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How can I have pip ignore all of the sub dependencies of a single dependency in a requirements.txt file?

I'm using python's virtual environment (python3 -m venv venv) and pip with requirements.txt. I need to use a package (python-particle) which has a dependency on a very old version of requests (2.7.0). I want to use a more recent version of requests (2.25.0 or later), but because python-particle is explicitly calling out "requests==2.7.0" I get an error when trying to use a later version of requests.
Is there a way to tell pip that the user requested version takes priority?
Alternatively, is there a way to tell pip to do dependency resolution for all packages except one?
Things I've tried...
I saw:
setup.py & pip: override one of the dependency's sub-dependency from requirements.txt
$ more requirements.txt
pexpect>=3.3
python-dateutil>=2.4.2
pytz>=2015.4
six>=1.15.0
python-particle>=0.2
$ more constraints.txt
requests>=2.25.0
but when I tried that I still got the error:
ERROR: Cannot install -r requirements.txt (line 5) because these package versions have conflicting dependencies.
The conflict is caused by:
python-particle 0.2 depends on requests==2.7.0
The user requested (constraint) requests>=2.25.0
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies
The version of pip that I'm using is:
$ pip --version
pip 21.3.1 from /home/xyzzy/src/tools/venv/lib/python3.9/site-packages/pip (python 3.9)
I also tried using --no-deps for just the one dependency (python-particle), but that didn't work. My requirements.txt for this attempt:
pexpect>=3.3
python-dateutil>=2.4.2
pytz>=2015.4
requests>=2.25.0
six>=1.15.0
python-particle>=0.2 --install-option="--no-deps"
The error message from pip:
ERROR: Cannot install -r requirements.txt (line 6) and requests>=2.25.0 because these package versions have conflicting dependencies.
The conflict is caused by:
The user requested requests>=2.25.0
python-particle 0.2 depends on requests==2.7.0
To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/user_guide/#fixing-conflicting-dependencies

Maybe use the --no-deps flag to install particle and then install the rest of requirements.txt normally?
pip install python-particle>=0.2
pip uninstall requests
pip install -r requirements.txt (after removing python-particle from this file)
With this method you will need to install every particle dependency other than requests yourself, or you can try this
pip install python-particle>=0.2
pip uninstall requests
pip install -r requirements.txt (again, no particle in this file)

Pip cannot install anything on ubuntu server

I had deleted an existing virtual environment. I created a new one and activated it. Now I am trying to install site packages using
pip install -r requirements.txt
But I keep getting the error
Cannot fetch index base URL https://pypi.python.org/simple/
Could not find any downloads that satisfy the requirement BeautifulSoup==3.2.1 (from -r requirements.txt (line 1))
Now I know that the packages are really old but this is running on python 2.7.6. I am also not able to install anything through pip. I have tried
pip install numpy
But it shows the same errors. As per the similar questions answered before the suggestion is to use https://pypi.python.org which I have already done but still facing these errors.
Would love to hear your suggestions.

Might be a problem with having an old version of pip.
Try pip install --upgrade pip and then try installing the requirements again.

pip tries to create lockfile in cache directory
Try running pip install --upgrade pip --no-cache-dir

