total_minutes_by_account 是一个按帐户显示值的字典.
total_min 显示以逗号分隔的值,但会得到以下错误.
total_min=total_minutes_by_account.values()
import numpy as np
np.mean(total_min)
File "<ipython-input-17-7834a3d1e5e6>", line 1, in <module>
np.mean(total_min)
File "/Users/newtopython/anaconda/lib/python3.5/site-packages/numpy/core/fromnumeric.py", line 2942, in mean
out=out, **kwargs)
File "/Users/newtopython/anaconda/lib/python3.5/site-packages/numpy/core/_methods.py", line 72, in _mean
ret = ret / rcount
TypeError: unsupported operand type(s) for /: 'dict_values' and 'int'