I have a MacBook Pro M1 running on Big Sur with python 3.8, Matlab R2020b. Both running under rosetta2 perfectly fine.
Since I need to use one Matlab function, that I have in an python Script of me, I wanted to use Matlab.engine in my python script and followed the instructions with sudo privileges and python3 instead of python on:
https://www.mathworks.com/help/matlab/matlab_external/install-the-matlab-engine-for-python.html
Then I entered python3 in the terminal and tried import matlab.engine which resulted in the error: No module named 'matlab.engine'; 'matlab' is not a package
My .zshrc file contains the Path to my Python. I tried export PATH="/Users/flo/Library/Python/3.8/bin:$PATH"and as that didn't work I also tried export PATH="/Library/Python/3.8:$PATH"
Matlab is also on my path, as I can call matlab from terminal and it starts, as expected. It's just the matlab.engine That I can't get running.
Since the only thing, that I want to achieve by it, is calling a script, containing a function with 2 input and 7 output arguments (which I need in python for further calculations), is there another way to do it without the need of matlab.engine, in case I can't get it running?
Oh dear, I could resolve the issue, that I had for quite some days, some minutes after posting the question..
It seems, I did the pip3 install matlab some weeks/months ago and didn't remember. When I tried to import matlab.engine, python thought, I want to import engine from the installed matlab from pip. And that's why I got the error, that matlab is not a package.
Simply do pip3 uninstall matlab resolved this issue for me!
Hope, this helps other people save the days, that I wasted with such a silly error..
Related
I have installed Python 3.10.6 and Pycharm community edition.
Everything was working until I tried to use numpy.
pip3 install numpy
import numpy as np
This is the error message:
pip3 install numpy
^^^^^^^
SyntaxError: invalid syntax
I also have tried to use pip install numpy and pip2 install numpy and pip3 install numpy scipy, but same error. Reinstalling both python and pycharm didn't help.
Ah, I understand your problem more specifically now. I also use PyCharm, and this same problem happened to me. It was very frustrating, and took me lots of reading to fix it.
PyCharm and other IDEs (integrated development environment) have something called 'run configurations' attached to each file you are working on. These run configurations basically specify which directory on the hard drive the file will use to read and execute your commands. The directory will contain the libraries you need to run your code.
They use these configurations to make it easy to quickly choose which directory (and which libraries) you want a certain file to use. You must specify these configurations in PyCharm for your specific file to run using Numpy. The great thing about PyCharm is that you can actually specify libraries you want to use within the IDE itself (and bypass having to specify a computer-native directory).
Here's How
Go to PyCharm Preferences
Expand the arrow that says 'Project: (your project name)'
Click on 'Python Interpreter'
Click the small '+' symbol
Type in 'numpy' to search for the library (package)
Click install package
Now try to run your file and it should be good to go!
Note that you must do this for each package you wish to use when accessing your file, and as you advance your programming knowledge it will be necessary to learn how to specify the directory you want PyCharm to run the Python Interpreter from. Since you are only using one library though, I think this solution should be fine for the time being.
You should install numpy with that command in your bash/zsh shell.
pip3 install numpy
the python script can then import it.
to test, run pip3 install numpy
then,
python to open a python shell.
and then you'll see
>>>
Type import numpy as np and be sure it imports. It should now.
It can be maddeningly confusing when first starting out with python and trying to figure out how to download libraries. Here are a few critical things I wish I understood before starting my Python journey, as well as the answer to your question.
Python is the language, and the files that support its functionality are located on the hard drive.
Libraries (like Numpy) can be thought of almost as interpreters (note that we are not using the computer definition of 'interpreter') and are stored alongside the Python files on the hard drive. They give Python more flexibility in terms of what it is able to do by increasing what commands Python is able to understand.
Once a library is downloaded, it must be imported to your Python script before you start writing library-specific commands. Importing a library tells Python: "Hey, I'm going to be writing some commands that you haven't seen before, but here is the library with the commands and what they want you to do in a way that you understand."
