use two items as key to create dictionary python
python
Solution
You can use any (hashable) object as a key for a python dictionary, so just use a tuple containing those two values as the key.
Problem
Possible Duplicate: How do I make a dictionary with multiple keys to one value? I have 5 columns of data, ``` usermac, useragent, area ,videoid, number of requests ``` I want to use both (usermac,useragent) as key to create a dictionary, since unique combination of (usermac, useragent) represents a unique user. so the dictionary would be like: ``` usermac1, useragent1: area1, videoid1, 10 area1, videoid2, 29 usermac1, useragent2: area1, videoid1, 90 area1, videoid2, 34 ... ``` I only know how to create a dictionary with only one item as key. so can anyone help? my code is: ``` for line in fd_in.readlines(): (mac, useragent, area, videoid, reqs) = line.split() video_dict = d1.setdefault((mac,useragent) {}) video_dict.setdefault(videoid, []).append(float(reqs)) ``` and it has syntax error: ``` video_dict = d1.setdefault((mac,useragent) {}) ```