Version of pip package diamond can't be called, neither by --version nor by other packages - pip

Question

I need the pip package 'diamond' as a prerequisite for another package (humann3), however something doesn't work.
When I try to start humann3 it returns
CRITICAL ERROR: Can not call software version for diamond
So I try to check my diamond version with "diamond --version" but it returns
user#server:~$ diamond --version File
"/home/user/.local/bin/diamond", line 113
print "Diamond version %s" % (get_diamond_version())
^
SyntaxError: invalid syntax
It's supposed to be version 4.0.515, I just uninstalled it and reinstalled it. No change.
The OS is Debian GNU/Linux 10 (buster), it's my college's computer, I can't change it. But I have permission to install and unistall packages.
Also I realized that if I use different python versions to run it directly, I get different errors.
Python 3 returns the same error:
(base) user#server:~$ python3 .local/bin/diamond
File ".local/bin/diamond", line 113
print "Diamond version %s" % (get_diamond_version())
^
SyntaxError: invalid syntax
Python 2 returns another one:
(base) user#server:~$ python2 .local/bin/diamond
Traceback (most recent call last):
File ".local/bin/diamond", line 24, in <module>
from diamond.server import Server
ImportError: No module named diamond.server

Answer 1

Python 3 returns the same error:
(base) user#server:~$ python3 .local/bin/diamond
File ".local/bin/diamond", line 113
print "Diamond version %s" % (get_diamond_version())
^
SyntaxError: invalid syntax
The code print "" is for Python 2 only, in Python 3 it is SyntaxError. The problem was fixed in the Github repository but the code was not released to PyPI. To us it under Python 3 you need to install it from Github. First install git if you haven't installed it yet and the run
pip install -U git+https://github.com/python-diamond/Diamond.git
Python 2 returns another one:
(base) user#server:~$ python2 .local/bin/diamond
Traceback (most recent call last):
File ".local/bin/diamond", line 24, in <module>
from diamond.server import Server
ImportError: No module named diamond.server
You've installed the module only for Python 3, you cannot run it under Python 2. To run it under Python 2 you need to install it with Python 2:
python2 -m pip install -U diamond
But then you will also need to install everything (including humann3) under Python 2.