import numpy as np
import pandas as pd
import matplotlib.pyplot as plt
np.random.seed(2015)
y = np.random.randint(5, 50, (10, 3))
x = np.arange(10)
df = pd.DataFrame(y, index=x)
df = df.divide(df.sum(axis=1), axis=0)
ax = df.plot(kind='area', stacked=True, title='100 % stacked area chart')
ax.set_ylabel('Percent (%)')
ax.margins(0, 0)
plt.show()
100% area plot of a pandas DataFrame