忽略每行的最后一个元素：
with open(waveform, 'rb') as f:
reader = csv.reader(f)
for row in reader:
print row[:-1]
或将每一行转换成字典：
columns = ['value']
with open(waveform, 'rb') as f:
reader = csv.reader(f)
for row in reader:
rec = dict(zip(columns, row))
print rec
版画
{'value': '-1'}
{'value': '-1'}
{'value': '1'}
{'value': '1'}
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