'pip' is Python's installer for these libraries.
Ex) I have a csv file that I want to read. I learn that Pandas has a csv reader function:
pandas.read_csv()
If I were to type this function in a script, Python would have no idea what I meant. But if I were to download Pandas, then import it into my script, Python would understand exactly what I'm saying.
How to Download Numpy
Assuming you are on Windows, open the terminal (command prompt) and run the command:
py -m pip install numpy
If you don't already have it, the terminal should have a few lines run and should end with something like 'numpy installed successfully'.
You can check to see if you have it by running the following command in your terminal:
py -m pip list
This command provides you with a list of all the downloaded libraries. You can check among them to make sure Numpy is downloaded.
Importing Libraries
Once you've downloaded the libraries you need, you need to import them into your script (the Python file where you are writing your code) in order for it to run properly. This is accomplished using the import command. One important thing to note is that you can import libraries and assign them a nickname using the as modifier.
Ex) Back to that csv file I want to read. I don't want to type 'pandas' in front of all the Pandas commands, so when I import it into the script I abbreviate it as 'pd':
import pandas as pd
pd.read_csv()
See the difference?
TL;DR for Your Scenario
Go to the terminal, and use the py -m pip list command to check if you have Numpy downloaded. If not, run the py -m pip install numpy command. Then go to your script with your actual python code, and import numpy with the import numpy command. Common Python practice is to import numpy as np, FYI.
Hope this clears things up.
It may say that you need to upgrade pip, which is fine, and it should give you a command to run that will upgrade pip to the newest version.
I'm using Anaconda. I created an environment called ENGINEERING. In than environment I installed python 3.6, pandas 1.1.3, spyder 3.3.6, numpy 1.19.2, and many more. The base environment has these packages also but not necessarily the same version. Within the ENGINEERING env I created a python script in Spyder that runs without any issues when I run it in spyder. Then, I want to automate that script by creating a .bat file and then using that to automate via windows task scheduler. My .bat looks like this:
"C:\Users\alopo000\Anaconda3\envs\engineering\python.exe" "C:\Users\alopo000\Files\Python\Valid\Portf.py"
pause
when I run the .bat I get an error message:
ImportError: Unable to import required dependencies:
numpy:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the numpy C-extensions failed. This error can happen for
many reasons, often due to issues with your setup or how NumPy was
installed.
We have compiled some common reasons and troubleshooting tips at:
https://numpy.org/devdocs/user/troubleshooting-importerror.html
Please note and check the following:
* The Python version is: Python3.6 from "C:\Users\alopo000\Anaconda3\envs\engineering\python.exe"
* The NumPy version is: "1.19.2"
and make sure that they are the versions you expect.
Please carefully study the documentation linked above for further help.
Original error was: DLL load failed: The specified module could not be found.
I've tried many things to fix this. I went to the website they suggested and couldn't find anything there. I uninstalled pandas and numpy and reinstall them again but still, same error. The one thing I haven't tried is to fix the VARIABLE PATHS, mostly because I've read in many places not to change those. I can change them if that's what it is, but I would like to understand first why it is not recommended. I read it can create issues with other versions of python but not sure if that's what it is.
Do I need to activate the environment in the .bat file? is the problem that the .bat file is trying to run it outside the environment? Any help would be appreciated.
You will need to upgrade/change your base Python & numpy version installations to match those specified (3.6, 1.19.2). I had the same issue and same situation as OP (write/dev program in a virtual Spyder environment "spyder-env", then automate .py file with WTS). I tried copying over & running the 'activate.bat' in the /scripts/ folder of the virtual environment but that didn't work. In my situation, my conda spyder-env was Python = 3.9.12 and numpy = 1.21.5.
