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import pystan._api failed:ImportError: DLL load failed: The specified module could not be found

I have installed python 3.7 and want to do some forecasting using fbprophet (https://facebook.github.io/prophet/docs/installation.html#python)
But I get this error when installing the package using the command (pip install fbprophet)
import pystan
File "e:\repos\usf\venv\lib\site-packages\pystan\__init__.py", line 9, in <module>
from pystan.api import stanc, stan
File "e:\repos\usf\venv\lib\site-packages\pystan\api.py", line 13, in <module>
import pystan._api # stanc wrapper
ImportError: DLL load failed: The specified module could not be found.
I have done some research and got to know that this is possible with conda. But I am looking for a solution without using conda.
Thanks in advance.

It says in the Pystan documentation that configuring a C++ compiler can be challenging on Windows. Following approach worked for me to install Pystan 2.17.1 and FBProphet 0.6:
Install C++ compiler, mingw-w64 (http://mingw-w64.org/doku.php/download) -> I selected this one https://sourceforge.net/projects/mingw-w64/files/
Add C:<MinGW_w64 installation directory>\bin to the PATH environment variable
Create a distutils.cfg file with the following contents in the folder \Lib\distutils in Python install directory (in venv):
[build]
compiler=mingw32
[build_ext]
compiler=mingw32
pip install numpy cython
pip install pystan==2.17.1
Verify the Pystan installation (https://pystan.readthedocs.io/en/latest/windows.html)
pip install fbprophet==0.6

Follow https://github.com/facebook/prophet/issues/1939
I had similar issues even after installing Mingw
conda install libpython m2w64-toolchain -c msys2
Solved all the errors and i am able to install fbprophet finally
Thanks

I had similar issues with my Python3.6 (anaconda)
I reinstalled anaconda for all users (with admin privileges) then
"conda install -c conda-forge pystan"
later i updated all other modules
it works without any error now

Getting module 'google.protobuf.descriptor_pool' has no attribute 'Default' in my python script

I am new to python and was using a python script written by someone else. I was running it fine in a different PC. Just had to install coupe of packages including pip3, google-cloud, google-cloud-bigquery and pandas.
Now when I installed the same packages on a different PC, I am unable to run the script. It is showed the following error first:
module = 'google.protobuf.descriptor_pb2' TypeError: expected bytes, Descriptor found
However, when In purged/re-installed/updated packages and also added protobuf3 and protobuf-py3 package, The error has been updated to the following message:
from google.cloud import bigquery
File "/home/mobeen/.local/lib/python3.6/site-packages/google/cloud/bigquery/__init__.py", line 35, in <module>
from google.cloud.bigquery.client import Client
File "/home/mobeen/.local/lib/python3.6/site-packages/google/cloud/bigquery/client.py", line 50, in <module>
import google.cloud._helpers
File "/home/mobeen/.local/lib/python3.6/site-packages/google/cloud/_helpers.py", line 33, in <module>
from google.protobuf import duration_pb2
File "/home/mobeen/.local/lib/python3.6/site-packages/google/protobuf/duration_pb2.py", line 8, in <module>
from google.protobuf import symbol_database as _symbol_database
File "/home/mobeen/.local/lib/python3.6/site-packages/google/protobuf/symbol_database.py", line 193, in <module>
_DEFAULT = SymbolDatabase(pool=descriptor_pool.Default())
AttributeError: module 'google.protobuf.descriptor_pool' has no attribute 'Default'
.Any help or leads in this will be appreciated

I solved the problem by uninstalling protobuf:
pip3 uninstall protobuf
pip3 uninstall python3-protobuf
NB: You should repeat this command until you get a message that there is no package named protobuf.
After that execute:
pip3 install protobuf
Install just the protobuf , don't install python3-protobuf
Hope this solution can help you.

I solved it by first executing twice
pip3 uninstall protobuf
The second time the terminal returned
Found existing installation: protobuf 3.6.1
Not uninstalling protobuf at /usr/lib/python3/dist-packages, outside environment /usr
Can't uninstall 'protobuf'. No files were found to uninstall.
Then I removed protobuf manually
sudo rm -r /usr/lib/python3/dist-packages/google/protobuf*
sudo rm -r /usr/lib/python3/dist-packages/protobuf*
And finally I executed
pip3 install --upgrade protobuf
And the problem was solved

Did you try this too?
"I solved the problem of showed Attribute Error: 'module' object has no attribute 'Default' when import tensorflow after installed by delete redundant protobuf file.
The reason is some google/protobuf/descriptor_pool.py do not have a 'Default' defined. This usually happened at old version of protobuf so I upgraded successfully, but problem not solved. And by checking PATH and search about 'google/protobuf', I found it existed in both "/usr/local/lib/python2.7/dist-packages/google/protobuf/" and "/usr/lib/python2.7/dist-packages/google/protobuf/". Previous one have attribute 'Default' but the second one not.
I tried import google.protobuf and google.protobuf.file, It shows '/usr/lib/python2.7/dist-packages/google/protobuf/init.pyc'. I deleted /usr/lib/python2.7/dist-packages/google/protobuf and tried to import tensorflow, worked."

