cruyff8's barplot

import datetime
import pandas as pd
#import math
import numpy as np
import matplotlib.pyplot as plt

# download and process data
relevant = pd.io.parsers.read_csv('http://hasan.d8u.us/links.py.cgi?format=csv')

data = np.zeros_like(relevant)
for i, t in enumerate(relevant['Timestamp']):
    data[i] = int(datetime.datetime.fromtimestamp(t).strftime('%H'))

# histogram
bins = np.arange(0, 25)    # hours of the day
hist = np.histogram(data, bins)[0]

# plot
fig = plt.figure(figsize=(6, 4.5), dpi=120)
ax = fig.add_subplot(111)

bar_width = 0.8
hours = bins[:-1] - bar_width * 0.5 # discard last bin boundary and move bars

ax.bar(hours, hist, bar_width, color='#2040ff', lw=0.8)
ax.set_xlabel('Hour of day')
ax.set_xlim(-1, 24)
ax.set_xticks(range(0, 24, 3))
ax.set_title('What hour were links sent out?', y=1.03)

plt.savefig('barplot.png', dpi=400)
plt.show()