PIP and python -m pip doesnt work when I specify the version

I have got a problem when I want to install a specific version of a python library since I updated pip to 10.0.0. I would like to install it back but I cant find it, so I am forced to use the whole command , but it doesnt let me to install specific version of python package, any idea how to do it ?
C:\Windows\system32>python -m pip install APScheduler==3.0.0
Collecting APScheduler==3.0.0
C:\Windows\system32>python -m pip install pip APScheduler==3.0.0
Requirement already satisfied: pip in c:\program files (x86)\python36-32\lib\site-packages (10.0.0)
Collecting APScheduler==3.0.0
C:\Windows\system32>python -m pip install APScheduler==3.0.0
Collecting APScheduler==3.0.0
C:\Windows\system32>python -m pip install pymongo
Collecting pymongo
Downloading https://files.pythonhosted.org/packages/c2/96/00951e252c6cad023b3fd60457b2ab1c1329073516086c7ac1b6833a439e/pymongo-3.6.1-cp36-cp36m-win32.whl (286kB)
100% |████████████████████████████████| 286kB 1.3MB/s
Installing collected packages: pymongo
Successfully installed pymongo-3.6.1
also this is the part of a pip error I am dealing with , so any help would be awesome ^.^ ( Tried few things from stack overflow but neighter of them worked )
C:\Windows\system32>pip install APScheduler==3.0.0
Fatal error in launcher: Unable to create process using '""c:\program files (x86)\python36-32\python.exe" "C:\Program Files (x86)\Python36-32\Scripts\pip.exe" install APScheduler==3.0.0'

Try using the --upgrade flag.
python -m pip install --upgrade APScheduler==3.0.0
It should work for downgrades as well

Make sure that both python.exe and pip are available in the locations in which it is looking for them. The pip launcher program is failing to run the command that it's printing in the error, which is probably because it can't find the relevant files.
Alternatively, just run pip using python -m pip which seems to work fine.

Python packages hash not matching whilst installing using pip

I am using pip to install all my python packages but get error as shown in the trace below. What is the problem and how can I solve it?
usr#comp:~$ pip install flask
Collecting flask
Using cached Flask-0.11.1-py2.py3-none-any.whl
Collecting itsdangerous>=0.21 (from flask)
Using cached itsdangerous-0.24.tar.gz
Collecting click>=2.0 (from flask)
Using cached click-6.6.tar.gz
Collecting Werkzeug>=0.7 (from flask)
Using cached Werkzeug-0.11.11-py2.py3-none-any.whl
Requirement already satisfied (use --upgrade to upgrade): Jinja2>=2.4 in /usr/lib/python2.7/dist-packages (from flask)
Requirement already satisfied (use --upgrade to upgrade): MarkupSafe in /usr/lib/python2.7/dist-packages (from Jinja2>=2.4->flask)
THESE PACKAGES DO NOT MATCH THE HASHES FROM THE REQUIREMENTS FILE. If you have updated the package versions, please update the hashes. Otherwise, examine the package contents carefully; someone may have tampered with them.
Werkzeug>=0.7 from https://pypi.python.org/packages/a9/5e/41f791a3f380ec50f2c4c3ef1399d9ffce6b4fe9a7f305222f014cf4fe83/Werkzeug-0.11.11-py2.py3-none-any.whl#md5=c63a21eedce9504d223ed89358c4bdc9 (from flask):
Expected md5 c63a21eedce9504d223ed89358c4bdc9
Got 13a168aafcc43354b6c79ef44bb0dc71

There is a similar problem (Why does pip fail with bad md5 hash for package?) from 2013 the solution that I tried that worked for me is this:
sudo pip install --no-cache-dir flask
given by attolee

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>

--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.

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

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

In case you got this error while using pipenv try
$ pipenv --clear
$ pipenv lock
$ pipenv install

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 cash
pip install --no-cache-dir the_library_name

I got the error during installing panads
You need to remove the cache and reinstall .
pip install --no-cache-dir flask

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.

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

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.

No distributions at all found for some package

error when installing some package but its actualy existing example django-ajax-filtered-fields==0.5
Downloading/unpacking django-ajax-filtered-fields==0.5 (from -r
requirements.example.pip (line 13)) Could not find any downloads
that satisfy the requirement django-ajax-filtered-fields==0.5(from
-r requirements.example.pip (line 13))
No distributions at all found for django-ajax-filtered-fields==0.5 Storing debug log for failure in /home/pd/.pip/pip.log
(peecs)pd#admin:~/proj/django/peecs$ pip install
django-ajax-filtered-fields==0.5 --allow-unverified
django-ajax-filtered-fields==0.5 Downloading/unpacking
django-ajax-filtered-fields==0.5 Could not find any downloads that
satisfy the requirement django-ajax-filtered-fields==0.5 Some
externally hosted files were ignored (use --allow-external
django-ajax-filtered-fields to allow). Cleaning up... No distributions
at all found for django-ajax-filtered-fields==0.5 Storing debug log
for failure in /home/pd/.pip/pip.log

