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Python 3: ModuleNotFoundError: No module named 'pandas.util' (raspberry pi)

Am having issues importing pandas on python3 on my raspberry pi. Whatever I try, I get the following error:
pi#raspberrypi:/ $ python3
Python 3.7.3 (default, Jul 25 2020, 13:03:44)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.7/dist-packages/pandas/__init__.py", line 22, in <module>
from pandas.compat import (
File "/usr/local/lib/python3.7/dist-packages/pandas/compat/__init__.py", line 15, in <module>
from pandas.compat.numpy import (
File "/usr/local/lib/python3.7/dist-packages/pandas/compat/numpy/__init__.py", line 7, in <module>
from pandas.util.version import Version
ModuleNotFoundError: No module named 'pandas.util'
It works fine on Python 2.7. I am getting errors with Python 3.7.3.
I searched Google and tried everything in the following post:
ImportError: No module named pandas
Some of the things I’ve tried are below - none have helped - I still get the error.
pip3 install pandas-util
pip3 install pandas.util
sudo apt-get install python3-wheel
sudo python3 -m pip install pandas
pip3 install pandas --upgrade
I've also tried uninstalling and reinstalling numpy and pandas - still get this error just with a basic import statement.
Any help would be appreciated as this is driving me insane!!
Cheers!

Try with
python3 -m pip install --force-reinstall pandas
This will ensure two things:
it will use the pip executable that belongs to the used Python executable, so that there is no accidental installation by another pip.
it will properly re-install Pandas.
Note that it doesn't re-download the Pandas package (it will use a cached version) if the version on PyPI hasn't changed between now and the previous installation. If that is a potential problem (incorrect cached file, for example), add the option --no-cache-dir to pip install.

Python 3.7 import requests returns "Chardet" error

When importing requests in python3, I'm getting the following error:
Python 3.7.0 (v3.7.0:1bf9cc5093, Jun 27 2018, 04:06:47) [MSC v.1914 32
bit (Intel)] on win32 Type "help", "copyright", "credits" or
"license" for more information
>>>> import requests
Traceback (most recent call last): File "<stdin>", line 1, in <module> File
"C:\Users\Administrator\AppData\Local\Programs\Python\Python37-32\lib\site-packages\requests-2.19.1-py3.7.egg\requests\__init__.py", line 44, in <module>
import chardet
ModuleNotFoundError: No module named 'chardet'
This is a fresh install, but because of the env I'm working in, I couldn't use pip to install requests. I had to download the source and install via the setup.py install file.
Doing some searches yields some results, but nothing that seems to be a solution for my situation.
Thanks

It is a dependency and is missing from you site-packages. Since you said you can't use pip you have to install the dependencies manually.
requires = [
'chardet>=3.0.2,<3.1.0',
'idna>=2.5,<2.8',
'urllib3>=1.21.1,<1.24',
'certifi>=2017.4.17'
]
this is what requests setup files mentioned as requirements for requests. Try installing all of these and try again.
hope this helps!

Try installing chardet module using this command:
pip3 install chardet

matplotlib works with default python but not python3.5 on debian

I have this issue. I think it's best described when I show you my bash commands that I used to produce the problem. See here:
josch#oogway:~$ python
Python 2.7.9 (default, Jun 29 2016, 13:08:31)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
>>> #works
josch#oogway:~$ python3.5
Python 3.5.0 (default, Apr 26 2017, 21:03:53)
[GCC 4.9.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import matplotlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'matplotlib'
>>> #what??
Matplotlib was installed by:
sudo apt-get install python-matplotlib
The "default" python came with my OS installation, python3.5 was downloaded and then compiled/installed from source.
Can anyone help? Tried to solve it myselve for 2 hours now but google can't find answer
Edit: I'm trying to install a "second pip" that works with my second installation of Python, which is Python3.5. My default-Python that is managed by the OS is Python 2.7.9. Now, as suggested I did:
joschua#oogway:~/Downloads$ wget https://bootstrap.pypa.io/get-pip.py
and then:
python3.5 get-pip.py
which gave me:
joschua#oogway:~/Downloads$ python3.5 get-pip.py
Traceback (most recent call last):
File "get-pip.py", line 20061, in <module>
main()
File "get-pip.py", line 194, in main
bootstrap(tmpdir=tmpdir)
File "get-pip.py", line 82, in bootstrap
import pip
zipimport.ZipImportError: can't decompress data; zlib not available

Try installing pip3 with:
sudo apt-get install python3-pip
and then try installing matplotlib with:
sudo pip3 install matplotlib

