Runtime error: zip_longest not found

[ceremcem]

modbus -v -s 1 -b 115200 -p 0 -P n /dev/ttyUSB1 I@40008
Traceback (most recent call last):
  File "/home/ceremcem/.local/bin/modbus", line 11, in <module>
    from modbus_cli.modbus_rtu import ModbusRtu
  File "/home/ceremcem/.local/lib/python2.7/site-packages/modbus_cli/modbus_rtu.py", line 3, in <module>
    from .access import dump
  File "/home/ceremcem/.local/lib/python2.7/site-packages/modbus_cli/access.py", line 2, in <module>
    from itertools import zip_longest, groupby
ImportError: cannot import name zip_longest

sudo pip install zip_longest
Collecting zip_longest
Could not install packages due to an EnvironmentError: 404 Client Error: Not Found for url: https://pypi.org/simple/zip-longest/

OS: Debian Buster

[favalex]

What version of python are you using? python2 is not supported. python3 should have zip_longest.

[ceremcem]

$ python3
Python 3.7.3 (default, Jul 25 2020, 13:03:44) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import zip_longest
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'zip_longest'

and I can't install zip_longest:

$ sudo python3 -m pip install zip_longest
[sudo] password for ceremcem: 
Collecting zip_longest
Could not install packages due to an EnvironmentError: 404 Client Error: Not Found for url: https://pypi.org/simple/zip-longest/

[favalex]

You have installed modbus_cli for python2.7, that won't work:

File "/home/ceremcem/.local/lib/python2.7/site-packages/modbus_cli/access.py"

python3 has zip_longest, but you are not testing it correctly:

$ python3
Python 3.6.9 (default, Jan 26 2021, 15:33:00) 
[GCC 8.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from itertools import zip_longest

[ceremcem]

Ah, yes. Please consider changing install instructions as:

python3 -m pip install modbus_cli