Note that this error may also occure because you are using too old version of pip. Then it can be solved by:
pip install --upgrade pip
You can check your version by:
pip --version

I got the solution ,Try with --allow-unverified
syntax: pip install packagename=version --allow-unverified packagename
Some package condains insecure and unverifiable files. it will not download to the system . and it can be solved by using this method --allow-unverified. it will allow the installation.
Eg: pip install django-ajax-filtered-fields==0.5 --allow-unverified
django-ajax-filtered-fields

Proxy Settings
Still unsure if my issue has the same cause as with the OP, but one error message was the same:
Cannot fetch index base URL https://pypi.python.org/simple/
Could not find any downloads that satisfy the requirement Django
No distributions at all found for Django
Talking to a colleague exposed it was a site-security-based issue.
The following commands were required:
set https_proxy=*https proxy*
set http_proxy=*http proxy*
pip install Django
where *https proxy* and *http proxy* are appropriate URLs-with-ports for our site.
Downloading/unpacking Django
Installing collected packages: Django
Successfully installed Django
Cleaning up...

The only solution worked for me:
uninstall pip (pip uninstall pip)
download pip package from pypi (https://pypi.org/project/pip/)
execute python setup.py install (not using easy_install)
then you can install any package you want.

Inspecting the logs reveals the following line:
less .pip/pip.log
Could not fetch URL https://pypi.python.org/simple/WSGIUtils/: connection error: [Errno1] _ssl.c:493: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed
In an earlier version of the comment I attributed this behaviour to https://pypi.python.org, but this is not the issue, since I can contact this site (from another computer!) with firefox and all certificates are OK. So this is probably a problem of some installations of pip---I encounter it unter SLES 11 which has (among other things) the "oldstable" openssl-0.9.8.

Try upgrading pip.
Version 7.1.2 does not have this issue.
easy_install pip==7.1.2

Lots of solutions to this, most effectively coming down to update PIP.
On MacOS (Sierra), This was my solution:
Download python3 installer of choice
Install Package (this includes a newer version of pip)
Remove old version of python from $PATH in ~/.bash_login (new one added by installer)
pip3 install packagename (no sudo)
After that I was still prompted to update pip and did so: pip3 install --upgrade pip

You can install the library manually:
git clone https://github.com/roddds/django-ajax-filtered-fields.git
then go to the folder:
pip install .

I did following to install Openpyxl in Python version 3.5 after the following error with command
pip install openpyxl --allow-unverified openpyxl
DEPRECATION: --allow-unverified has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
Collecting openpyxl
Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x00000000044AF080>, 'Connection to pypi
.python.org timed out. (connect timeout=15)')': /simple/openpyxl/
Operation cancelled by user
C:\Softwares\Python\Scripts>set https_proxy=My proxy
C:\Softwares\Python\Scripts>pip install openpyxl --allow-unverified openpyxl
DEPRECATION: --allow-unverified has been deprecated and will be removed in the future. Due to changes in the repository protocol, it no longer has any effect.
Collecting openpyxl
Downloading openpyxl-2.4.8.tar.gz (156kB)
100% |████████████████████████████████| 163kB 3.7MB/s
Collecting jdcal (from openpyxl)
Downloading jdcal-1.3.tar.gz
Collecting et_xmlfile (from openpyxl)
Downloading et_xmlfile-1.0.1.tar.gz
Installing collected packages: jdcal, et-xmlfile, openpyxl
Running setup.py install for jdcal ... done
Running setup.py install for et-xmlfile ... done
Running setup.py install for openpyxl ... done
Successfully installed et-xmlfile-1.0.1 jdcal-1.3 openpyxl-2.4.8
That worked! Thanks Martin F for your tip.