I have multiple python interperters in my computer 3.7 and 3.8. When I debug using with python 3.8 I do not face any issues using VSCode. My VScode python debugger fails when trying to debug with python 3.7. How do I install ctypes for python 3.7?
File "/home/kumar/.vscode/extensions/ms-python.python-2021.5.842923320/pythonFiles/lib/python/debugpy/launcher/../../debugpy/launcher/debuggee.py", line 8, in <module>
import ctypes
File "/usr/local/lib/python3.7/ctypes/__init__.py", line 7, in <module>
from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named '_ctypes'
Try pip uninstall ctypes, and then uninstall and reinstall ur python 3.7 and then try again pip install ctypes and then import ctypes in python interpreter.
ctypes is a built in library (I think from python2.5)
This means you dont need to install it, it is coming built in when you install python.
As far as using the correct version, see the pyenv module - it will make sure you are running the correct python version, and IMO makes life much easier
Have you checked which pip you are using? Make sure you have taken the right pip to install the package in the right place.
You can take pip --version command to check which pip you are using.
i installed python3.7 on ubuntu using ppa:deadsnakes/ppa repository.
When I try to run
import cmath
in python shell it fails with message:
ModuleNotFoundError: No module named 'cmath'
I didn't find any info about depracation of this library or anything in python3.7 changelog. It works fine in pythons 3.5 and 2.7. I tried installing it on different ubuntu virtual machines and computers and I always get the same result.
Do I need to install some specific library or something (which I doubt because the module is listed in standard library https://docs.python.org/3/library/index.html) or is problem elsewhere?
This was a bug in the deadsnakes backport of python3.7 specifically for xenial.
During the 3.7 beta period (when the package was imported). The cpython build system used PY_CORE_CFLAGS as a make variable. It was later changed to PY_STDMODULE_CFLAGS. debian ships a patch with their package that adjusts a generated makefile line using a sed expression for that specific variable. Since this was missing it caused the cmath module to build incorrectly.
This has been fixed in this commit
This fix is available in 3.7.0-1+xenial2 (debian version)
I installed python3.7 by downloading and installing it using make and cmath started working. It looks like ppa:deadsnakes/ppa repository had missing cmath module.
I tried to use the matplotlib package via Pycharm IDE on windows 10.
when I run this code:
from matplotlib import pyplot
I get the following error:
ImportError: No module named 'tkinter'
I know that in python 2.x it was called Tkinter, but that is not the problem - I just installed a brand new python 3.5.1.
EDIT: in addition, I also tried to import 'tkinter' and 'Tkinter' - neither of these worked (both returned the error message I mentioned).
For Linux
Debian based distros:
sudo apt-get install python3-tk
RPM based distros:
sudo yum install python3-tkinter
For windows:
For Windows, I think the problem is you didn't install complete Python package. Since Tkinter should be shipped with Python out of box. See: http://www.tkdocs.com/tutorial/install.html . Good python distributions for Windows can be found by the companies Anaconda or ActiveState.
Test the python module
python -c "import tkinter"
p.s. I suggest installing ipython, which provides powerful shell and necessary packages as well.
you can use
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
if you dont want to use tkinter at all.
Also dont forget to use %matplotlib inline at the top of your notebook if using one.
EDIT: agg is a different backend like tkinter for matplotlib.
For Windows users, there's no need to download the installer again. Just do the following:
Go to start menu, type Apps & features,
Search for "python" in the search box,
Select the Python version (e.g. Python 3.8.3rc1(32-bit)) and click Modify,
On the Modify Setup page click Modify,
Tick td/tk and IDLE checkbox (which installs tkinter) and click next.
Wait for installation and you're done.
On Centos, the package names and commands are different. You'll need to do:
sudo yum install tkinter
To fix the problem.
