pass labels for legend in matplotlib plot code example

Example 1: change text in legend matplotlib

plt.plot(range(10), label='Some very long label')
plt.plot(range(1,11), label='Short label')
L=plt.legend()
L.get_texts()[0].set_text('make it short')
plt.savefig('temp.png')

Example 2: python no label in legend matplot

ax.plot(randn(1000).cumsum(), 'k.', label='_nolegend_')