I think you want the last line to be

ssh.exec_command('cp test.txt {}.mrs_stats0.{}.pytest.gz ; chmod +r {}.mrs_stats0.{}s.gz'.format(host, ydate, host, ydate))

just a misplaced bracket. In your current code ssh is paramiko.SSHClient() instance and its method exec_command() method returns the stdin, stdout, and stderr of the executing command, as a 3-tuple (link to docs]

You return four variables s1,s2,s3,s4 and receive them using a single variable obj. This is what is called a tuple, obj is associated with 4 values, the values of s1,s2,s3,s4. So, use index as you use in a list to get the value you want, in order.

Copyobj=list_benefits()
print obj[0] + " is a benefit of functions!"
print obj[1] + " is a benefit of functions!"
print obj[2] + " is a benefit of functions!"
print obj[3] + " is a benefit of functions!"

First of all, you call reduire as if it is a class/static method, but it is an instance method, so it is more natural to call it as frac.reduire()

The error comes from your call of __str__ (which again you call as if it is a class/static method) and you pass it the value that reduire returns (a tuple) instead of the frac instance. The __str__ function expects the fraq instance (self) as argument. This can be done better with str(fraq), in a separate statement.

But as your goal is to print, this call of str (and __str__) can actually be omitted. print already takes care of this. So just do:

frac.reduire()
print(frac)  # this implicitly calls `__str__`

Cell coordinates should be provided as a string:

ws['A1'] = 'testing 1-2-3'

Or, if you want to use row and column indexes, use ws.cell().value:

ws.cell(row=1, column=1).value = 'testing 1-2-3'