possible solution for https://gist.github.com/christiandietrich/79051bbd582b96a93a2e

plotit.py

#!/usr/bin/python

from matplotlib import pyplot as plt
import matplotlib.dates as md
import datetime as dt
import csv

# Visualize CSV Data
with open('res.csv', 'rb') as f:

    reader = csv.reader(f, delimiter=',')
    subreddit = []
    readers = []
    active = []
    timestamp = []
    for row in reader:
        subreddit.append(row[0])
        readers.append(int(row[1]))
        active.append(int(row[2]))
        timestamp.append(dt.datetime.fromtimestamp(int(row[3])))
        # print subreddit, readers, active, timestamp # for debug

    plt.xticks(rotation=25)
    ax=plt.gca()
    xfmt = md.DateFormatter('%Y-%m-%d %H:%M:%S')
    plt.plot(timestamp, active)
    ax.xaxis.set_major_formatter(xfmt)
    plt.title("Active Users in Subreddit")

    # add a label to the y-axis
    plt.ylabel("Users")

    plt.show()