Typically, pep8 suggests you prefer parentheses over continuation lines .
The preferred way to wrap long strings is to use line continuation under Python in parentheses, brackets, and curly braces. Long lines can be split into multiple lines, wrapping expressions in parentheses. They should be used instead of using a backslash to continue the line.
I.e:
if len(argmaxcomp) == 1:
print("The complex with the greatest mean abundance is: {0}"
.format(argmaxcomp[0]))
Another option is to use python 3 print:
from __future__ import print_function
if len(argmaxcomp) == 1:
print("The complex with the greatest mean abundance is:", argmaxcomp[0])
. print_function / ... , .