On my Arch I have pylint 1.6.4, which generates many warnings:

{code}
$ pylint sio/compilers/test/test_compilers.py
************* Module test_compilers
sio/compilers/test/test_compilers.py 300 W0511 TODO: Do not run slow tests by default
sio/compilers/test/test_compilers.py 283 C0326 No space allowed after bracket
    nasty_loopers = [ '/nasty-%s' % (s,) for s in nasty_loopers]
                    ^
sio/compilers/test/test_compilers.py 324 W0311 Bad indentation. Found 12 spaces, expected 8
sio/compilers/test/test_compilers.py 11 W0611 Unused DEFAULT_COMPILER_TIME_LIMIT imported from sio.compilers.common
sio/compilers/test/test_compilers.py 11 W0611 Unused DEFAULT_COMPILER_MEM_LIMIT imported from sio.compilers.common
sio/compilers/test/test_compilers.py 11 C0412 Imports from package sio are not grouped
{code}

These are probably new warnings, which have been added since 1.3.1