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installing mysqlclient locking failed

I am using python3.9 in django framework, for that I have to install mysqlclient. But error is coming when I try
pipenv install mysqlclient
output like this as error:
Courtesy Notice: Pipenv found itself running within a virtual environment, so it will automatically use that environment, instead of creating its own for any project. You can set PIPENV_IGNORE_VIRTUALENVS=1 to force pipenv to ignore that environment and create its own instead. You can set PIPENV__VERBOSITY=-1 to suppress this warning. Installing mysqlclient... Adding mysqlclient to Pipfile's [packages]... Installation Succeeded Pipfile.lock (06f36b) out of date, updating to (f95eff)... Locking [dev-packages] dependencies... Locking [packages] dependencies...
Resolving dependencies... Locking Failed!
CRITICAL:pipenv.patched.notpip._internal.resolution.resolvelib.factory:Could not find a version that satisfies the requirement django (from versions: none)
[ResolutionFailure]: File "C:\Users\meghd\anaconda3\lib\site-packages\pipenv\resolver.py", line 743, in _main
[ResolutionFailure]: resolve_packages(pre, clear, verbose, system, write, requirements_dir, packages, dev)
[ResolutionFailure]: File "C:\Users\meghd\anaconda3\lib\site-packages\pipenv\resolver.py", line 704, in resolve_packages
[ResolutionFailure]: results, resolver = resolve(
[ResolutionFailure]: File "C:\Users\meghd\anaconda3\lib\site-packages\pipenv\resolver.py", line 685, in resolve
[ResolutionFailure]: return resolve_deps(
[ResolutionFailure]: File "c:\users\meghd\anaconda3\lib\site-packages\pipenv\utils.py", line 1377, in resolve_deps
[ResolutionFailure]: results, hashes, markers_lookup, resolver, skipped = actually_resolve_deps(
[ResolutionFailure]: File "c:\users\meghd\anaconda3\lib\site-packages\pipenv\utils.py", line 1106, in actually_resolve_deps
[ResolutionFailure]: resolver.resolve()
[ResolutionFailure]: File "c:\users\meghd\anaconda3\lib\site-packages\pipenv\utils.py", line 884, in resolve
[ResolutionFailure]: raise ResolutionFailure(message=str(e))
[pipenv.exceptions.ResolutionFailure]: Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
You can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
Hint: try $ pipenv lock --pre if it is a pre-release dependency.
ERROR: No matching distribution found for django```

ERROR: Could not find a version that satisfies the requirement django-haystack==2.8.1

