commands of catkin tools giving errors

edit

Recently I installed catkin tools. I have ros (melodic) installed on my system (Ubuntu 18.04). The problem is that I can use catkin_init_workspace, but not catkin init. Using catkin_init or any of the commands of catkin tools gives me an error that asyncio is missing. So I installed asyncio using pip, but now I am getting this error:

Traceback (most recent call last):
File "/home/comp/.local/bin/catkin", line 11, in <module>
load_entry_point('catkin-tools==0.4.5', 'console_scripts', 'catkin')()
File "/home/comp/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 489, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/home/comp/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2852, in load_entry_point
return ep.load()
File "/home/comp/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2443, in load
return self.resolve()
File "/home/comp/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2449, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/home/comp/.local/lib/python2.7/site-packages/catkin_tools/commands/catkin.py", line 28, in <module>
from catkin_tools.common import is_tty
File "/home/comp/.local/lib/python2.7/site-packages/catkin_tools/common.py", line 24, in <module>
import asyncio
File "/home/comp/.local/lib/python2.7/site-packages/asyncio/__init__.py", line 9, in <module>
from . import selectors
File "/home/comp/.local/lib/python2.7/site-packages/asyncio/selectors.py", line 39
"{!r}".format(fileobj)) from None
                           ^
SyntaxError: invalid syntax

Any help is appreciated!

EDIT :

I just made a directory with a src directory in it and ran :

catkin init

I get the above error. However catkin_init_workspace worked fine. If needed, these are the instructions I followed to install catkin tools -

https://catkin-tools.readthedocs.io/en/latest/installing.html

This is how I installed catkin tools -

$ sudo sh -c 'echo "deb http://packages.ros.org/ros/ubuntu lsb_release -sc main" > /etc/apt/sources.list.d/ros-latest.list'

$ wget http://packages.ros.org/ros.key -O - | sudo apt-key add -

$ sudo apt-get update

$ sudo apt-get install python-catkin-tools

This is the command I used to install asyncio:

pip install asyncio

EDIT 2:

I tried to install catkin tools from source (from the same website as earlier). I am still getting syntax errors, but different ones...

Commands I used:

$ git clone https://github.com/catkin/catkin_tool...

$ cd catkin_tools

$ pip install -r requirements.txt --upgrade

$ sudo python setup.py install --record install_manifest.txt

The first three commands work fine, the fourth one (sudo python setup.py install ...) gives these errors:

sudo python setup.py install --record install_manifest.txt
running install
running build
running build_py
running install_lib
byte-compiling /usr/local/lib/python2.7/dist-packages/catkin_tools/execution/executor.py to executor.pyc
File "/usr/local/lib/python2.7/dist-packages/catkin_tools/execution/executor.py", line 73
yield from lock
         ^
SyntaxError: invalid syntax

running install_data
running install_egg_info
running egg_info
writing requirements to catkin_tools.egg-info/requires.txt
writing catkin_tools.egg-info/PKG-INFO
writing top-level names to catkin_tools.egg-info/top_level.txt
writing dependency_links to catkin_tools.egg-info/dependency_links.txt
writing entry points to catkin_tools ...