In [1]: help(plt.hist)

Help on function hist in module matplotlib.pyplot:

hist(x, bins=10, range=None, normed=False, weights=None, cumulative=False, bottom=None, histtype='bar', align='mid', orientation='vertical', rwidth=None, log=False, color=None, label=None, stacked=False, hold=None, data=None, **kwargs)

    Plot a histogram.

# Create histogram of life_exp data

plt.hist(life_exp);

# Display histogram

plt.show()

# Build histogram with 5 bins

plt.hist(life_exp, bins = 5)

# Show and clean up plot

plt.show()

plt.clf()

# Build histogram with 20 bins

plt.hist(life_exp, bins = 20)

# Show and clean up again

plt.show()

plt.clf()

# Histogram of life_exp, 15 bins

plt.hist(life_exp, bins = 15)

# Show and clear plot

plt.show()

plt.clf()

# Histogram of life_exp1950, 15 bins

plt.hist(life_exp1950, bins = 15)

# Show and clear plot again

plt.show()

plt.clf()