Python packages hash not matching whilst installing using pip

--no-cache-dir did not work for me in raspberry pi 4 at first.

Found that the problem was due to unexpected network change/failure during pip installation

I had to download the broken .whl file manually with wget

and install it like below:
sudo pip install scipy-1.3.0-cp37-cp37m-linux_armv7l.whl

followed by
sudo pip install --no-cache-dir keras

Then it worked.

You need to upgrade your pip into the newer version:

Using this command:

python -m pip install --upgrade pip

for Mac/Linux operating system and use

python -m pip install --upgrade tensorflow

for Windows to update your pip. Then run your command

 pip install flask

Looks like a cache problem, the cached package is different from REQUIREMENTS.

Perhaps caused by last updates interruption.

I did this which fixed my problem:

rm ~/.cache/pip -rf

I had a similar issue for a different module. It was caused by network failure. My fix was nothing complex but another attempt at installing it and it worked.

First, try to upgrade your pip then install the library:

python -m pip install --upgrade pip

If it didn’t work, just try to install it without the cache:

pip install --no-cache-dir the_library_name

The problem here is the Python package was updated with new hash value while pip was trying to install the Python package using the old hash value cached in pip cache directory. This cache needs to be purge before the pip install attempt. So the full solution is:

python -m pip cache purge
python -m pip install <package>

maybe pipiserver(where you pip install from) upload a pkg for example flask-1.0.0.tar.gz, and rm is upload a new flask-1.0.0.tag.gz,if new pkg code has changed ,the hash must be different,there is two ways:

1. installl an older pkg version =, pip install flask==0.0.9
2. wait new pkg release flask==1.0.1 or cache expiration.

In case you got this error while using pipenv try

$ pipenv --clear
$ pipenv lock
$ pipenv install

I have tried to clear pip cache with -m pip cache purge and using the --no-cache-dir argument but it was not helping.

In my case it was VPN being active during the attempts to install the package. As soon as I have turned it off everything worked as expected.

This worked for me!

pip install --no-cache-dir flask --user

The solution that worked for me:

    $ source .venv/Scripts/activate
    $ python -m pip install --upgrade pip
    $ python -m pip install <package> --no-cache-dir

If it does not work for some packages try to do this before the previous steps: https://stackoverflow.com/a/69668918/17596747

Then do the first 3 steps again.

UPD. Also maybe the problem is in VPN. Try to turn off/turn on VPN and see if this helps.

--no-cache-dir and cleaning the cash didn’t work.

I installed .whl package through link in error text and installed it with pip install like: pip install Werkzeug-0.11.11-py2.py3-none-any.whl (in the same folder where it is downloaded).

After that everything worked with same pip install command that returned a error.

Try:

rm -rf "$(pip cache dir)"

And if you’re using conda:

conda clean --all

If your pip is version 3 then you should try:
pip3 install <package name>