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.

From: stackoverflow.com/q/16522380

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