Explicitly set sigma value to 0 to avoid warning

TODO.txt

@@ -4,6 +4,7 @@ Version 0.10
 * Remove deprecated parameter `epsilon` of `skimage.viewer.LineProfile`
 * Remove backwards-compatability of `skimage.measure.regionprops`
 * Remove {`ratio`, `sigma`} deprecation warnings of `skimage.segmentation.slic`
+  and also remove explicit `sigma` parameter from doc-string example
 * Change default mode of random_walker segmentation to 'cg_mg' > 'cg' > 'bf',
   depending on which optional dependencies are available.
 * Remove deprecated `out` parameter of `skimage.morphology.binary_*`
@@ -13,3 +14,4 @@ Version 0.10
 * Remove deprecated `skimage.color.is_gray` and `skimage.color.is_rgb`
   functions
 
+

skimage/segmentation/slic_superpixels.py

@@ -87,9 +87,12 @@ def slic(image, n_segments=100, compactness=10., max_iter=10, sigma=None,
     >>> from skimage.segmentation import slic
     >>> from skimage.data import lena
     >>> img = lena()
-    >>> segments = slic(img, n_segments=100, compactness=10)
-    >>> # Increasing the compactness parameter yields more square regions
-    >>> segments = slic(img, n_segments=100, compactness=20)
+    >>> segments = slic(img, n_segments=100, compactness=10, sigma=0)
+
+    Increasing the compactness parameter yields more square regions:
+
+    >>> segments = slic(img, n_segments=100, compactness=20, sigma=0)
+
     """
 
     if sigma is None: