The following code plots two lines. The column names appear in the legend.
x=np.linspace(-10,10,201)
y,z=np.sin(x),np.cos(x)
x,y,z=pd.Series(x),pd.Series(y),pd.Series(z)
df=pd.concat([x,y,z],axis=1)
df.columns=['x','sin(x)','cos(x)']
df=df.set_index('x')
df.plot()
plt.show()
plt.clf();plt.close()
However, the following equivalent code shows None as legend, even though the labels are explicitly set.
ax=df.plot(y='sin(x)',label='sin(x)') df.plot(y='cos(x)',label='cos(x)',ax=ax) plt.show()
Of course there are alternative ways to make this work, but it appears to me that passing the labels should suffice. In particular, I don't think their values should be replaced with None, or printed as x-label.
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