I have installed python3.6.4 and pipenv,and I have git my project to the centos7, and I want to install the project dependencies and used the code like that
pipenv install --deploy --ignore-pipfile
but I get the error like this:
Installing dependencies from Pipfile.lock (bd1720)...
?? ???????????????????????????????? 2/2 ? 00:00:00
An error occurred while installing django-haystack==2.8.1 --hash=sha256:8b54bcc926596765d0a3383d693bcdd76109c7abb6b2323b3984a39e3576028c! Will try again.
An error occurred while installing django-pure-pagination==0.3.0 --hash=sha256:02b42561b8afb09f1fb6ac6dc81db13374f5f748640f31c8160a374274b54713! Will try again.
Installing initially failed dependencies...
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/cli/command.py", line 253, in install
[InstallError]: site_packages=state.site_packages
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 2063, in do_install
[InstallError]: keep_outdated=keep_outdated
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 1312, in do_init
[InstallError]: pypi_mirror=pypi_mirror,
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 900, in do_install_dependencies
[InstallError]: retry_list, procs, failed_deps_queue, requirements_dir, **install_kwargs
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 796, in batch_install
[InstallError]: _cleanup_procs(procs, failed_deps_queue, retry=retry)
[InstallError]: File "/usr/local/lib/python3.6/site-packages/pipenv/core.py", line 703, in _cleanup_procs
[InstallError]: raise exceptions.InstallError(c.dep.name, extra=err_lines)
[pipenv.exceptions.InstallError]: Collecting django-haystack==2.8.1
[pipenv.exceptions.InstallError]: Using cached django-haystack-2.8.1.tar.gz (1.6 MB)
[pipenv.exceptions.InstallError]: ERROR: Command errored out with exit status 1:
[pipenv.exceptions.InstallError]: command: /home/lovers/.local/share/virtualenvs/HelloDjango-blog-tutorial-0FfZskE0/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-g2z8fsa3/django-haystack_153569cf40b54d2ab06ebfd5ae6e2c25/setup.py'"'"'; __file__='"'"'/tmp/pip-install-g2z8fsa3/django-haystack_153569cf40b54d2ab06ebfd5ae6e2c25/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-4uisc3da
[pipenv.exceptions.InstallError]: cwd: /tmp/pip-install-g2z8fsa3/django-haystack_153569cf40b54d2ab06ebfd5ae6e2c25/
[pipenv.exceptions.InstallError]: Complete output (13 lines):
[pipenv.exceptions.InstallError]: Traceback (most recent call last):
[pipenv.exceptions.InstallError]: File "<string>", line 1, in <module>
[pipenv.exceptions.InstallError]: File "/home/lovers/.local/share/virtualenvs/HelloDjango-blog-tutorial-0FfZskE0/lib/python3.8/site-packages/setuptools/__init__.py", line 18, in <module>
[pipenv.exceptions.InstallError]: from setuptools.dist import Distribution
[pipenv.exceptions.InstallError]: File "/home/lovers/.local/share/virtualenvs/HelloDjango-blog-tutorial-0FfZskE0/lib/python3.8/site-packages/_virtualenv.py", line 89, in exec_module
[pipenv.exceptions.InstallError]: old(module)
[pipenv.exceptions.InstallError]: File "/home/lovers/.local/share/virtualenvs/HelloDjango-blog-tutorial-0FfZskE0/lib/python3.8/site-packages/setuptools/dist.py", line 34, in <module>
[pipenv.exceptions.InstallError]: from setuptools import windows_support
[pipenv.exceptions.InstallError]: File "/home/lovers/.local/share/virtualenvs/HelloDjango-blog-tutorial-0FfZskE0/lib/python3.8/site-packages/setuptools/windows_support.py", line 2, in <module>
[pipenv.exceptions.InstallError]: import ctypes
[pipenv.exceptions.InstallError]: File "/usr/local/lib/python3.8/ctypes/__init__.py", line 7, in <module>
[pipenv.exceptions.InstallError]: from _ctypes import Union, Structure, Array
[pipenv.exceptions.InstallError]: ModuleNotFoundError: No module named '_ctypes'
[pipenv.exceptions.InstallError]: ----------------------------------------
[pipenv.exceptions.InstallError]: WARNING: Discarding https://files.pythonhosted.org/packages/69/43/3e247b7b2134b48e9a53fb387e191e5e05b5f38f2faf78ca892097c2b441/django-haystack-2.8.1.tar.gz#sha256=8b54bcc926596765d0a3383d693bcdd76109c7abb6b2323b3984a39e3576028c (from https://pypi.org/simple/django-haystack/). Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
[pipenv.exceptions.InstallError]: ERROR: Could not find a version that satisfies the requirement django-haystack==2.8.1
[pipenv.exceptions.InstallError]: ERROR: No matching distribution found for django-haystack==2.8.1
ERROR: Couldn't install package: django-haystack
Package installation failed...
? ???????????????????????????????? 1/2 ? 00

ok, when I have tried so many methods, I found the solutions to the problem.
Use the code like this
pipenv install -r requirements.txt --python 3.6
and then use the commend like that
pipenv shell
pipenv run
at last, try again
pipenv install --deploy --ignore-pipfile
and it worded!

