Calculate the average rate at which the user has accrued friends and followers

accrual_rate.hpy

#!/bin/sh
"exec" "twxec" "-e" "average_accrual_rate" "$0" "$@"

from dateutil import parser

{{docstring "Calculate the average rate at which the user has accrued friends and followers"}}
_source = {{string Message_Type ["Twitter", "GNIP"]}}

def average_accrual_rate(msg):
    if _source == "GNIP":
        user = msg["actor"]
        followers = user["followersCount"]
        friends = user["friendsCount"]
        time_since_creation = parser.parse(user["postedTime"])
        latest_tweet_time = parser.parse(msg["postedTime"])
    else:
        user = msg["user"]
        followers = user["followers_count"]
        friends = user["friends_count"]
        time_since_creation = parser.parse(user["created_at"])
        latest_tweet_time = parser.parse(msg["created_at"])
    elapsed_days = ((latest_tweet_time - time_since_creation).days + 1.0)
    msg["followers_per_day"] = followers / elapsed_days
    msg["friends_per_day"] = friends / elapsed_days
    return msg