I ended up upgrading my base global Python version (conda install) for Python which changed from 3.8.3 and did the same with numpy (had to downgrade). I'm not sure if this is exactly necessary, why this works, or if it may cause problems down the line (I was about to just re-install conda).
The appropriate .bat file should be something like this once you do that:
call "C:\Users\alopo000\Anaconda3\Scripts\activate.bat"
call "C:\Users\alopo000\Files\Python\Valid\Portf.py" %*
REM Uncomment below to debug
REM pause
I'm having a problem with importing modules in python.
When I run my program in the command line it works perfectly fine.
However, when I try to run the same program in the python shell I am prompted with the following error:
ModuleNotFoundError: No module named 'matplotlib'
I already successfully installed matplotlib using 'python -m pip install matplotlib'.
I've read this can happen when you have two different versions of python installed; however, I don't.
I've uninstalled and reinstalled python and I still am having the same issue. I've also uninstalled and reinstalled matplotlib using pip.
I believe my problem is the module paths that python uses to search for imported modules are different between the two.
When I use the 'print(sys.path)' command in the python shell and the command line I get two different outputs.
Any help would be greatly appreciated!!!
The file different system paths between the python shell and the command line
You have two versions of python. I would recommend you to remove all pythons you have and go for anaconda https://www.anaconda.com/distribution/. It will fix your path problems and allow you to create environments with different versions of python. This is the least painful way also for future :) good luck.
I suppose, you have both of the Python versions installed on the same computer.
If that is so, then my answer would be to go inside both Python script folders and install matplotlib on both of them.
I have also faced that issue. My path includes pip of Python 3.7.1 and whenevwer I try to import modules on Python 3.4. It throws an error!
Maybe, you could add both of the Pythons to the path.
I encountered this same problem – python -c "import sklearn" would work just fine, but import sklearn inside a Python program failed. Both my one-liner and program was using the same Python version (version 3.8.10).
I eventually got the program to work by replacing the shebang line (originally #!/usr/bin/python) with #!/bin/env python.
I don't know why this worked exactly (sorry). Presumably some path got reset, and the module loaded from a different location, but it might help someone so I'm posting it here nontheless. (If you know more, feel free to edit this answer.)
I know this question has been asked few times, however, none of those solutions worked for me, so I thought of reposting the question in my context.
I have downloaded IDLE and Python2.7, and trying to run a python script. The above error is shown. I have verified that numpy is present somewhere in my comp., and I also tried adding 'path' (systems-advanced setting-environmental variables...), however, none of them worked.
Specific question is, is there a way I can install numpy from IDLE?.
Any inputs would greatly help to advance Science!.
Best,
Raman
As some of your comments above stated, you have not actually installed NumPy, as NumPy does not come with the base package of Python. My suggestion is to look into python package such as Anaconda or WinPython (only for windows) because these packages come preinstalled with your main python modules (Numpy, SciPy, etc..)
BUT, to just install NumPY, either open your command prompt or a bash shell you should be able to run,
pip install numpy
If you dont have the command pip just run,
python get-pip.py
I'm currently doing the exercise in "Learn python the hard way".
In this exercise i have to install the lpthw.web frame work.
Having installed pip in windows, i open my terminal and hit
pip install lpthw.web
Everything then ends succesfully.
But when i browse C:\Python27\Lib\site-packages\lpthw.web-1.1-py2.7.egg-info and check the installed-files text i can't see the web.py.
Consequently when i try to import it in a simple script i get ImportError.
I don't have python 3 installed as book suggested for possible cause, so i don't know how to work around it.
Any suggestion?
I checked my path
import sys
sys.path
and saw that every single line was using the panda3d path.
As i was not really using it, unistalling it fixed my problem.
For me it was python version control on raspberry pi
(linux) 2.7 is default and does not work.
follow:
https://learn.sparkfun.com/tutorials/python-programming-tutorial-getting-started-with-the-raspberry-pi/configure-your-pi
have other errors now but the import web loads in python.
cheers!