Cannot install opencv-python with pipenv and Python 3.8

I just installed Python 3.8 on my Mac OS X (10.15.1) and was trying to add opencv-python to my pipenv project. I did the following:
$> pipenv install opencv-python
Installing dependencies from Pipfile.lock (ec16ad)…
An error occurred while installing opencv-python==4.1.1.26 --hash=sha256:01505b131dc35f60e99a5da98b77156e37f872ae0ff5596e5e68d526bb572d3c --hash=sha256:0478a1037505ddde312806c960a5e8958d2cf7a2885e8f2f5dde74c4028e0b04 --hash=sha256:17810b89f9ef8e8537e75332acf533e619e26ccadbf1b73f24bf338f2d327ddd --hash=sha256:19ad2ea9fb32946761b47b9d6eed51876a8329da127f27788263fecd66651ba0 --hash=sha256:1a250edb739baf3e7c25d99a2ee252aac4f59a97e0bee39237eaa490fd0281d3 --hash=sha256:3505468970448f66cd776cb9e179570c87988f94b5cf9bcbc4c2d88bd88bbdf1 --hash=sha256:4e04a91da157885359f487534433340b2d709927559c80acf62c28167e59be02 --hash=sha256:5a49cffcdec5e37217672579c3343565926d999642844efa9c6a031ed5f32318 --hash=sha256:604b2ce3d4a86480ced0813da7fba269b4605ad9fea26cd2144d8077928d4b49 --hash=sha256:61cbb8fa9565a0480c46028599431ad8f19181a7fac8070a700515fd54cd7377 --hash=sha256:62d7c6e511c9454f099616315c695d02a584048e1affe034b39160db7a2ae34d --hash=sha256:6555272dd9efd412d17cdc1a4f4c2da5753c099d95d9ff01aca54bb9782fb5cf --hash=sha256:67d994c6b2b14cb9239e85dc7dfa6c08ef7cf6eb4def80c0af6141dfacc8cbb9 --hash=sha256:68c9cbe538666c4667523821cc56caee49389bea06bae4c0fc2cd68bd264226a --hash=sha256:822ad8f628a9498f569c57d30865f5ef9ee17824cee0a1d456211f742028c135 --hash=sha256:82d972429eb4fee22c1dc4204af2a2e981f010e5e4f66daea2a6c68381b79184 --hash=sha256:9128924f5b58269ee221b8cf2d736f31bd3bb0391b92ee8504caadd68c8176a2 --hash=sha256:9172cf8270572c494d8b2ae12ef87c0f6eed9d132927e614099f76843b0c91d7 --hash=sha256:952bce4d30a8287b17721ddaad7f115dab268efee8576249ddfede80ec2ce404 --hash=sha256:a8147718e70b1f170a3d26518e992160137365a4db0ed82a9efd3040f9f660d4 --hash=sha256:bfdb636a3796ff223460ea0fcfda906b3b54f4bef22ae433a5b67e66fab00b25 --hash=sha256:c9c3f27867153634e1083390920067008ebaaab78aeb09c4e0274e69746cb2c8 --hash=sha256:d69be21973d450a4662ae6bd1b3df6b1af030e448d7276380b0d1adf7c8c2ae6 --hash=sha256:db1479636812a6579a3753b72a6fefaa73190f32bf7b19e483f8bc750cebe1a5 --hash=sha256:db8313d755962a7dd61e5c22a651e0743208adfdb255c6ec8904ce9cb02940c6 --hash=sha256:e4625a6b032e7797958aeb630d6e3e91e3896d285020aae612e6d7b342d6dfea --hash=sha256:e8397a26966a1290836a52c34b362aabc65a422b9ffabcbbdec1862f023ccab8! Will try again.
🐍 ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 2/2 — 00:00:00
Installing initially failed dependencies…
[pipenv.exceptions.InstallError]: File "/Users/stevenbarnett/Library/Python/3.8/lib/python/site-packages/pipenv/core.py", line 1863, in do_install
[pipenv.exceptions.InstallError]: do_init(
[pipenv.exceptions.InstallError]: File "/Users/stevenbarnett/Library/Python/3.8/lib/python/site-packages/pipenv/core.py", line 1246, in do_init
[pipenv.exceptions.InstallError]: do_install_dependencies(
[pipenv.exceptions.InstallError]: File "/Users/stevenbarnett/Library/Python/3.8/lib/python/site-packages/pipenv/core.py", line 858, in do_install_dependencies
[pipenv.exceptions.InstallError]: batch_install(
[pipenv.exceptions.InstallError]: File "/Users/stevenbarnett/Library/Python/3.8/lib/python/site-packages/pipenv/core.py", line 763, in batch_install
[pipenv.exceptions.InstallError]: _cleanup_procs(procs, not blocking, failed_deps_queue, retry=retry)
[pipenv.exceptions.InstallError]: File "/Users/stevenbarnett/Library/Python/3.8/lib/python/site-packages/pipenv/core.py", line 681, in _cleanup_procs
[pipenv.exceptions.InstallError]: raise exceptions.InstallError(c.dep.name, extra=err_lines)
[pipenv.exceptions.InstallError]: []
[pipenv.exceptions.InstallError]: ['ERROR: Could not find a version that satisfies the requirement opencv-python==4.1.1.26 (from -r /var/folders/17/82l5td8d01nbgslcj1lbfh8r0000gn/T/pipenv-glzkfmcm-requirements/pipenv-a34e3whg-requirement.txt (line 1)) (from versions: none)', 'ERROR: No matching distribution found for opencv-python==4.1.1.26 (from -r /var/folders/17/82l5td8d01nbgslcj1lbfh8r0000gn/T/pipenv-glzkfmcm-requirements/pipenv-a34e3whg-requirement.txt (line 1))']
ERROR: ERROR: Package installation failed...
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$>
What am I doing wrong? I thought pipenv was supposed to prevent all of these dependency errors...