Actually I've ran into a similar case, we had 2 packages installed protobuf and python3-protobuf. I actually dont know the root cause for this but apparently when you do that:
pip install protobuf
pip install python3-protobuf
that error you described is happening, looks like it gives you some different version, like those two packages have overlapping files, and they override each other or something.
the solution for me was simply to reverse the installation order (make sure to uninstall them both first):
pip install python3-protobuf
pip install protobuf
or just
pip install python3-protobuf protobuf
hope this helps anyone here.

The reason can be that the interpreter that you are using to run the python programm uses the previous version of google.protobuf
You can assure it to run in the interpreter
>>> import google.protobuf
>>> print google.protobuf.__version__
Then compare it running in the terminal
$pip show protobuf
If the versions are different that's the reason
So I suggest deleting this package right from the python interpreter console
>>> pip uninstall protobuf -y
After you can even install the package right from the python console
>>> pip install protobuf
After that you good to go ✌️

No module named 'absl' error when I import tensorflow

I have anaconda installed on my Win 7 machine with a GTX1070.
I have been trying to install tensorflow gpu version for the past hour with no luck. I followed the tutorials on the tensorflow website to no success. They ask for you to install CUDA 8.0 and Cudll 6.0 which I do. I then add the location of cudnn64_6.dll, cudart64_80.dll and the libnvvp folder to my path variables. I then set up a virtual environment in conda and run the following command:
(tensorflow)C:> pip install --ignore-installed --upgrade tensorflow-gpu
I believe when I do this, it installs tensorflow 1.5 which seems to require CUDA tools 9.0 because I get an error saying that cudart64_80.dll cannot be found. So I update my CUDA tools to 9.0 and download the corresponding Cuda library. I then change my path variables. Now I dont get any missing dll errors however, I am now faced with the following error
ModuleNotFoundError: No module named 'absl'
Does anyone have any suggestions as to what I can do from here on?

This was caused by a Python version issue for me. I had the absl package installed on my Python 2.x, but my Python 3.x didn't have it. So I just made sure that both Pythons on my machine had the package installed:
pip install absl-py
pip3 install absl-py

Here is how I solved it in my end.
I was getting the error even though absl-py was already installed.
When I used pip install absl-py I got the following error:
Requirement already satisfied: absl-py in c:\users\stack\appdata\local\programs\python\python38\lib\site-packages (0.9.0)
Requirement already satisfied: six in c:\users\stack\appdata\local\programs\python\python38\lib\site-packages (from absl-py) (1.15.0)
I fixed it by reinstalling, i.e. by using:
pip uninstall absl-py
pip install absl-py
Then I faced a similar error with wrapt:
ModuleNotFoundError: No module named 'wrapt'
Fixed wrapt as well by uninstalling and then installing it again.
pip uninstall wrapt
pip install wrapt

Try:
conda install tensorflow
conda install -c anaconda absl-py
This worked for me.
For more information see: https://anaconda.org/anaconda/absl-py

I was facing the same issues and pip (or pip3) install absl-py was not working.
python --version showed I was using the wrong python version (2.7). So I changed the python version to 3.5 (https://askubuntu.com/questions/320996/how-to-make-python-program-command-execute-python-3)
This worked for me.

You can use the Anaconda GUI to install absl-py pack to solve the problem:
Select the uninstall columnand search absl-py to apply it.

Try another version of absl-py. My default absl version is 0.8.1 and python is 3.6:
$pip install absl-py==0.8.0
works for me.
Or change my environment python version to 3.7 also works.

This is quite late but still worth posting. What they don't tell you on the NVidia website is that there is one more path you need to add to your environment variables. The path is;
c:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\extras\CUPTI\libx64
It may not be exactly the same on your installation as it depends on where you installed your CUDA tools.
You could also just use pip to install TF GPU version but pip installs TF 1.1 which is fairly old.

