Develop Reference

ModuleNotFoundError: No module named 'flask_cors' on python anywhere

To state from the get go this is no criticism of pythonanywhere, but I want to run a script that used to work using the line:
from flask_cors import CORS
But I get the following error mesage:
ModuleNotFoundError: No module named 'flask_cors'
Then tried to install in my version of python:
pip3.9 install Flask-Cors
The result was:
Defaulting to user installation because normal site-packages is not
writeable Looking in links: /usr/share/pip-wheels Requirement already
satisfied: Flask-Cors in ./.local/lib/python3.9/site-packages (3.0.10)
Requirement already satisfied: Six in
/usr/local/lib/python3.9/site-packages (from Flask-Cors) (1.16.0)
Requirement already satisfied: Flask>=0.9 in
/usr/local/lib/python3.9/site-packages (from Flask-Cors) (2.0.0)
Requirement already satisfied: Werkzeug>=2.0 in
/usr/local/lib/python3.9/site-packages (from Flask>=0.9->Flask-Cors)
(2.0.1) Requirement already satisfied: itsdangerous>=2.0 in
/usr/local/lib/python3.9/site-packages (from Flask>=0.9->Flask-Cors)
(2.0.1 ) Requirement already satisfied: click>=7.1.2 in
/usr/local/lib/python3.9/site-packages (from Flask>=0.9->Flask-Cors)
(7.1.2) Requirement already satisfied: Jinja2>=3.0 in
/usr/local/lib/python3.9/site-packages (from Flask>=0.9->Flask-Cors)
(3.0.1) Requirement already satisfied: MarkupSafe>=2.0 in
/usr/local/lib/python3.9/site-packages (from
Jinja2>=3.0->Flask>=0.9->Flask-C ors) (2.0.1) 15:33 ~$ pip show
Flask-Cors
Name: Flask-Cors Version: 3.0.10 Summary: A Flask extension adding a decorator for CORS support Home-page:
https://github.com/corydolphin/flask-cors Author: Cory Dolphin
Author-email: corydolphin#gmail.com License: MIT Location:
/home/elksie5000/.local/lib/python3.9/site-packages Requires: Six,
Flask
What gives and how do I fix it?

I think you should try the following:
Go to your Bash Console in "Consoles" menu.
Open the bash control
Select your virtualenv:
For example my virtualenv name is flaskapp, I would wirte "workon
flaskapp" in the bash console.
Now type in your desired command
pip3.9 install flask-cors in your case (try in lower case)
Make sure you are working in the same virtualenv and the same python version
(I think you want to make an API using cors maybe)

what is the best way to solve some Python packages that could not installed by conda

Recently I am facing a embrassing problem is that some Python packages must install using pip. I have read the pip and conda difference:
What is the difference between pip and conda?
I think many people facing the same problem that when you choose conda, then some package could not using conda install, when you use pip install the pacakge, it could not imported into the local project because the project only could import pakcage installed by conda install command. For example I want to use eyeD3 to read the mp3 meta data, but the package could not installed by conda, I installed the package using pip but could not import in the PyCharm IDE. What is the best way to solve this conflict? Am I missing something? Or I have to switch to pip? is it possible to make conda could install package from pip? Any suggestion is welcome, I want to fetch a guidline. I have tried install package like this in the macOS Big Sur:
/usr/local/anaconda3/envs/pydolphin ⌚ 22:20:21
$ ./bin/python -m pip install eyed3 ‹ruby-2.7.2›
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Requirement already satisfied: eyed3 in ./lib/python3.9/site-packages (0.9.6)
Requirement already satisfied: filetype<2.0.0,>=1.0.7 in ./lib/python3.9/site-packages (from eyed3) (1.0.8)
Requirement already satisfied: coverage[toml]<6.0.0,>=5.3.1 in ./lib/python3.9/site-packages (from eyed3) (5.5)
Requirement already satisfied: deprecation<3.0.0,>=2.1.0 in ./lib/python3.9/site-packages (from eyed3) (2.1.0)
Requirement already satisfied: toml in ./lib/python3.9/site-packages (from coverage[toml]<6.0.0,>=5.3.1->eyed3) (0.10.2)
Requirement already satisfied: packaging in ./lib/python3.9/site-packages (from deprecation<3.0.0,>=2.1.0->eyed3) (21.3)
Requirement already satisfied: pyparsing!=3.0.5,>=2.0.2 in ./lib/python3.9/site-packages (from packaging->deprecation<3.0.0,>=2.1.0->eyed3) (3.0.6)
(base)
still could not import this pakacage in the PyCharm IDE. I could found the package from the env:
/usr/local/anaconda3/envs/pydolphin/lib/python3.9/site-packages/eyed3

