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[py] improve style for demo_source_simple.py

--- a/python/demos/demo_source_simple.py

+++ b/python/demos/demo_source_simple.py

@@ -1,16 +1,20 @@

 #! /usr/bin/env python

+

+"""A simple example using aubio.source."""

+

 import sys

 import aubio

-samplerate = 0 # use original source samplerate

-hop_size = 256 # number of frames to read in one block

+samplerate = 0  # use original source samplerate

+hop_size = 256  # number of frames to read in one block

 src = aubio.source(sys.argv[1], samplerate, hop_size)

 total_frames = 0

 while True:

-    samples, read = src()     # read hop_size new samples from source

-    total_frames += read      # increment total number of frames

-    if read < hop_size: break # end of file reached

+    samples, read = src()  # read hop_size new samples from source

+    total_frames += read   # increment total number of frames

+    if read < hop_size:    # end of file reached

+        break

 fmt_string = "read {:d} frames at {:d}Hz from {:s}"

-print (fmt_string.format(total_frames, src.samplerate, src.uri))

+print(fmt_string.format(total_frames, src.samplerate, src.uri))