For me, "pip3 install absl-py" don't work:
I received: "ModuleNotFoundError: No module named 'absl' ", when I was trying import tensorflow:
import tensorflow
Traceback (most recent call last):
File "", line 1, in
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/init.py", line 22, in
from tensorflow.python import pywrap_tensorflow # pylint: disable=unused-import
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/python/init.py", line 63, in
from tensorflow.python.framework.framework_lib import * # pylint: disable=redefined-builtin
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/python/framework/framework_lib.py", line 25, in
from tensorflow.python.framework.ops import Graph
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/python/framework/ops.py", line 55, in
from tensorflow.python.platform import app
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/python/platform/app.py", line 24, in
from tensorflow.python.platform import flags
File "/opt/anaconda3/lib/python3.6/site-packages/tensorflow/python/platform/flags.py", line 25, in
from absl.flags import * # pylint: disable=wildcard-import
ModuleNotFoundError: No module named 'absl'
But if I compile absl-py from scratch, all goes right:
jk#D17:~/py/004/abseil-py-master$ python setup.py install
running install
running bdist_egg
running egg_info
.......
Using /opt/anaconda3/lib/python3.6/site-packages
Finished processing dependencies for absl-py==0.4.0
and then:
import tensorflow
is OK

Find the absl-py related folder in your site-packages folder and delete it. Try reinstalling pip3 install absl-py. I solved this way, I hope to be useful to you.

If you are using Anaconda make sure you install jupyter notebook from Home. if not you can import it from python CLI but it will give "No module named 'absl' error when importing TensorFlow"

In hopes that this might help someone in the future. I had similar issues installing/using tensorflow and by extension the absl python package. There were some issues relating to a pure pip installation so I had to find an alternate route.
This is the process I followed.
Download and install miniconda:
wget https://repo.continuum.io/miniconda/Miniconda3-3.7.0-Linux-x86_64.sh -O ~/miniconda.sh
bash ~/miniconda.sh -b -p $HOME/miniconda
add conda to PATH (Optional):
export PATH="$HOME/miniconda/bin:$PATH"
activate the conda environment:
source $HOME/miniconda/bin/activate
At this point you should have (base) as your sourced condo environment. From this environment perform the following:
conda create -n tensorflow python=3.7
activate tensorflow
Just to note, at this point you should be working in the (tensorflow) environment. It would have replaced the base environment. It is also the env where you would run your tensorflow related job (that failed and brought you here).
pip install --ignore-installed --upgrade tensorflow
pip install absl-py
At this point you might need to install additional dependencies such as numpy.
My goal was to be able to run tensorflow tools and this worked for my ends. Hope it may be useful to someone else in the future.

I got the No module named absl error when I tried to install tf-nightly 2.9.0.dev20220203 on my Ubuntu 20.04.3 machine.
Reinstalling absl-py did not directly worked.
While reinstalling absl, I got this error: ERROR: tf-nightly 2.9.0.dev20220203 has requirement gast<=0.4.0,>=0.2.1, but you'll have gast 0.5.3 which is incompatible.
So I uninstalled absl-py:
pip uninstall absl-py
Then downgraded gast:
pip uninstall gast
pip install gast==0.4.0
Finally,
pip install absl-py

Could not find a version that satisfies the requirement <package>

I'm installing several Python packages in Ubuntu 12.04 using the following requirements.txt file:
numpy>=1.8.2,<2.0.0
matplotlib>=1.3.1,<2.0.0
scipy>=0.14.0,<1.0.0
astroML>=0.2,<1.0
scikit-learn>=0.14.1,<1.0.0
rpy2>=2.4.3,<3.0.0
and these two commands:
$ pip install --download=/tmp -r requirements.txt
$ pip install --user --no-index --find-links=/tmp -r requirements.txt
(the first one downloads the packages and the second one installs them).
The process is frequently stopped with the error:
Could not find a version that satisfies the requirement <package> (from matplotlib<2.0.0,>=1.3.1->-r requirements.txt (line 2)) (from versions: )
No matching distribution found for <package> (from matplotlib<2.0.0,>=1.3.1->-r requirements.txt (line 2))
which I fix manually with:
pip install --user <package>
and then run the second pip install command again.
But that only works for that particular package. When I run the second pip install command again, the process is stopped now complaining about another required package and I need to repeat the process again, ie: install the new required package manually (with the command above) and then run the second pip install command.
So far I've had to manually install six, pytz, nose, and now it's complaining about needing mock.
Is there a way to tell pip to automatically install all needed dependencies so I don't have to do it manually one by one?
Add: This only happens in Ubuntu 12.04 BTW. In Ubuntu 14.04 the pip install commands applied on the requirements.txt file work without issues.

