prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Single int indexes param in sample method
  According to docs the `indexes` param in the `sample` method can be a "list of ints or a single int".
  
  However passing a single int raises this exception: `IndexError: too many indices for array`.
  
  
  </issue>
  <code>
  [start of rasterio/sample.py]
  1 # Workaround for issue #378. A pure Python generator.
  2 
  3 def sample_gen(dataset, xy, indexes=None):
  4     index = dataset.index
  5     read = dataset.read
  6     for x, y in xy:
  7         r, c = index(x, y)
  8         window = ((r, r+1), (c, c+1))
  9         data = read(indexes, window=window, masked=False, boundless=True)
  10         yield data[:,0,0]
  11
  [end of rasterio/sample.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/rasterio/sample.py b/rasterio/sample.py
  --- a/rasterio/sample.py
  +++ b/rasterio/sample.py
  @@ -3,6 +3,10 @@
   def sample_gen(dataset, xy, indexes=None):
       index = dataset.index
       read = dataset.read
  +
  +    if isinstance(indexes, int):
  +        indexes = [indexes]
  +
       for x, y in xy:
           r, c = index(x, y)
           window = ((r, r+1), (c, c+1))
  
verification_info: {"golden_diff": "diff --git a/rasterio/sample.py b/rasterio/sample.py\n--- a/rasterio/sample.py\n+++ b/rasterio/sample.py\n@@ -3,6 +3,10 @@\n def sample_gen(dataset, xy, indexes=None):\n     index = dataset.index\n     read = dataset.read\n+\n+    if isinstance(indexes, int):\n+        indexes = [indexes]\n+\n     for x, y in xy:\n         r, c = index(x, y)\n         window = ((r, r+1), (c, c+1))\n", "issue": "Single int indexes param in sample method\nAccording to docs the `indexes` param in the `sample` method can be a \"list of ints or a single int\".\n\nHowever passing a single int raises this exception: `IndexError: too many indices for array`.\n\n", "before_files": [{"content": "# Workaround for issue #378. A pure Python generator.\n\ndef sample_gen(dataset, xy, indexes=None):\n    index = dataset.index\n    read = dataset.read\n    for x, y in xy:\n        r, c = index(x, y)\n        window = ((r, r+1), (c, c+1))\n        data = read(indexes, window=window, masked=False, boundless=True)\n        yield data[:,0,0]\n", "path": "rasterio/sample.py"}]}