画图表工具Matplotlib

$ sudo pip3.4 install matplotlib

$ pip3.4 freeze | grep mat
matplotlib==1.4.2

import pylab
pylab.plot([1, 2, 3, 4])
pylab.show()

import pylab
pylab.plot([1, 2, 3, 4])
pylab.savefig('line.png')

import pylab
L = range(-100, 101)
pylab.plot(L, [x**2 - 300 for x in L])
pylab.show()

import pylab

fig = pylab.figure()
X = range(-100, 101)
Y = [i**2 - 300 for i in X]

ax = fig.add_subplot(1, 1, 1)

ax.plot(X, Y)
ax.plot(X, X)

ax.spines['left'].set_position('center')
ax.spines['bottom'].set_position('center')
ax.spines['right'].set_color('none')
ax.spines['top'].set_color('none')
ax.xaxis.set_ticks_position('bottom')
ax.yaxis.set_ticks_position('left')
pylab.axis([-100, 100, -1000, 1000])
pylab.show()

import datetime
import pylab
from matplotlib.dates import DayLocator, DateFormatter, drange

d1 = datetime.date(2014, 10, 1)
d2 = datetime.date(2014, 11, 1)
delta = datetime.timedelta(days=1)

dates = drange(d1, d2, delta)
Y = [110.92, 71.55, 38.54, 58.79, 29.11, 69.95, 96.76, 111.07, 151.88, 121.92, 143.47, 149.78, 98.65, 93.64, 88.23, 62.77, 64.05, 73.40, 72.12, 12.29, 17.36, 27.26, 29.62, 24.08, 22.95, 30.86, 21.21, 76.04, 82.15, 104.78, 55.37]

fig, ax = pylab.subplots()
ax.plot(dates, Y)
ax.set_xlim( dates[0], dates[-1] )

ax.xaxis.set_major_locator(DayLocator())
ax.xaxis.set_major_formatter(DateFormatter('%Y-%m-%d'))
fig.autofmt_xdate()

pylab.ylabel('Players Total Online Time (hours)')
pylab.show()