Importing library 'MongoDBLibrary' failed: ImportError: cannot import name '_get_object_size' from 'bson'这个错误怎么解决

这个错误一般是由于 `pymongo` 包和 `bson` 包版本不兼容造成的。你可以尝试以下方法解决：

1. 升级 `pymongo` 包到最新版本。

   pip install --upgrade pymongo

2. 升级 `bson` 包到最新版本。

   pip install --upgrade bson

如果以上方法都不行，可以尝试卸载 `pymongo` 和 `bson` 包，然后重新安装最新版本。

pip uninstall pymongo bson
pip install pymongo bson

如果仍然存在问题，你可以尝试安装 `pymongo` 的依赖包 `dnspython`。

pip install dnspython

如果还是无法解决问题，你可以考虑将 `pymongo` 和 `bson` 包降级到兼容的版本。

相关问题

ImportError: cannot import name 'rank_zero_only' from 'pytorch_lightning.utilities.distributed'

This error typically occurs when you are trying to import the `rank_zero_only` function from the `pytorch_lightning.utilities.distributed` module, but the function cannot be found.

This could be due to a few different reasons:

1. You may be using an outdated version of PyTorch Lightning that does not include the `rank_zero_only` function. Try updating to the latest version.

2. You may have misspelled the function name or the module name. Double-check that you are importing the correct function from the correct module.

3. It's possible that the `pytorch_lightning.utilities.distributed` module is not installed properly or is corrupted. Try reinstalling PyTorch Lightning and see if the issue persists.

4. There could be a conflict between different versions of PyTorch or other dependencies. Try creating a new virtual environment and installing only the required packages for your project.

If none of these solutions work, you may want to post a more detailed question with code snippets and error messages to get more specific help.

from flask import current_app ImportError: cannot import name 'current_app'

This error message indicates that there is an issue with importing the `current_app` object from the `flask` module. This object is used to access the current Flask application instance, and is typically used in a context where the application instance is not available through other means.

There are a few possible reasons why you might encounter this error:

1. You may be importing `current_app` from the wrong module. Make sure that you are importing it from the `flask` module and not another module with a similar name.

2. You may be importing `current_app` before the Flask application has been created. `current_app` is only available when a Flask application context is active, so if you try to import it outside of a request or application context, you will get this error. Make sure that you are importing `current_app` from within a Flask view function, or from within a function that is called within a Flask view function.

3. There may be a circular import issue in your application. Flask applications can be prone to circular import issues if you're not careful about how you structure your code. If you're importing `current_app` from a module that also imports something from the module where your Flask application instance is created, you may run into this error. Try restructuring your code to avoid circular imports.

To resolve this error, you should check your code for the above issues and make sure that you are importing `current_app` correctly and in the right context. You may also want to review the Flask documentation on application context and request context to better understand how they work.