Almost all answers I searched for this issue say that Python on Windows comes with tkinter and tcl already installed, and I had no luck trying to download or install them using pip, or actviestate.com site. I eventually found that when I was installing python using the binary installer, I had unchecked the module related to TCL and tkinter. So, I ran the binary installer again and chose to modify my python version by this time selecting this option. No need to do anything manually then. If you go to your python terminal, then the following commands should show you version of tkinter installed with your Python:
import tkinter
import _tkinter
tkinter._test()
If you are using fedora then first install tkinter
sudo dnf install python3-tkinter
I don't think you need to import tkinter afterwards
I also suggest you to use virtualenv
$ python3 -m venv myvenv
$ source myvenv/bin/activate
And add the necessary packages using pip
On CentOS 7 and Python 3.4, the command is sudo yum install python34-tkinter
On Redhat 7.4 with Python 3.6, the command is sudo yum install rh-python36-python-tkinter
For windows users, re-run the installer. Select Modify. Check the box for tcl/tk and IDLE. The description for this says "Installs tkinter"
On Ubuntu, early 2018, there is no python3.6-tk on ubuntu's (xenial/16.04) normal distributions, so even if you have earlier versions of python-tk this won't work.
My solution was to use set everything up with python 3.5:
sudo apt install python3.5-tk
virtualenv --python=`which python3.5` python-env
source python-env/bin/activate
pip install -r requirements.txt
And now matplotlib can find tkinter.
EDIT:
I just needed 3.6 afterall, and the trick was to:
sudo apt install tk-dev
and then rebuild python3.6, after tk-dev, eg:
./configure
make
make install
If you are using python 3.6, this worked for me:
sudo apt-get install python3.6-tk
instead of
sudo apt-get install python3-tk
Which works for other versions of python3
For the poor guys like me using python 3.7. You need the python3.7-tk package.
sudo apt install python3.7-tk
$ python
Python 3.7.4 (default, Sep 2 2019, 20:44:09)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'tkinter'
>>> exit()
Note. python3-tk is installed. But not python3.7-tk.
$ sudo apt install python3.7-tk
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
tix python3.7-tk-dbg
The following NEW packages will be installed:
python3.7-tk
0 upgraded, 1 newly installed, 0 to remove and 34 not upgraded.
Need to get 143 kB of archives.
After this operation, 534 kB of additional disk space will be used.
Get:1 http://ppa.launchpad.net/deadsnakes/ppa/ubuntu xenial/main amd64 python3.7-tk amd64 3.7.4-1+xenial2 [143
kB]
Fetched 143 kB in 0s (364 kB/s)
Selecting previously unselected package python3.7-tk:amd64.
(Reading database ... 256375 files and directories currently installed.)
Preparing to unpack .../python3.7-tk_3.7.4-1+xenial2_amd64.deb ...
Unpacking python3.7-tk:amd64 (3.7.4-1+xenial2) ...
Setting up python3.7-tk:amd64 (3.7.4-1+xenial2) ...
After installing it, all good.
$ python3
Python 3.7.4 (default, Sep 2 2019, 20:44:09)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
>>> exit()
On CentOS 6.5 with python 2.7 I needed to do: yum install python27-tkinter
Sometimes (for example in osgeo4w distribution) tkinter is removed.
Try changing matplotlib backend editing matplotlibrc file located in [python install dir]/matplotlib/mpl-data/matplotlibrc changing The backend parameter from backend: TkAgg to something other like backend: Qt4Aggas described here: http://matplotlib.org/faq/usage_faq.html#what-is-a-backend
Since I'm using Python 3.7 on Ubuntu I had to use:
sudo apt-get install python3.7-tk
Maybe you installed python from source. In this case, you can recompile python with tcl/tk supported.
Complie and install tcl/tk from http://www.tcl.tk/software/tcltk/download.html, I'll suppose you installed python at /home/xxx/local/tcl-tk/.
# install tcl
wget -c https://prdownloads.sourceforge.net/tcl/tcl8.6.9-src.tar.gz
tar -xvzf tcl8.6.9-src.tar.gz
cd tcl8.6.9
./configure --prefix=/home/xxx/local/tcl-tk/
make
make install
# install tk
wget -c https://prdownloads.sourceforge.net/tcl/tk8.6.9.1-src.tar.gz
tar -xvzf tk8.6.9.1-src.tar.gz
cd tk8.6.9.1
./configure --prefix=/home/xxx/local/tcl-tk/
make
make install
Recompile python with tcl/tk supported, for example:
# download the source code of python and decompress it first.
cd <your-python-src-dir>
./configure --prefix=/home/xxx/local/python \
--with-tcltk-includes=/home/xxx/local/tcl-tk/include \
--with-tcltk-libs=/home/xxx/local/tcl-tk/lib
make
make install
I had the same issue on Win x86/64 because my custom Python3.7 installation did not include Tcl packages, so just modify or re-install your python
https://www.python.org/downloads/release/python-370/
Download Python Setup file and click modify then tick the tcl/tk and install.