Although it doesn't really answers this specific question. Others got the same error message with this mistake.
For those who like me initial forgot the -r: Use pip install -r requirements.txt the -r is essential for the command.
The original answer:
https://stackoverflow.com/a/42876654/10093070

I had installed python3 but my python in /usr/bin/python was still the old 2.7 version
This worked (<pkg> was pyserial in my case):
python3 -m pip install <pkg>

This approach (having all dependencies in a directory and not downloading from an index) only works when the directory contains all packages. The directory should therefore contain all dependencies but also all packages that those dependencies depend on (e.g., six, pytz etc).
You should therefore manually include these in requirements.txt (so that the first step downloads them explicitly) or you should install all packages using PyPI and then pip freeze > requirements.txt to store the list of all packages needed.

Just a reminder to whom google this error and come here.
Let's say I get this error:
$ python3 example.py
Traceback (most recent call last):
File "example.py", line 7, in <module>
import aalib
ModuleNotFoundError: No module named 'aalib'
Since it mentions aalib, I was thought to try aalib:
$ python3.8 -m pip install aalib
ERROR: Could not find a version that satisfies the requirement aalib (from versions: none)
ERROR: No matching distribution found for aalib
But it actually wrong package name, ensure pip search(service disabled at the time of writing), or google, or search on pypi site to get the accurate package name:
Then install successfully:
$ python3.8 -m pip install python-aalib
Collecting python-aalib
Downloading python-aalib-0.3.2.tar.gz (14 kB)
...
As pip --help stated:
$ python3.8 -m pip --help
...
-v, --verbose Give more output. Option is additive, and can be used up to 3 times.
To have a systematic way to figure out the root causes instead of rely on luck, you can append -vvv option of pip command to see details, e.g.:
$ python3.8 -u -m pip install aalib -vvv
User install by explicit request
Created temporary directory: /tmp/pip-ephem-wheel-cache-b3ghm9eb
Created temporary directory: /tmp/pip-req-tracker-ygwnj94r
Initialized build tracking at /tmp/pip-req-tracker-ygwnj94r
Created build tracker: /tmp/pip-req-tracker-ygwnj94r
Entered build tracker: /tmp/pip-req-tracker-ygwnj94r
Created temporary directory: /tmp/pip-install-jfurrdbb
1 location(s) to search for versions of aalib:
* https://pypi.org/simple/aalib/
Fetching project page and analyzing links: https://pypi.org/simple/aalib/
Getting page https://pypi.org/simple/aalib/
Found index url https://pypi.org/simple
Getting credentials from keyring for https://pypi.org/simple
Getting credentials from keyring for pypi.org
Looking up "https://pypi.org/simple/aalib/" in the cache
Request header has "max_age" as 0, cache bypassed
Starting new HTTPS connection (1): pypi.org:443
https://pypi.org:443 "GET /simple/aalib/ HTTP/1.1" 404 13
[hole] Status code 404 not in (200, 203, 300, 301)
Could not fetch URL https://pypi.org/simple/aalib/: 404 Client Error: Not Found for url: https://pypi.org/simple/aalib/ - skipping
Given no hashes to check 0 links for project 'aalib': discarding no candidates
ERROR: Could not find a version that satisfies the requirement aalib (from versions: none)
Cleaning up...
Removed build tracker: '/tmp/pip-req-tracker-ygwnj94r'
ERROR: No matching distribution found for aalib
Exception information:
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/pip/_internal/cli/base_command.py", line 186, in _main
status = self.run(options, args)
File "/usr/lib/python3/dist-packages/pip/_internal/commands/install.py", line 357, in run
resolver.resolve(requirement_set)
File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 177, in resolve
discovered_reqs.extend(self._resolve_one(requirement_set, req))
File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 333, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "/usr/lib/python3/dist-packages/pip/_internal/legacy_resolve.py", line 281, in _get_abstract_dist_for
req.populate_link(self.finder, upgrade_allowed, require_hashes)
File "/usr/lib/python3/dist-packages/pip/_internal/req/req_install.py", line 249, in populate_link
self.link = finder.find_requirement(self, upgrade)
File "/usr/lib/python3/dist-packages/pip/_internal/index/package_finder.py", line 926, in find_requirement
raise DistributionNotFound(
pip._internal.exceptions.DistributionNotFound: No matching distribution found for aalib
From above log, there is pretty obvious the URL https://pypi.org/simple/aalib/ 404 not found. Then you can guess the possible reasons which cause that 404, i.e. wrong package name. Another thing is I can modify relevant python files of pip modules to further debug with above log. To edit .whl file, you can use wheel command to unpack and pack.