I actually could solve the problem now.
See this link for a reasonable description on how to run two different versions of python on the same system (and as #Pierre de Buyl suggested) use two different pip versions on the same system
https://www.linkedin.com/pulse/20140815081557-89781742-how-to-install-and-use-python-with-different-versions-on-same-linux-machine

So, you installed python3.5 from source. What version of Debian are you using? (I suppose Jessie).
If you want to install packages for this Python interpreter, you must have a pip that actually uses it. Two solutions:
It is installed. If so,
python3.5 -m pip
will work and you can install packages with
python3.5 -m pip install matplotlib
or
python3.5 -m pip install --user matplotlib
It is not installed. You must install it following the instructions at https://packaging.python.org/installing/#requirements-for-installing-packages
apt-get will not install the appropriate pip for your needs. It will only install a pip that is related to the python3 (3.4 for jessie I believe) that is also in the apt-get system.
EDIT: in light of the update, you need also to re-compile python3.5 with zip enabled.

No module found in my python

I tried to read all the issues concerning the python's error
ImportError: No module named
I reinstalled all the modules I need using
sudo apt-get install build-essential python-dev python-setuptools python-numpy python-scipy libatlas-dev libatlas3gf-base
I also upgraded using pip
sudo pip install --upgrade numpy
sudo pip install --upgrade scipy
When runing pip list I get
matplotlib (1.3.1)
scipy (0.17.0)
numpy (1.11.0)
But here is the execution result :
>>> import matplotlib
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named matplotlib
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/dist-packages/numpy/__init__.py", line 153, in <module>
from . import add_newdocs
File "/usr/lib/python2.7/dist-packages/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/usr/lib/python2.7/dist-packages/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/usr/lib/python2.7/dist-packages/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/usr/lib/python2.7/dist-packages/numpy/core/__init__.py", line 6, in <module>
from . import multiarray
ImportError: /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so: undefined symbol: PyUnicodeUCS4_AsUnicodeEscapeString
I don't know what's happening! please help!!
OS ubuntu14.04
NEW EDIT
So some news: I checked out the install of python and I found different versions in different places. In the python2.7 case I have :
/usr/bin/python2.7
/usr/local/bin/pyton2.7
While using which I get
which python
/usr/local/bin/python
But the /usr/bin/python2.7 works really fine
cd /usr/bin
./python2.7
Python 2.7.6 (default, Jun 22 2015, 17:58:13)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import scipy
>>> import numpy
>>> import matplotlib
>>>
Thanks

This happens when the package has C extensions and they were compiled for an interpreter which does not fit the Python version you're trying to run it with.
(assuming you're running on Linux/OS X)
You can try using a virtualenv to install the package for the current Python version you're running:
pip install virtualenv
virtualenv my_env
source my_env/bin/activate
pip install numpy
Or you can directly provide the explicit path to the Python version with which you installed numpy.
Note that /usr/lib/python2.7/dist-packages/numpy/core/multiarray.so is the C extension which failed to load which indicates the problem.
Also see Conflicting versions of python in ubuntu for how to compile Python for your needs.

Install matplotlib like this if pip3 install didn't work for you
sudo apt-get install python3-matplotlib
Note - before doing check inside site-packages are present or not locate python using
which python

I can't find python package fftw3

I'm trying to use fftw3 on python to compute ffts really fast (using all my cores!)
The problem is... I can't find the fftw3 package for python...
I know it exists because the function I need uses it if and only if it's installed.
This is the module that I use: https://github.com/keflavich/image_tools/blob/master/fft_psd_tools/convolve_nd.py
And as expected this is what I get if I try to import it:
>>> import fftw3
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named fftw3
>>>
And I've tried this:
sudo pip install fftw3
sudo apt-get install python-fftw3
sudo easy_install fftw3
And I have also tried googling for its location, or installation instructions, with nothing to be found!
I am also aware that fftw is a C library and that pyfftw exists as python wrappers for that package, but the function I use utilizes fftw3.
I am hoping someone could point me to where this module is located!
P.S. I am running Ubuntu 14.04 and I'm using python 2.7. I also tried importing it in python 3 but it's not there either.

Looks like the problem was with the package you were trying to pip. I had no errors with sudo pip install pyfftw3 then import fftw3
will#will-mint2 ~ $ sudo pip install pyfftw3
[sudo] password for will:
Downloading/unpacking pyfftw3
Downloading PyFFTW3-0.2.1.tar.gz
...
Successfully installed pyfftw3
Cleaning up...
will#will-mint2 ~ $ python
Python 2.7.9 (default, Mar 1 2015, 12:57:24)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import fftw3
>>> exit()

For windows
http://www.lfd.uci.edu/~gohlke/pythonlibs/#pyfftw
install it by:
pip install [filename].whl
import in your code by
import pyfftw as fftw