As #eyllanesc mentioned, kindly please try installing opencv-python for lower version for python e.g. python 3.7
Reason is still python 3.8 package not yet available for opencv-python as shown in below url .
https://pypi.org/project/opencv-python/#files

pipenv not consistant from local to server

Im using pipenv to manage my dependencies,
I have the following command working fine on my local machine:
pipenv install --dev
but when I run it on the server I get the following error:
n error occurred while installing pyparsing==2.4.1 --hash=sha256:530d8bf8cc93a34019d08142593cf4d78a05c890da8cf87ffa3120af53772238 --hash=sha256:f78e99616b6f1a4745c0580e170251ef1bbafc0d0513e270c4bd281bf29d2800 --hash=sha256:530d8bf8cc93a34019d08142593cf4d78a05c890da8cf87ffa3120af53772238 --hash=sha256:f78e99616b6f1a4745c0580e170251ef1bbafc0d0513e270c4bd281bf29d2800! Will try again.
🐍 ▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉▉ 237/237 — 00:00:30
Installing initially failed dependencies…
[pipenv.exceptions.InstallError]: File "/home/ubuntu/.local/lib/python3.6/site-packages/pipenv/core.py", line 1874, in do_install
[pipenv.exceptions.InstallError]: keep_outdated=keep_outdated
[pipenv.exceptions.InstallError]: File "/home/ubuntu/.local/lib/python3.6/site-packages/pipenv/core.py", line 1253, in do_init
[pipenv.exceptions.InstallError]: pypi_mirror=pypi_mirror,
[pipenv.exceptions.InstallError]: File "/home/ubuntu/.local/lib/python3.6/site-packages/pipenv/core.py", line 859, in do_install_dependencies
[pipenv.exceptions.InstallError]: retry_list, procs, failed_deps_queue, requirements_dir, **install_kwargs
[pipenv.exceptions.InstallError]: File "/home/ubuntu/.local/lib/python3.6/site-packages/pipenv/core.py", line 763, in batch_install
[pipenv.exceptions.InstallError]: _cleanup_procs(procs, not blocking, failed_deps_queue, retry=retry)
[pipenv.exceptions.InstallError]: File "/home/ubuntu/.local/lib/python3.6/site-packages/pipenv/core.py", line 681, in _cleanup_procs
[pipenv.exceptions.InstallError]: raise exceptions.InstallError(c.dep.name, extra=err_lines)
[pipenv.exceptions.InstallError]: ['Collecting pyparsing==2.4.1 (from -r /tmp/pipenv-nfz65sbh-requirements/pipenv-11553m_x-requirement.txt (line 1))']
[pipenv.exceptions.InstallError]: ['ERROR: Could not find a version that satisfies the requirement pyparsing==2.4.1 (from -r /tmp/pipenv-nfz65sbh-requirements/pipenv-11553m_x-requirement.txt (line 1)) (from versions: 1.4.6, 1.4.7, 1.4.8, 1.4.11, 1.5.0, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 1.5.7, 2.0.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.1.0, 2.1.1, 2.1.2, 2.1.3, 2.1.4, 2.1.5, 2.1.6, 2.1.7, 2.1.8, 2.1.9, 2.1.10, 2.2.0, 2.2.1, 2.2.2, 2.3.0, 2.3.1, 2.4.0, 2.4.1.1, 2.4.2a1)', 'ERROR: No matching distribution found for pyparsing==2.4.1 (from -r /tmp/pipenv-nfz65sbh-requirements/pipenv-11553m_x-requirement.txt (line 1))']
I have handled pipenv errors before and most were pretty reasonable (clashes between dependency and sub-dependecies), but this one makes less sense to me as I did not specifically installed this package, but rather pipenv added it to the pipfile.lock and it doesnt find that version all together while locally that version is available for some reason.
I dont know which dependency is asking for that specific version either.
Pipfile.lock section:
"pyparsing": {
"hashes": [
"sha256:530d8bf8cc93a34019d08142593cf4d78a05c890da8cf87ffa3120af53772238",
"sha256:f78e99616b6f1a4745c0580e170251ef1bbafc0d0513e270c4bd281bf29d2800"
],
"version": "==2.4.1"
},
Any ideas?
EDIT:
you can see in the releases for pyparsing that this version does exist. See it here