After 2 hours of searching, I found a way to fix it with just one line of command. You need to know the version of the package (Just search up PACKAGE version).
Command:
python3 -m pip install --pre --upgrade PACKAGE==VERSION.VERSION.VERSION

Below command worked for me -
python -m pip install flask

Not always, but in some cases the package already exists. For example - getpass. It is not listed by "pip list" but it can be imported and used:
If I try to pip install getpass I get the following error:
"Could not find a version that satisfies the requirement getpass"

Try installing flask through the powershell using the following command.
pip install --isolated Flask
This will allow installation to avoide environment variables and user configuration.

If you facing this issue at the workplace. This might be the solution for you.
pip install -U <package_name> --user --proxy=<your proxy>

Pip install from pypi.org.
pip install -U -i https://pypi.org/simple package

One possible error, pip package requires python intepreter which you are not using.
I ran into the same problem, it occurred only when I ran commands from my Docker image (or Dockerfile). Finally many hours later I managed to solve it by updating my python intepreter. Pointed out that my pip-package required python>=3,7 but my Docker image was using python 3.6.
Tip: To check out if you have similar problem, just check pip package requirements and your python version. Private pip package intepreter requirements are wrote down inside setup.py or setup.cfg. Public pip packages are usuially hosted in pypi.org where you can just check intepreter requirements with your browser. To check your python intepreter version just write for example python --version or python3 --version in your console
General problem description
As other answers point out there can also be other requirements that you are not satisfying and that is why pip can not found suitable package version for you. All the requirements are wrote down in pip package documentation and can be easily readed from https://pypi.org/project/graphene-django/your-package

I got this error while installing awscli on Windows 10 in anaconda (python 3.7).
While troubleshooting, I went to the answer https://stackoverflow.com/a/49991357/6862405 and then to https://stackoverflow.com/a/54582701/6862405. Finally found that I need to install the libraries PyOpenSSL, cryptography, enum34, idna and ipaddress. After installing these (using simply pip install command), I was able to install awscli.

When I lost my internet connection, I had this error.

Since it's a pretty annoying problem that may stuck beginners for a long period of time, here I write a complete guild.
if you are running pip install PACKAGE or python -m pip install PACKAGE, and a no matching version found error reported, here's how to solve the problem.
search your package on browser, for example my package is pycypto, here I search pycypto pypi
find your package, open the link on pypi, click download file
open a python shell, import any of your installed package, for example, I have installed Pillow before.
>>> import PIL
>>> PIL.__path__
['/Applications/MAMP/htdocs/canvas/src/zzd/env/lib/python3.7/site-packages/PIL']
PACKAGE.__path__ function will gives you the side packages path where all packages should go into.
PLUS:
if you have no idea what packages you installed before, run pip list to get a list of installed packages.
after we obtain the path, open a shell, cd to the path
cd /Applications/MAMP/htdocs/canvas/src/zzd/env/lib/python3.7/site-packages/
open
unzip the downloaded file, drag it into site-packages.
cd into the downloaded directory, and run setup.py to install
cd pycrypto-2.6.1
python setup.py install
Then you should be able to import and use the package in python.

Same error in slightly different circumstances, on MacOs. Apparently setuptools versions past 45 can expose some issues and this command got me past it:
pip3 install setuptools==45

If the package is local, don't miss the relative path.
E.g.
pip install ./<pkg>
finally worked in my case, while
pip install <pkg>
yielded:
ERROR: Could not find a version that satisfies the requirement <pkg> (from versions: none)
ERROR: No matching distribution found for <pkg>

I had a problem installing pandas-1.4.3, and the problem was my python patch version. pandas-1.4.3 required python version 3.8.13 and did not work with 3.8.9:
python install -r requirements.txt # or pip install pandas==1.4.3
# -> Could not find a version that satisfies...
conda activate my_project # creates a virtual env for a new python version
conda install python=3.8.13 # installing the new python version
python --version # displays 3.8.13
pip install -r python/requirements.txt
# -> pandas installed as expected

Search in google if you find some other version of that package available
use that for example
I was getting errors using the glob so I used glob2 instead

IPython notebook install error

I'm trying to install IPython notebook on OS X 10.10.2.
After all dependencies have been added, this error occurs:
File "/Library/Python/2.7/site-packages/jinja2/tests.py", line 14, in <module>
from jinja2._compat import text_type, string_types, integer_types
ImportError: cannot import name integer_types
How can I fix this?

How are you installing ipython?
If you have pip, are you using pip install ipython[all]?
I also recommend using virtualenv to start with a completely clean python2.7 install from scratch and see if you encounter the errors still. There may be some version compatibility conflicts on the system.
Alternative is you can install the Anaconda distribution which comes prepackaged with ipython and dependencies http://continuum.io/downloads