[Tutor] Dictionary File character reader

[Clara Mintz]

Sorry I am completely new at python and don't understand why this function is returning an empty dictionary. I want it to take a list of files open them then return the number of characters as the value and the file name as the key. 
def fileLengths(files):    d = {}    files = []    for file in files:        reader = open(file)        for line in reader:            char = sum(len(line))        d[file] = char        reader.close    return d
Thank you sorry I don't understand what I am doing wrong. 
-Clara 		 	   		  
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