running error

[Yan-echo]

features = random.sample(dataSet.columns.values[:-1], int(math.sqrt(m - 1)))
TypeError: Population must be a sequence or set. For dicts, use list(d).
What should I do? Thank you.

[zhaoxingfeng]

The code is written by python2.7, for python3 replace by
features = random.sample(df.columns.values[:-1].tolist(), int(math.sqrt(m - 1)))