尝试使用numpy列表获取一些统计值时出错

Question

您好我的代码有问题：

**import numpy as np
# Summarize the data about minutes spent in the classroom
#total_minutes = total_minutes_by_account.values()
total_minutes = list(total_minutes_by_account.values())
type(total_minutes)
# Printing out the samething converting to a list
print('Printing out the samething converting to a list ')
print(type(total_minutes))
print ('Mean:', np.mean(total_minutes))
print ('Standard deviation:', np.std(total_minutes))
print ('Minimum:', np.min(total_minutes))
print ('Maximum:', np.max(total_minutes))**

我得到的错误是：

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-93-945375bf6098> in <module>()
      3 # Summarize the data about minutes spent in the classroom
      4 #total_minutes = total_minutes_by_account.values()
----> 5 total_minutes = list(total_minutes_by_account.values())
      6 type(total_minutes)
      7 #print(total_minutes)
AttributeError: 'list' object has no attribute 'values'

我真的会撒谎知道我是如何做到这一点的，我可以用pandas将它转换为一个numpy数组并获得我想要的统计值numpy