python - How to comment out one line of a multiline statement -

as shown in following code, groupby line should commented out:

lines = fileinput.input(fin) \         | take(300) \         | where(lambda x: not x.strip().endswith(',,,,,')) \         \ # | groupby(lambda x: x[42])          | teefile(fout,100) 

however above syntax - , several variations on - not work:

 \ # | groupby(lambda x: x[42])                                                                                                                                                                  ^ syntaxerror: unexpected character after line continuation character 

another variation attempted:

    # | groupby(lambda x: x[42]) \  

is there way comment out portion of longer statement requiring continuation characters? or out of luck - along lines of python's inability (/unwillingness) support inline comments?

i on 2.7

update here small update code snippet make self contained.

import sys, pipe, fileinput ; pipe import *; lines = fileinput.input(fin) \         | take(300) \         | where(lambda x: not x.strip().endswith(',,,,,,,,')) \         # | groupby(lambda x: x[42]) \         | tee 

it including import now. different errors in ipython vs intellij:

ipython :

file "<ipython-input-2-60c5dbee382d>", line 3     | tee     ^ indentationerror: unexpected indent 

intellij :

 file "<ipython-input-30-1f7b64578a1f>", line 16     lines = fileinput.input(fin)         | take(300)         | where(lambda x: not x.strip().endswith(',,,,,,,,,,,,,,,,,,,,,'))   \ # | groupby(lambda x: x[42])                                                                                                                                                                  ^ syntaxerror: unexpected character after line continuation character 

use implicit line continuation parentheses:

lines = (fileinput.input(fin)         | take(300)         | where(lambda x: not x.strip().endswith(',,,,,')) #       | groupby(lambda x: x[42])          | teefile(fout,100)) 

inside unclosed parentheses (, brackets [, or braces {, python perform line continuation automatically, across lines comments. rules line joining backslashes don't allow line continuation on line comment.