Matplotlib plot is a no-show

When I run this code

import pandas as pd
import numpy as np
def add_prop(group):
    births = group.births.astype(float)
    group['prop'] = births/births.sum()
    return group

pieces = []
columns = ['name', 'sex', 'births']

for year in range(1880, 2012):
    path = 'yob%d.txt' % year
    frame = pd.read_csv(path, names = columns)
    frame['year'] = year
    pieces.append(frame)
    names = pd.concat(pieces, ignore_index = True)

total_births = names.pivot_table('births', rows = 'year', cols = 'sex', aggfunc = sum)
total_births.plot(title = 'Total Births by sex and year')

I get no plot. This is from Wes McKinney's book on using Python for data analysis. Can anyone point me in the right direction?

Put

import matplotlib.pyplot as plt

at the top, and

plt.show()

at the end.

In the IPython notebook you could also use %matplotlib inline at the top of the notebook to automatically display the created plots in the output cells.

your code is correct. just put:

import matplotlib as plt

for diplaying you plot:

plt.show()