How to use 'plt legend title' in Python

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251def legend(self, ax, lines=(), labels=(), legend_loc="best"):
252 ax.legend(
253 lines,
254 labels,
255 title=None,
256 loc=legend_loc,
257 frameon=False,
258 ncol=1,
259 labelspacing=0.5,
260 columnspacing=1,
261 borderpad=1,
262 handlelength=2,
263 fontsize=12,
264 )
265 return ax
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325def legend(*args, **kwargs):
326 kwargs.setdefault('framealpha', 0.2)
327 try:
328 plt.legend(*args, **kwargs)
329 except:
330 warnings.warn("framealpha not effective")
331 kwargs.pop('framealpha')
332 plt.legend(*args, **kwargs)

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