After installation is complete go to folder where python is installed ( Default is C:\Users*Your username*\AppData\Local\Programs\Python\Python39\Lib) .
Copy the tkinter folder and paste it in the lib folder of your pycharm project.
Error should be resolved
Follow these steps to easily install Tkinter on your PyCharm IDE:
First go to the File:
Second is go to New Project Setup > Settings for new projects:
And then click the Settings for new projects and you'll get redirected in here:
Please click the + symbol in there:
after that install future and there you go...
If you’re having pip(which you probably do), open up cmd or powershell on Windows or a terminal window on OS X or Linux and try this(make sure python is in the system path if you’re on Windows):
pip install tkinter
It should take a while to install tkinter, and then try to execute this code block:
from tkinter import *
root = Tk()
# Your code goes here
root.mainloop()
Hope that this helps! Thank you!
I installed PyDev in Eclipse to run Python programs, but I’m facing trouble importing simplegui. It is showing me this error:
import simplegui
ImportError: No module named simplegui
My installed PyDev version is 2.7.1.
You can use SimpleGUICS2Pygame.
Just change
import simplegui
by
import SimpleGUICS2Pygame.simpleguics2pygame as simplegui
in your CodeSkulptor program and run it in standard Python
Did you learn Python using CodeSkulptor?
simplegui is a custom module for CodeSkulptor, meaning that it is only available in CodeSkulptor.
More information here.
I am using a Mac, when I installed simplegui off of the Python website, I had to import it as:
import simpleguitk
I also downloaded it through terminal with the command:
sudo pip install SimpleGUITk
Simple, download simplegui.zip form http://florian-berger.de/en/software/simplegui.
unzip simplegui-x.x.x.zip
cd simplegui-x.x.x
python setup.py install
Replace x.x.x with version number. You might want to run the last step with sudo rights.
My system: Mac OS X 10.6.8, gcc 4.2, python 2.7, xcode 3.2.3
I use python 2.7 and I got error when tried to do: import objc, it returns: ImportError: No module named objc.
It looks like the objc module is not there. But actually I have the objc module installed already. Snow Leopard has got pyobjc preinstalled and I have also checked this using python2.6 (I have python 2.7 and 2.6 in my Mac). So if I invoke import objc using python2.6, I got no error which means objc exists and I can use that module without problems ... but if I import using python 2.7, I will got the ImportError: No module named objc error.
Does anyone have any solution? FYI, the python2.6 is coming preinstalled with OS X while 2.7 is manually installed. I've been using the 2.7 for couple of months without problems.
Python C extension modules like objc cannot be re-used between python versions. You'll have to install the objc module for 2.7 separately.
Generally, different python installations (such as 2.6 or 2.7, or 3.2) use separate module import locations, and you normally install extensions per python setup.
In general, packages installed with one python installation are not available to other python installations. You can make them available by messing with sys.path (or by setting PYTHONPATH in your environment) and installing your modules to a common place, however, as pointed out by #MartijnPieters, if it is a C extension, you'll need to re-build the module for python 2.7 (and then you can't put it in a common place). Usually, this is as easy as:
<sudo> python2.6 setup.py install #install for python 2.6
<sudo> python2.7 setup.py install #install for python 2.7
since the command python is generally just a (soft) link to your preferred python installation.
sudo may or may not be necessary depending on where your python implementations live on your path.
This works for pure python modules too by the way. Since the source code generally doesn't take up too much space, this may be a good way to install all your modules if you'll be switching back and forth between python 2.6 and python 2.7.
The same thing goes if you're using easy_install to install your packages:
easy_install-2.6 somepackage
easy_install-2.7 somepackage