Develop Reference

no module named error after installing with pip

I am trying to import matplotlib library, which I have installed via cmd: pip install matplotlib. And it installed successfully. But when I try to import matplotlib in jupyter lab, it gives me an error:
---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)
<ipython-input-15-9738723f2bbd> in <module>
----> 1 import matplotlib as plt
2 from matplotlib import pyplot as pllt
ModuleNotFoundError: No module named 'matplotlib'
I checked both my python files and the installed matplotlib are in the same directory. Any ideas whats's wrong?

Sometimes happens that pip is installing the module for older python versions. Try to reinstall using pip3
Edit: as pointed out by MattDMo, on Windows they are both installed in the same folder. However, leaving this answer as this might be an issue in Linux.

ModuleNotFoundError Despite being Installed

I'm having trouble loading a package that is installed in my environment and have no idea why..
conda list
fbprophet 0.3.post2 py36_0 conda-forge
When I request for libraries installed in conda, it clearly shows that I have fbprophet installed. Now, when I import it, a ModuleNotFoundError exception is thrown.
from fbprophet import Prophet
---------------------------------------------------------------------------
ModuleNotFoundError Traceback (most recent call last)
<ipython-input-1-83be6864a7aa> in <module>()
----> 1 from fbprophet import Prophet
2 import numpy as np
3 import pandas as pd
ModuleNotFoundError: No module named 'fbprophet'
Has anybody run into this issue? What can I do to troubleshoot this?

My suggestion would be creating a virtual environment for your python first, then conda install your package in the virtual environment.

My script was reading from my pip install list where the module fbprophet did not exist. I went back and installed it there and everything worked. Lesson learned.
Always check where your libraries are being read from.

You may have more than one Python installation. Thus you might installed the library in one Python installation and tried to call it from another one. Please let me know if you have more than one Python installation by printing the result os this CMD command where python.

Error message when trying to import installed python package

I have python2.7 and python 2.6 installed in my VM and I pip install some libraries such as:
sudo pip install gsconfig
The installation is successful and I can see that the package is installed by:
pip list
My default system's python is 2.6. In the terminal I enter python and try to import the library as:
python
import gsconfig
And then I get an error:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named gsconfig
I also tried with python2.7 as:
python2.7
import gsconfig
I get the same error message. I can not understand why this is happening as I don't have with other packages this issue (e.g. simplejson).
Can it be that the location of the package is different?
When I try this:
which gsconfig
I get:
/usr/bin/which: no gsconfig in (/usr/lib64/qt-3.3/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin)
EDITED
Also when I go to the site-packages folder of python2.7 I can see that the package is installed.

It looks like the package name is not gsconfig, but is something else.
Looking at the documentation, I think it's geoserver.

python scikit error - no module named sklearn

When i follow the website (https://www.kaggle.com/wiki/GettingStartedWithPythonForDataScience) and type python makeSubmission.py I get the following error message :
ImportError: No module named sklearn
I think I have already successfully installed the following:
Python 3.4 for windows
sciPy,NumPy and matplotlib
setuptools
scikit-learn
PyCharm
I then opened "Python 3.4 command line" and typed import sys; print(sys.__path__),but I got the message
Traceback (most recent call last): File "<stdin>", line 1, in <module>
AttributeError: module object has no attribute '__path__'
Anyone can help?

Looks like you haven't installed scikit-learn properly. pip install -U scikit-learn should do the job. Also, I would suggest downloading the Anaconda distribution of python if you're planning to use python for kaggle contests. It takes care of all the necessary dependencies and contains all the commonly needed python packages for the contest. I found that easier than the tedious download of the dependencies. Here's the Link

The Ubuntu 14.04 package is named python-sklearn (formerly python-scikits-learn) and can be installed using the following command:
sudo apt-get install python-sklearn

If you are using PyCharm or any other IDE, then you have to install 'sklearn' separately in PyCharm tool too. In My Case I am using PyCharm, select
File Menu-> Default Settings-> Project Interpreter -> Press + button and type 'sklearn'
Press install button. Installation will be done in 10 to 20 seconds.
2nd option is if you already installed 'sklearn' using terminal then you have to set path in your PyCharm IDE.

Installing a package using pip or easy_install with ipython / conda

I'm trying to install 'frida' on my Anaconda environment, and although it installs fine, I keep getting an error when importing it from IPython:
In [4]: import frida
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
<ipython-input-4-58e5c65e5010> in <module>()
----> 1 import frida
ImportError: No module named frida
On the normal python shell the import works fine. The problem is only with IPython.
I've tried using easy_install from the conda command line - no go.
I've tried this from an IPython shell:
In [5]: easy_install.main( ["-U","frida"] )
And the package install successfully, but IPython still gave an error when importing it.
pip doesn't find the package.
I seem to be missing something with the IPython packages - How does one install packages to IPython?

If you are working in virtualenv, then installing IPython into virtualenv resolve such problems.
Usually, IPython is giving this advice when it start inside of virtualenv.