You're looking at StableBuild's Deleted PyPI mirror - where we index all deleted packages from the Python package registry.
python-aliyun-sdk-rds was reported malicious
OSV:MAL-2023-8367 - Malicious code in python-aliyun-sdk-rds (PyPI)

python-aliyun-sdk-rds
2.7.43

This version was deleted from PyPI around 2023-09-29. Installing fails with:
$ pip3 install python-aliyun-sdk-rds==2.7.43 ERROR: Could not find a version that satisfies the requirement python-aliyun-sdk-rds==2.7.43
View other deleted versions of python-aliyun-sdk-rds

Install through StableBuild

You can install this package from StableBuild's PyPI snapshots from before the version was deleted:
pip3 install \ -i https://YOUR_API_KEY.pypimirror.stablebuild.com/2023-09-28/ \ python-aliyun-sdk-rds==2.7.43
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Or, download files manually

And install manually via pip:
python-aliyun-sdk-rds-2.7.43.tar.gz (46.4KB)