def venn2_circles(subsets, normalize_to=1.0, alpha=1.0, color='black', linestyle='solid', linewidth=2.0, ax=None, **kwargs):
'''
Plots only the two circles for the corresponding Venn diagram.
Useful for debugging or enhancing the basic venn diagram.
parameters ``subsets``, ``normalize_to`` and ``ax`` are the same as in venn2()
``kwargs`` are passed as-is to matplotlib.patches.Circle.
returns a list of three Circle patches.
>>> c = venn2_circles((1, 2, 3))
>>> c = venn2_circles({'10': 1, '01': 2, '11': 3}) # Same effect
>>> c = venn2_circles([set([1,2,3,4]), set([2,3,4,5,6])]) # Also same effect
'''
if isinstance(subsets, dict):
subsets = [subsets.get(t, 0) for t in ['10', '01', '11']]
elif len(subsets) == 2:
subsets = compute_venn2_subsets(*subsets)
areas = compute_venn2_areas(subsets, normalize_to)
centers, radii = solve_venn2_circles(areas)
if ax is None:
ax = gca()
prepare_venn_axes(ax, centers, radii)
result = []
for (c, r) in zip(centers, radii):
circle = Circle(c, r, alpha=alpha, edgecolor=color, facecolor='none', linestyle=linestyle, linewidth=linewidth, **kwargs)
ax.add_patch(circle)
result.append(circle)
return result
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