use list comprehensions instead of map()

amodem/calib.py

@@ -13,7 +13,7 @@ def send(config, dst, src=None, verbose=False):
     calibration_symbols = int(1.0 * config.Fs)
     t = np.arange(0, calibration_symbols) * config.Ts
     signals = [np.sin(2 * np.pi * f * t) for f in config.frequencies]
-    signals = map(common.dumps, signals)
+    signals = [common.dumps(s) for s in signals]
 
     try:
         for signal in itertools.cycle(signals):

amodem/sampling.py

@@ -18,7 +18,7 @@ class Interpolator(object):
             filt = h[index::resolution]
             filt = filt[::-1]
             self.filt.append(filt)
-        lengths = map(len, self.filt)
+        lengths = [len(f) for f in self.filt]
         self.coeff_len = 2*width
         assert set(lengths) == set([self.coeff_len])
         assert len(self.filt) == resolution