Use a dictionary to count the number of hits by hostname from a proxy log file, where the 7th tab delimited entry per line is the host. KeyError is the exception thrown if a dictionary doesn’t yet contain the key being referred to.<\/p>\n
def parselog(infile):\n i = 0\n fbook = 0\n totals = {}\n\n for line in infile.xreadlines():\n desthost = line.split(\"\\t\")[6]\n \n try:\n totals[desthost] += 1\n except KeyError:\n totals[desthost] = 1\n\n if desthost.find(\"facebook\") > 0:\n fbook +=1\n\n i += 1\n \n return i, fbook, totals<\/pre>\n","protected":false},"excerpt":{"rendered":"Use a dictionary to count the number of hits by hostname from a proxy log file, where the 7th tab delimited entry per line is the host. KeyError is the exception thrown if a dictionary…<\/p>\n