python字典转化为数组,如何将Python字典对象转换为numpy数组

I have python dict object with key as datetime.date object and values as tuple objects:

>>> data_dict

{datetime.date(2006, 1, 1): (5, 3),

datetime.date(2006, 1, 2): (8, 8),

datetime.date(2006, 1, 3): (8, 5),

datetime.date(2006, 1, 4): (3, 3),

datetime.date(2006, 1, 5): (3, 3),

datetime.date(2006, 1, 6): (4, 3),

...

and I want to convert it to numpy array object in this format:

dtype([('date', '|O4'), ('high', '

so that I could store it on disk and later work with it, and learn, in numpy, matplotlib...

As a matter of fact, I thought to use this format after looking at this matplotlib examples: http://matplotlib.sourceforge.net/users/recipes.html but can't find my way out how to get there.

解决方案

The following will do it:

arr = np.array([(k,)+v for k,v in data_dict.iteritems()], \

dtype=[('date', '|O4'), ('high', '

If you then wish to use arr as a recarray, you could use:

arr = arr.view(np.recarray)

This will enable you to reference fields by name, e.g. arr.date.