Question

I read data from a bunch or emails and count frequency of each word. first construct two counters:

counters.stats = collections.defaultdict(dict)

The key of stats is word. For each word, I construct a dict, whose key is the name of the email and value is the frequency of that word in this email.

Now I have a list which contains those keys in counters.stats, by in a different order. I want to sort the key in ‘stats’ by the list.

def print_stats(counters):
    for form, cat_to_stats in sorted(counters.stats.items(), key = chi_sort):

How to build the function chi_sort? Or other methods?

Answer 1

Assuming that the values in L only occur once:

D = dict((b,a) for a,b in enumerate(L))
chi_sort = D.get

where L refers to your list.

If this yields the values in reverse order, you can fix that by adding reversed=True to your sorted call.