI with using passlib[bcrypt] and moved down to bcrypt 4.0.1, that solved the error for me.

I'd strongly recommend using bcrypt directly, and removing passlib altogether. It was pretty much a single line change in my FastAPI project (changing pwd_context.verify to bcrypt.checkpw) as passlib as described in the FastAPI documentation acts purely as a wrapper around bcrypt anyway.
Better to remove the redundant dependency and not pin your project to out of date libraries!

[storenth]

Issue looks old fashioned, FastApi's open question still here: fastapi/full-stack-fastapi-template#1369

[carluma]

Due to the issue explained here, I solved it by creating a dataclass with a version attribute, setting it equal to the new standalone __version__ attribute of bcrypt, and then assigning it to a new attribute __about__ for bcrypt.

import bcrypt
from dataclasses import dataclass

@dataclass
class SolveBugBcryptWarning:
    __version__: str = getattr(bcrypt, "__version__")

setattr(bcrypt, "__about__", SolveBugBcryptWarning())

This way, we can still see the log warnings from passlib, and the bug also disappears.
Now, for example, this code works without any warnings or issues:

from dataclasses import dataclass

import bcrypt
from passlib.context import CryptContext


@dataclass
class SolveBugBcryptWarning:
    __version__: str = getattr(bcrypt, "__version__")


setattr(bcrypt, "__about__", SolveBugBcryptWarning())

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")


def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password):
    return pwd_context.hash(password)


hashed = get_password_hash(("1234"))
print(hashed)

[karpulix]

So my working fix is to change [line 620] like this:

venv\Lib\site-packages\passlib\handlers\bcrypt.py

version = _bcrypt.__about__.__version__

Previous ->version = _bcrypt.__about__.__version__

New -> version = getattr(_bcrypt, '__version__', '<unknown>')So my working fix is to change [line 620]

in order not to interfere with the library's source code, I tried this patch – it seems to work

import bcrypt
if not hasattr(bcrypt, '__about__'):
    bcrypt.__about__ = type('about', (object,), {'__version__': bcrypt.__version__})