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Can't import Pyomo in Jupyter Notebook

I'm trying to import pyomo in Jupyter Notebook, I ran the following code:
!pip3 install pyomo
import pyomo
THEN it came back:
Requirement already satisfied: pyomo in /Users/*/Library/Python/3.8/lib/python/site-packages (5.7.3) Requirement already satisfied: PyUtilib>=6.0.0 in /Users/*/Library/Python/3.8/lib/python/site-packages (from pyomo) (6.0.0)
Requirement already satisfied: six>=1.4 in /Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/site-packages (from pyomo) (1.15.0) Requirement already satisfied: ply in /Users/*/Library/Python/3.8/lib/python/site-packages (from pyomo) (3.11)
Requirement already satisfied: nose in /Users/*/Library/Python/3.8/lib/python/site-packages (from PyUtilib>=6.0.0->pyomo) (1.3.7)
WARNING: You are using pip version 19.2.3, however version 21.0.1 is available. You should consider upgrading via the 'pip install --upgrade pip' command. --------------------------------------------------------------------------- ModuleNotFoundError Traceback (most recent call last) <ipython-input-5-7105a3440ba3> in <module> 1 get_ipython().system('pip3 install pyomo') ----> 2 import pyomo
ModuleNotFoundError: No module named 'pyomo'
I think I already installed pyomo, but when I try to import the module, it cannot be found.
Please someone helps to resolve this issue.

import pyomo doesnt work. as written in the doc you should use this package like:
from pyomo.environ import * or like:
import pyomo.environ

'ModuleNotFoundError' after installing the packages

I am using a module for a work called cryptography and tried to install it via:
C:\Users\Administrator\Desktop>python -m pip install cryptography
Here is a copy of the cmd window:
Collecting cryptography
Using cached cryptography-3.2-cp38-cp38-win32.whl (1.3 MB)
Requirement already satisfied: six>=1.4.1 in c:\users\administrator\appdata\roaming\python\python38\site-packages (from cryptography) (1.15.0)
Requirement already satisfied: cffi!=1.11.3,>=1.8 in c:\program files (x86)\python38\lib\site-packages (from cryptography) (1.14.3)
Requirement already satisfied: pycparser in c:\program files (x86)\python38\lib\site-packages (from cffi!=1.11.3,>=1.8->cryptography) (2.20)
Installing collected packages: cryptography
Successfully installed cryptography-3.2
Then when I tried using the program it just did not work:
C:\Users\Administrator\Desktop>main.py
Traceback (most recent call last):
File "C:\Users\Administrator\Desktop\ape esse\main.py", line 3, in <module>
from cryptography.fernet import Fernet
ModuleNotFoundError: No module named 'cryptography'
It gives the same error, as if not installed, and I don't know what to do.
One of my friends said it was a problem with my python installation but I've already repaired and reinstalled it and it still gives the same error.

I installed it now using
pip install cryptography --no-cache-dir and it worked perfectly fine on python 3.8.5.
so you might want to try it.

ModuleNotFoundError- Requests (despite installation attemps showing "requirement already satisfied")

When I run the code below to attempt to import a few of the usual Python libraries for API interaction... I get a ModuleNotFoundError on the import line of code.
I verified that it is indeed installed on my machine via pip3. I then tried uninstalling it and reinstalling it. When that didn't work I tried running the installation as a shell command in my Jupyter notebook. The same errors persisted.
Please note: what I am referring to as "it" is either the requests or json library for Python; I am encountering the same errors with each.
#right on the import line is where the error happens, the code is simple though...
import requests
import json
Here is the traceback...
ModuleNotFoundError Traceback (most recent call last)
<ipython-input-2-021831bd5cc5> in <module>
1 # Dependencies
2 get_ipython().system(' pip3 install requests')
----> 3 import requests
4 import json
ModuleNotFoundError: No module named 'requests'
And here is the "requirement already satisfied" statement from Terminal...
(base) Computer:~ User$ pip3 install requests
Requirement already satisfied: requests in ./anaconda3/lib/python3.7/site-packages (2.22.0)
Requirement already satisfied: idna<2.9,>=2.5 in ./anaconda3/lib/python3.7/site-packages (from requests) (2.8)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in ./anaconda3/lib/python3.7/site-packages (from requests) (3.0.4)
Requirement already satisfied: certifi>=2017.4.17 in ./anaconda3/lib/python3.7/site-packages (from requests) (2019.6.16)
Requirement already satisfied: urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 in ./anaconda3/lib/python3.7/site-packages (from requests) (1.24.2)

Sorry I’ve reputation to comment.
Pleas look at your env where you install the package.
You’re running on base environment maybe you’re using Anaconda, and then run Python without that environment. So the package won’t be seen bye your editor or terminale.
Could you add more information on where you use python?

