PEP8 fixes

lambdas and imports

tests/test_transfer.py

@@ -3,7 +3,6 @@ from amodem import common
 from amodem import dsp
 from amodem import sampling
 from amodem import config
-config = config.fastest()
 
 import numpy as np
 import os
@@ -15,6 +14,8 @@ logging.basicConfig(level=logging.DEBUG,
 
 import pytest
 
+config = config.fastest()
+
 
 class Args(object):
     def __init__(self, **kwargs):