Importing matplotlib gives error even though installed

I was hoping someone could help me out.
System is MacOS Catalina.
Python 3.8
IDE: VS
I installed matplotlib using pip install matplotlib which I saw stuck in under python2.7. I uninstalled matplotlib and reinstalled it using pip3 install matplotlib and received the following message:
Requirement already satisfied: cycler>=0.10 in /usr/local/lib/python3.7/site-packages (from matplotlib) (0.10.0)
Requirement already satisfied: numpy>=1.11 in /usr/local/lib/python3.7/site-packages (from matplotlib) (1.18.1)
Requirement already satisfied: pyparsing!=2.0.4,!=2.1.2,!=2.1.6,>=2.0.1 in /usr/local/lib/python3.7/site-packages (from matplotlib) (2.4.6)
Requirement already satisfied: kiwisolver>=1.0.1 in /usr/local/lib/python3.7/site-packages (from matplotlib) (1.1.0)
Requirement already satisfied: python-dateutil>=2.1 in /usr/local/lib/python3.7/site-packages (from matplotlib) (2.8.1)
Requirement already satisfied: six in /Users/apple/Library/Python/3.7/lib/python/site-packages (from cycler>=0.10->matplotlib) (1.13.0)
Requirement already satisfied: setuptools in /usr/local/lib/python3.7/site-packages (from kiwisolver>=1.0.1->matplotlib) (46.0.0)
However, when I try to run my .py file with 'import matplotlib' it gives this error:
import matplotlib as mpl
ModuleNotFoundError: No module named 'matplotlib'
I've tried searching different sources for the solution but I am now stuck.

You are mostly running your python script with the command python your_file.py, try running as python3 your_file.py in your terminal. pip3 installs packages under python3, not the default python2.
This is because I believe your mac terminal uses python 2.x by default, therefore the command python uses python 2.x version and python3 uses 3.x version that is available to execute the files. So if you want to install any packages under python 2.x you use pip as the command and to install packages under python 3.x you use pip3 as the command

Unable to import Preprocesing python

I am using spyder Anaconda. I am unable to import
from preprocessing import parse_annotation,BatchGenerator
I tried to install preprocssing using,
pip install preprocessing
got following error,
Requirement already satisfied: preprocessing in
c:\users\shahik\anaconda3\lib\site-packages (0.1.13)
Requirement already satisfied: nltk==3.2.4 in c:\users\shahik\anaconda3\lib\site-
packages (from preprocessing) (3.2.4)
Requirement already satisfied: sphinx-rtd-theme==0.2.4 in
c:\users\shahik\anaconda3\lib\site-packages (from preprocessing) (0.2.4)
Requirement already satisfied: six in c:\users\shahik\anaconda3\lib\site-packages
(from nltk==3.2.4->preprocessing) (1.10.0)
notebook 5.3.1 requires terminado>=0.8.1, which is not installed.
notebook 5.3.1 has requirement jupyter_client>=5.2.0, but you'll have jupyter-
client 5.0.1 which is incompatible.
notebook 5.3.1 has requirement jupyter_core>=4.4.0, but you'll have jupyter-core
4.3.0 which is incompatible.
Also tried to install from conda commands but failed. How can I solve these compatibility or other issues?

ImportError: No module named pyplot (even after installing matplotlib)

I am trying to import matplotlib like so:
import matplotlib.pyplot as plt
For this I have installed matplotlib using.
python -m pip install -U pip setuptools
python -m pip install matplotlib
Although the basic_example.py from the examples worked, it suddenly stopped running along with all other files with matplotlib giving me the below error:
File "matplotlib.py", line 2, in <module>
import matplotlib.pyplot as plt # pyplot module.
ImportError: No module named pyplot`
I tried to check if the module is still there, and it seems to be. What could be possibly wrong?
Requirement already satisfied: matplotlib in c:\python27\lib\site-packages
Requirement already satisfied: numpy>=1.6 in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: python-dateutil in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: cycler in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: pyparsing!=2.0.4,!=2.1.2,>=1.5.6 in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: pytz in c:\python27\lib\site-packages (from matplotlib)
Requirement already satisfied: six>=1.5 in c:\python27\lib\site-packages (from python-dateutil->matplotlib)`
I am using Windows and Python 2.7.

Python 2.7 tries to find modules in the current working directory first, before going into the installed packages, so because you named your test file "matplotlib.py", it will interpret it as the matplotlib package. Rename your test file to something else, and it should be fine