Turns out that pyparsing have deleted a version, which is really weird.
I ended up updating a package (scipy) and it update pyparsing to 2.4.1.1, now works fine

Unable to install Django with pipenv because of pytz package failure

This has caused problems for me when developing with django, the simplest case to reproduce this error follows.
I'm using Anaconda 4.6.4 running Python 3.6.5, pip version 19.0.3, and pipenv version 2018.11.26. I've updated all the packages, even tried to use previous versions of several packages.
When I use:
pipenv shell
I get a new virtual environment, then I try:
pipenv install django
I then get the following error message:
Installing django…
Adding django to Pipfile's [packages]…
Installation Succeeded
Pipfile.lock not found, creating…
Locking [dev-packages] dependencies…
Locking [packages] dependencies…
Success!
Updated Pipfile.lock (85c883)!
Installing dependencies from Pipfile.lock (85c883)…
An error occurred while installing pytz==2018.9 --hash= ! Will try again.
================================ 2/2 - 00:00:01
Installing initially failed dependencies…
[pipenv.exceptions.InstallError]: File "c:\programdata\anaconda3\lib\site-packages\pipenv\core.py", line 1992, in do_install
[pipenv.exceptions.InstallError]: skip_lock=skip_lock,
[pipenv.exceptions.InstallError]: File "c:\programdata\anaconda3\lib\site-packages\pipenv\core.py", line 1253, in do_init
[pipenv.exceptions.InstallError]: pypi_mirror=pypi_mirror,
[pipenv.exceptions.InstallError]: File "c:\programdata\anaconda3\lib\site-packages\pipenv\core.py", line 859, in do_install_dependencies
[pipenv.exceptions.InstallError]: retry_list, procs, failed_deps_queue, requirements_dir, **install_kwargs
[pipenv.exceptions.InstallError]: File "c:\programdata\anaconda3\lib\site-packages\pipenv\core.py", line 763, in batch_install
[pipenv.exceptions.InstallError]: _cleanup_procs(procs, not blocking, failed_deps_queue, retry=retry)
[pipenv.exceptions.InstallError]: File "c:\programdata\anaconda3\lib\site-packages\pipenv\core.py", line 681, in _cleanup_procs
[pipenv.exceptions.InstallError]: raise exceptions.InstallError(c.dep.name, extra=err_lines)
[pipenv.exceptions.InstallError]: []
[pipenv.exceptions.InstallError]: ['Usage: pip [options]', '', 'Invalid requirement: pytz==2018.9 --hash=\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00', 'pip: error: Arguments to --hash must be a hash name followed by a value, like --hash=sha256:abcde...']
ERROR: ERROR: Package installation failed...
================================ 0/1 - 00:00:00
This occurs when I'm using command line, power shell, pycharm, atom editor. I've searched for similar errors online all over the place but can't find anything relevant to this. I tried looking at the pipenv source code for the batch_install and _clean_procs functions among others in the stack trace, but couldn't figure out why it's failing.