I was facing the same problem on mac OSX, when I did "pip install requests", then I installed with "sudo" and it worked.
On OSX/Linux :
Use $ sudo pip install requests if you have pip installed.
Alternatively you can also use sudo easy_install -U requests if you have easy_install installed.
For centOS: yum install python-requests
Reference: [ImportError: No module named requests

ImportError: No module named attr

I have only very rudimentary experience in Python. I am trying to install the package pyslim (see here on the pypi website). I did
$ pip install pyslim
Requirement already satisfied: pyslim in ./Library/Python/2.7/lib/python/site-packages/pyslim-0.1-py2.7.egg (0.1)
Requirement already satisfied: msprime in /usr/local/lib/python2.7/site-packages (from pyslim) (0.6.1)
Requirement already satisfied: attrs in /usr/local/lib/python2.7/site-packages (from pyslim) (16.3.0)
Requirement already satisfied: svgwrite in /usr/local/lib/python2.7/site-packages (from msprime->pyslim) (1.1.12)
Requirement already satisfied: jsonschema in /usr/local/lib/python2.7/site-packages (from msprime->pyslim) (2.6.0)
Requirement already satisfied: six in /usr/local/lib/python2.7/site-packages (from msprime->pyslim) (1.10.0)
Requirement already satisfied: numpy>=1.7.0 in /usr/local/lib/python2.7/site-packages/numpy-1.10.4-py2.7-macosx-10.11-x86_64.egg (from msprime->pyslim) (1.10.4)
Requirement already satisfied: h5py in /usr/local/lib/python2.7/site-packages (from msprime->pyslim) (2.8.0)
Requirement already satisfied: pyparsing>=2.0.1 in /usr/local/lib/python2.7/site-packages (from svgwrite->msprime->pyslim) (2.2.0)
Requirement already satisfied: functools32; python_version == "2.7" in /usr/local/lib/python2.7/site-packages (from jsonschema->msprime->pyslim) (3.2.3.post2)
But when I open python and try to import pyslim, it fails
> import pyslim
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Users/remi/Library/Python/2.7/lib/python/site-packages/pyslim-0.1-py2.7.egg/pyslim/__init__.py", line 4, in <module>
from pyslim.slim_metadata import * # NOQA
File "/Users/remi/Library/Python/2.7/lib/python/site-packages/pyslim-0.1-py2.7.egg/pyslim/slim_metadata.py", line 1, in <module>
import attr
ImportError: No module named attr
So, I did
$ pip install attr
Requirement already satisfied: attr in /usr/local/lib/python2.7/site-packages (0.3.1)
and
$ pip install attrs
Requirement already satisfied: attrs in /usr/local/lib/python2.7/site-packages (16.3.0)
I restarted python and tried to import pyslim again but I keep receiving the same error message. I also tried to download and install the files from github by doing
$ git clone https://github.com/tskit-dev/pyslim.git
$ cd pyslim
$ python setup.py install --user
as indicated here on the pypi website. On this last line of code, I get a long output ending with
Download error on https://pypi.python.org/simple/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) -- Some packages may not be found!
No local packages or download links found for attrs
error: Could not find suitable distribution for Requirement.parse('attrs')
I am using Python 2.7.10 on a MAC OSX 10.11.6. Not sure if it matter but I usually install things with homebrew. I am using pip 18.1 from /usr/local/lib/python2.7/site-packages/pip (python 2.7).
Edit
$ which python
/usr/bin/python
$ which pip
/usr/local/bin/pip

Take a look to this other question that is related to the attrs package.
In your case, you have attr and attrs installed at the same time, and they are incompatible between them, so python is unable to resolve the package name on the import correctly.
You should use attrs only, so try uninstalling attr and try it again:
python -m pip uninstall attr
If, in the future, you need to have some packages incompatibles between them, take a look about using virtual environments in Python, which are really easy to use and will be very useful to play with packages and packages versions without break anything.

First uninstall pyslim. Use "pip uninstall pyslim". Then try installing again using
"conda install -c conda-forge pyslim"
Refer https://anaconda.org/conda-forge/pyslim

Python 3 can't use installed packages

After installing the ics package with pip3 in my terminal on Mac OS High Sierra. I can't use this package in Python 3.6. I installed it by using:
pip3 install --user ics
When doing this again, I get the following message:
Requirement already satisfied: ics in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
Requirement already satisfied: six>1.5 in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from ics)
Requirement already satisfied: arrow==0.4.2 in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from ics)
Requirement already satisfied: python-dateutil in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from ics)
But when I try to run a script using:
python3 test.py
I get the following error:
from ics import Calendar, Event
ImportError: cannot import name 'Calendar'
The test.py file just contains an import of the package:
from ics import Calendar, Event
c = Calendar()
It is not the first time that I can't use an installed package with Python 3 on my Mac. I looked at a couple of solutions, like updating the .bash_profile file, but that already pointed at the correct Python version I was using.
# Setting PATH for Python 3.6
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"
export PATH
This issue is frustrating me for days right now and I can't seem to find any solution..