json loads throwing error

[snippsat]

the output returned from ssh1.send_command("show env power | json") is class str

As mention you most make a variable and post what the result is.
It most return a valid json string for json.load() to work.

arista_commands = ["show env power | json"]
for command in arista_commands:
    raw_output = ssh1.send_command(command)
    print(raw_output) # Most return a valid json string 

To give a example on how a valid json string looks.

>>> import json
>>> raw_output = '{"name":"John", "age":30, "city":"New York"}'
>>> data = json.loads(raw_output)
>>> data
{'age': 30, 'city': 'New York', 'name': 'John'}
>>> data['city']
'New York'