You can just iterate over the list to unpack each piece.
mylist = [('"ram', '18"'), ('"kp', '12"'), ('"nm', '14"')]
for tup in mylist:
print ",".join(tup)
Output:
"ram,18"
"kp,12"
"nm,14"
If you do not like the quotes, just remove them after the join.
for tup in mylist:
print ",".join(tup).replace('"','')
Output:
ram,18
kp,12
nm,14