The error when run flair

Flair
1

Versions

Please provide the used software versions.

FLUKA:4-5.1
Flair:3-3.1
Operating system:ubuntu20.04

Description

Please describe the issue. In case of reporting a bug, please provide step-by-step instructions for reproducing the error.

Input files

Please upload all relevant files. (FLUKA input file, Flair project file, user routines, and data files)

rtqc@ubuntu:~$ flair
Traceback (most recent call last):
File “/usr/local/flair/flair.py”, line 88, in
import inputs
File “/usr/local/flair/inputs.py”, line 18, in
import fluka
File “/usr/local/flair/fluka/init.py”, line 31, in
from .input import Fluka, LowNeutMaterial
File “/usr/local/flair/fluka/input.py”, line 245, in
class Fluka(Input):
File “/usr/local/flair/fluka/input.py”, line 260, in Fluka
abundances : dict[int,list[tuple[int,float]]] = {}
TypeError: ‘type’ object is not subscriptable

After update the flair, when running flair, the error message reported. Could you please advise how to solce it? thank you in advanced.

2

Dear Jilong,

Please confirm that you are getting the error with the latest Flair version, 3.4-5.2.

Cheers,
David

3

rtqc@ubuntu:~/Downloads$ sudo dpkg -i flair_3.4-5.2_ubuntu20.04_all.deb
(Reading database … 192056 files and directories currently installed.)
Preparing to unpack flair_3.4-5.2_ubuntu20.04_all.deb …
Unpacking flair (3.4-5.2) over (3.4-5.2) …
Setting up flair (3.4-5.2) …
Processing triggers for shared-mime-info (1.15-1) …
Processing triggers for hicolor-icon-theme (0.17-2) …
Processing triggers for gnome-menus (3.36.0-1ubuntu1) …
Processing triggers for desktop-file-utils (0.24-1ubuntu3) …
Processing triggers for mime-support (3.64ubuntu1) …
rtqc@ubuntu:~/Downloads$ flair
Traceback (most recent call last):
File “/usr/local/flair/flair.py”, line 88, in
import inputs
File “/usr/local/flair/inputs.py”, line 18, in
import fluka
File “/usr/local/flair/fluka/init.py”, line 31, in
from .input import Fluka, LowNeutMaterial
File “/usr/local/flair/fluka/input.py”, line 245, in
class Fluka(Input):
File “/usr/local/flair/fluka/input.py”, line 260, in Fluka
abundances : dict[int,list[tuple[int,float]]] = {}
TypeError: ‘type’ object is not subscriptable

Thank you. I deleted the previous flair (/usr/local/ and re-download and installed it, but the problem still persists.

4

Dear Jilong,

Please check what your Python version is.

Flair (or at least the line causing the error) requires version 3.9 to work correctly.

Cheers,
David

5

Thank you, David.

It’s a problem with the Python version. Currently, on the Ubuntu system, the version is Python 3.8. Thank you.

6

Dear Jilong,

You may try to install Python 3.9, but I’m not sure all packages needed for Flair are available for this version of Python on Ubuntu 20.04.

Instead, I would recommend upgrading your Ubuntu version to at least 22.04, since the normal support for Ubuntu 20.04 ended in May last year.

Cheers,
David

7

Thank you for your reminder. I will also consider upgrading the system. Thank you.