Convert streamplot to numpydoc (matplotlib#13078)

* Convert streamplot to numpydoc

* Small streamplot doc fixes

Author: dstansby

lib/matplotlib/streamplot.py

@@ -20,61 +20,64 @@ def streamplot(axes, x, y, u, v, density=1, linewidth=None, color=None,
                cmap=None, norm=None, arrowsize=1, arrowstyle='-|>',
                minlength=0.1, transform=None, zorder=None, start_points=None,
                maxlength=4.0, integration_direction='both'):
-    """Draw streamlines of a vector flow.
-
-    *x*, *y* : 1d arrays
-        an *evenly spaced* grid.
-    *u*, *v* : 2d arrays
-        x and y-velocities. Number of rows should match length of y, and
-        the number of columns should match x.
-    *density* : float or 2-tuple
-        Controls the closeness of streamlines. When `density = 1`, the domain
+    """
+    Draw streamlines of a vector flow.
+
+    Parameters
+    ----------
+    x, y : 1d arrays
+        An evenly spaced grid.
+    u, v : 2d arrays
+        *x* and *y*-velocities. Number of rows should match length of *y*, and
+        the number of columns should match *x*.
+    density : float or 2-tuple
+        Controls the closeness of streamlines. When ``density = 1``, the domain
         is divided into a 30x30 grid---*density* linearly scales this grid.
         Each cell in the grid can have, at most, one traversing streamline.
         For different densities in each direction, use [density_x, density_y].
-    *linewidth* : numeric or 2d array
-        vary linewidth when given a 2d array with the same shape as velocities.
-    *color* : matplotlib color code, or 2d array
+    linewidth : numeric or 2d array
+        Vary linewidth when given a 2d array with the same shape as velocities.
+    color : matplotlib color code, or 2d array
         Streamline color. When given an array with the same shape as
         velocities, *color* values are converted to colors using *cmap*.
-    *cmap* : :class:`~matplotlib.colors.Colormap`
+    cmap : `~matplotlib.colors.Colormap`
         Colormap used to plot streamlines and arrows. Only necessary when using
         an array input for *color*.
-    *norm* : :class:`~matplotlib.colors.Normalize`
-        Normalize object used to scale luminance data to 0, 1. If None, stretch
-        (min, max) to (0, 1). Only necessary when *color* is an array.
-    *arrowsize* : float
+    norm : `~matplotlib.colors.Normalize`
+        Normalize object used to scale luminance data to 0, 1. If ``None``,
+        stretch (min, max) to (0, 1). Only necessary when *color* is an array.
+    arrowsize : float
         Factor scale arrow size.
-    *arrowstyle* : str
+    arrowstyle : str
         Arrow style specification.
-        See :class:`~matplotlib.patches.FancyArrowPatch`.
-    *minlength* : float
+        See `~matplotlib.patches.FancyArrowPatch`.
+    minlength : float
         Minimum length of streamline in axes coordinates.
-    *start_points*: Nx2 array
+    start_points : Nx2 array
         Coordinates of starting points for the streamlines.
-        In data coordinates, the same as the ``x`` and ``y`` arrays.
-    *zorder* : int
-        any number
-    *maxlength* : float
+        In data coordinates, the same as the *x* and *y* arrays.
+    zorder : int
+        Any number.
+    maxlength : float
         Maximum length of streamline in axes coordinates.
-    *integration_direction* : ['forward', 'backward', 'both']
+    integration_direction : ['forward' | 'backward' | 'both']
         Integrate the streamline in forward, backward or both directions.
+        default is ``'both'``.
 
-    Returns:
-
-        *stream_container* : StreamplotSet
-            Container object with attributes
-
-                - lines: `matplotlib.collections.LineCollection` of streamlines
+    Returns
+    -------
+    stream_container : StreamplotSet
+        Container object with attributes
 
-                - arrows: collection of `matplotlib.patches.FancyArrowPatch`
-                  objects representing arrows half-way along stream
-                  lines.
+        - lines: `matplotlib.collections.LineCollection` of streamlines
 
-            This container will probably change in the future to allow changes
-            to the colormap, alpha, etc. for both lines and arrows, but these
-            changes should be backward compatible.
+        - arrows: collection of `matplotlib.patches.FancyArrowPatch`
+          objects representing arrows half-way along stream
+          lines.
 
+        This container will probably change in the future to allow changes
+        to the colormap, alpha, etc. for both lines and arrows, but these
+        changes should be backward compatible.
     """
     grid = Grid(x, y)
     mask = StreamMask(density)