python 2.7 functools_lru_cache does not import although installed

Question

When I try to import matplotlib I get an error

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/__init__.py", line 128, in <module>
  from matplotlib.rcsetup import defaultParams, validate_backend, cycler
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/rcsetup.py", line 29, in <module>
    from matplotlib.fontconfig_pattern import parse_fontconfig_pattern
  File "/usr/local/lib/python2.7/dist-packages/matplotlib/fontconfig_pattern.py", line 32, in <module>
    from backports.functools_lru_cache import lru_cache
ImportError: No module named functools_lru_cache

backports itself imports properly. When I try to install functools manually via

sudo pip install backports.functools_lru_cache

I get info that

Requirement already satisfied: backports.functools_lru_cache in /usr/local/lib/python2.7/dist-packages

Nevertheless when i try to

import backports.functools_lru_cache

I get info that

ImportError: No module named functools_lru_cache

System info Ubuntu 16 Python 2.7.12 Pip 9.0.1

score 40 · Answer 1 · answered Mar 17 '18 at 12:23

40

If someone is still having that problem and reinstalling backports.functools_lru_cache do not work in his case, as it was in my case, then probably installing older version of matplotlib would work. For example:

pip install matplotlib==2.0.2

Problem occurred for version 2.2.0, I switched to 2.0.2 and it is working now. I did not check other versions.

answered Mar 17 '18 at 12:23

Skoskm

533
5
10

3

I had the same problem after updating Ubuntu to 18.04. This answer solved it for me. Note: I also had to uninstall matplotlib before via pip: `pip uninstall matplotlib` – ala May 03 '18 at 11:40
1

There should not be any reason for downgrading matplotlib. If someone thinks there is an issue with matplotlib, better inform the developpers about it. However, seen from the other answers here this problem should be solvable by getting the environment into which matplotlib is installed correctly set up. – ImportanceOfBeingErnest May 03 '18 at 18:44
1

This works like a charm. It also solves the mysterious import error of 'cbook' ( https://stackoverflow.com/questions/44623376/importerror-cannot-import-name-cbook ). – Shaohua Li Aug 20 '18 at 13:31
This worked! thanks a lot! I am trying to figure out the problem for more than an hour. Reinstalling my python, messing with the files on the lib/site-packages folder. – newbie programmerz Nov 14 '18 at 20:20
https://github.com/matplotlib/matplotlib/issues/9578#issuecomment-339479995 – Jirka Jan 02 '19 at 21:56

score 30 · Answer 2 · answered Nov 10 '17 at 03:09

30

I had the same problem but I fixed it.

Uninstall first

pip uninstall backports.functools_lru_cache

and then re-install it.

pip install backports.functools_lru_cache

Now I'm able to import matplotlib. Hope this helps.

answered Nov 10 '17 at 03:09

Shree Ranga Raju

591
5
11

3

I'm experiencing the same issue. The uninstall/installation of backports.functools_lru_cache did not help. I am using Ubuntu 16.04, Python 27, pip 9.0.1, too) – enobufs Nov 15 '17 at 20:26
I'm using Ubuntu 14.04, Python 2.7.14 and pip 9.0.1. It worked for me. – Shree Ranga Raju Nov 16 '17 at 06:09
@enobufs were you able to solve the issue, I am facing the same. – saha rudra Jan 11 '18 at 22:36
@saharudra Yes, for my situation. See my post below. – enobufs Jan 12 '18 at 05:35
@enobufs I did try that but of no use. I uninstalled matplotlib, even uninstalled python2.7 and started from scratch but of no use. – saha rudra Jan 12 '18 at 19:39
Did you try installing using anaconda? – Shree Ranga Raju Jan 13 '18 at 22:48
for Python2.7 it does not help, try `from backports.functools_lru_cache import lru_cache` – Jirka Jan 02 '19 at 21:59

score 20 · Answer 3 · answered Aug 24 '18 at 14:30

20

Install arrow using:

pip install arrow==0.12.0

fixed this issue for me

answered Aug 24 '18 at 14:30

Aditya Jain

201
2
2

Interesting... this just worked for me. It resulted in uninstalling `backports.functools-lru-cache-1.5` and then installing `backports.functools-lru-cache-1.2.1`. What's not obvious to me is why this fixes anything.. in an interactive session the import worked fine with version 1.5. – zgana Nov 20 '18 at 17:39
Woo, magic! that works for me, with Python 2.7.16 and resulted in downgrade to *backports.functools_lru_cache==1.2.1* – Y00 Nov 03 '19 at 22:25

score 14 · Answer 4 · answered Nov 15 '17 at 21:38

14

The pip command was actually the pip3, and the "ImportError" was happening when I used python (2.7).

pip2 uninstall backports.functools_lru_cache

then,

pip2 install backports.functools_lru_cache

fixed my problem.

answered Nov 15 '17 at 21:38

enobufs

860
1
7
12

This worked for me, perhaps pip being pip3 is a new thing – ijuneja Oct 24 '19 at 19:14

score 9 · Answer 5 · answered Jun 30 '18 at 18:02

You have to check what is the import path of backports package:

import backports
print('Backports Path: {0}'.format(backports.__path__))

1. The import path is the main python path ( the case of Matimath's question)

pip uninstall backports.functools_lru_cache   (this will uninstall it from /usr/local/)
pip install backports.functools_lru_cache

2. The import path is the local usr dir (~/.local/, or %APPDATA%\Python for windows)

pip uninstall backports.functools_lru_cache 
pip install --user backports.functools_lru_cache

Use pip2 command for python2.

The reason for this inconsistency is that the import path of backports package might have been changed during another module/package installation (eg. from backports.configparser module) - see here for more details: https://bugs.python.org/issue31741

The ''--user'' is exactly what is needed in a virtualenv – xiawi Oct 23 '18 at 16:54 — xiawi, Oct 23 '18 at 16:54

score 7 · Answer 6 · answered Dec 02 '19 at 03:38

7

Following from Aditya Jain's answer,

[python -m] pip uninstall backports.functools_lru_cache
[python -m] pip install backports.functools_lru_cache==1.2.1

which will avoid installing arrow merely to downgrade functools_lru_cache.

answered Dec 02 '19 at 03:38

JDQ

443
7
11

score 3 · Answer 7 · answered Dec 05 '17 at 14:48

3

I had the same problem and my solution was;

Download whl file from https://pypi.python.org/pypi/backports.functools_lru_cache/1.3
pip install

answered Dec 05 '17 at 14:48

HilmiK

53
10

score 2 · Answer 8 · answered Jan 10 '18 at 12:20

I solved my problem by removing the excessive matplotlib packages. I found out that when importing matplotlib it was attempting to import backports.functools_lru_cache and there it was throwing the Importerror.

I realized that I had different matplotlib packages in many locations:

/usr/lib/python2.7/dist-packages/matplotlib/
/usr/lib/python2.7/site-packages/matplotlib/

I removed the site-packages one. I left the dist-packages one intact.

Then I ran the following commands in python:

matplotlib.get_configdir()
matplotlib.get_cachedir()

and I removed the matplotlib packages in the output paths of these commands.

Then I removed the matplotlib in my virtualenvironment:

mv /home/username/virtualenvironment/lib/python2.7/matplotlib* /tmp

Finally I removed the one in the .local folder:

mv /home/username/.local/lib/python2.7/matplotlib* /tmp

Now importing matplotlib works fine. So when I run in python:

matplotlib.__file__

it returns

'/usr/lib/python2.7/dist-packages/matplotlib/__init__.pyc'

Now it does not throw error anymore when import backports.functools_lru_cache

score 2 · Answer 9 · answered Feb 02 '19 at 09:23

2

You are using pyhton 2. try to use pip2 instead:

pip2 uninstall matplotlib
sudo apt-get autoremove python-matplotlib
sudo apt-get install python-matplotlib

answered Feb 02 '19 at 09:23

darrey

51
1
6

score 2 · Answer 10 · answered May 23 '20 at 19:32

If you're experiencing this issue on Ubuntu 18.x (and maybe other versions): it is caused by this Ubuntu bug. The problem is in the Ubuntu package python-configparser which is installed as a dependence of python-pip. It contains empty __init__ file

/usr/lib/python2.7/dist-packages/backports/__init__.py

Hence, pip modules installed to /usr/local/lib/python2.7/dist-packages/backports are simply ignored. As soon as this bug is not fixed yet, the easiest way to fix this is to remove this package:

sudo apt remove python-configparser

It does not any harm to any of your backports modules installed by pip (since they are in another folder), and this is much safer than version downgrade.

See also this pip issue with similar problem around backports module.

It solved me the problem on Raspberry Pi too, while I was trying to play with BeautifulSoup4 using CSS selectors. — amiltonjr, Apr 14 '21 at 22:24

score 1 · Answer 11 · answered Jul 12 '18 at 09:33

1

I had same issue, re-installation of backports.functools_lru_cache resolved the issue

answered Jul 12 '18 at 09:33

Ragesh Moorkoth

11
1

1

Please try adding an explanation. – Ullas Hunka Jul 12 '18 at 09:54

score 1 · Answer 12 · edited Oct 21 '18 at 16:47

1

Also meet this issue on Ubuntu 16. Uninstall & reinstall not work for me.

My solution is reinstall from apt.

pip uninstall matplotlib
sudo apt-get autoremove python-matplotlib
sudo apt-get install python-matplotlib

edited Oct 21 '18 at 16:47

Hossein Golshani

1,847
5
16
27

answered Oct 21 '18 at 16:26

FAN

189
1
7

score 1 · Answer 13 · answered Mar 13 '20 at 06:09

1

This worked for me. Ubuntu 18.04.

sudo pip2 uninstall backports.functools-lru-cache
sudo apt install python-backports.functools-lru-cache

answered Mar 13 '20 at 06:09

Akshay Suresh

373
1
3
9

score 0 · Answer 14 · answered Jun 24 '18 at 06:18

0

this worked for me

from backports.functools_lru_cache import lru_cache

answered Jun 24 '18 at 06:18

Aze

119
1
3

This is giving following error on Ubuntu 18: '''ImportError: No module named functools_lru_cache''' – sai Feb 23 '21 at 06:53

python 2.7 functools_lru_cache does not import although installed

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