prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  ModuleNotFoundError: No module named 'plasmapy.classes' on plasmapy import
  On importing freshly installed plasmapy into a new environment:
  
      (plasmapy) [~]$ python
      Python 3.6.2 |Continuum Analytics, Inc.| (default, Jul 20 2017, 13:51:32) 
      [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
      Type "help", "copyright", "credits" or "license" for more information.
      >>> import plasmapy
      Traceback (most recent call last):
        File "<stdin>", line 1, in <module>
        File "/home/dominik/.anaconda3/envs/plasmapy/lib/python3.6/site-packages/plasmapy/__init__.py", line 8, in <module>
          from .classes import Plasma
      ModuleNotFoundError: No module named 'plasmapy.classes'
  
  The goal of this one is being able to import plasmapy. At all.
  
  The issue likely lies in `plasmapy/__init__.py`. 
  
  To quote @cadair 's words of encouragement on this bugfixing journey, *packaging is a special kind of hell*. 
  
  </issue>
  <code>
  [start of setup.py]
  1 from setuptools import setup
  2 
  3 
  4 # Package metadata
  5 metadata = {}
  6 with open('plasmapy/_metadata.py', 'r') as metadata_file:
  7     exec(metadata_file.read(), metadata)
  8 
  9 # Requirements
  10 with open('requirements/base.txt', 'r') as req_file:
  11     requirements = req_file.read().splitlines()
  12 
  13 setup(name=metadata['name'],
  14       version=metadata['version'],
  15       description="Python package for plasma physics",
  16       requires=requirements,
  17       install_requires=requirements,
  18       provides=[metadata['name']],
  19       author=metadata['author'],
  20       author_email="namurphy@cfa.harvard.edu",  # until we get an email address
  21       license="BSD",
  22       url="https://github.com/PlasmaPy/PlasmaPy",  # until we make a webpage
  23       long_description=metadata['description'],
  24       keywords=['plasma', 'plasma physics', 'science'],
  25       classifiers=[
  26         'Intended Audience :: Science/Research',
  27         'License :: OSI Approved :: BSD License',
  28         'Operating System :: OS Independent',
  29         'Programming Language :: Python :: 3 :: Only',
  30         'Programming Language :: Python :: 3.6',
  31         'Topic :: Scientific/Engineering :: Physics',
  32         'Topic :: Scientific/Engineering :: Astronomy',
  33         'Development Status :: 2 - Pre-Alpha',
  34         ],
  35       packages=["plasmapy"],
  36       zip_safe=False,
  37       use_2to3=False,
  38       python_requires='>=3.6',
  39       )
  40
  [end of setup.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/setup.py b/setup.py
  --- a/setup.py
  +++ b/setup.py
  @@ -1,4 +1,4 @@
  -from setuptools import setup
  +from setuptools import setup, find_packages
   
   
   # Package metadata
  @@ -32,7 +32,7 @@
           'Topic :: Scientific/Engineering :: Astronomy',
           'Development Status :: 2 - Pre-Alpha',
           ],
  -      packages=["plasmapy"],
  +      packages=find_packages(),
         zip_safe=False,
         use_2to3=False,
         python_requires='>=3.6',
  
verification_info: {"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -1,4 +1,4 @@\n-from setuptools import setup\n+from setuptools import setup, find_packages\n \n \n # Package metadata\n@@ -32,7 +32,7 @@\n         'Topic :: Scientific/Engineering :: Astronomy',\n         'Development Status :: 2 - Pre-Alpha',\n         ],\n-      packages=[\"plasmapy\"],\n+      packages=find_packages(),\n       zip_safe=False,\n       use_2to3=False,\n       python_requires='>=3.6',\n", "issue": "ModuleNotFoundError: No module named 'plasmapy.classes' on plasmapy import\nOn importing freshly installed plasmapy into a new environment:\r\n\r\n    (plasmapy) [~]$ python\r\n    Python 3.6.2 |Continuum Analytics, Inc.| (default, Jul 20 2017, 13:51:32) \r\n    [GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux\r\n    Type \"help\", \"copyright\", \"credits\" or \"license\" for more information.\r\n    >>> import plasmapy\r\n    Traceback (most recent call last):\r\n      File \"<stdin>\", line 1, in <module>\r\n      File \"/home/dominik/.anaconda3/envs/plasmapy/lib/python3.6/site-packages/plasmapy/__init__.py\", line 8, in <module>\r\n        from .classes import Plasma\r\n    ModuleNotFoundError: No module named 'plasmapy.classes'\r\n\r\nThe goal of this one is being able to import plasmapy. At all.\r\n\r\nThe issue likely lies in `plasmapy/__init__.py`. \r\n\r\nTo quote @cadair 's words of encouragement on this bugfixing journey, *packaging is a special kind of hell*. \n", "before_files": [{"content": "from setuptools import setup\n\n\n# Package metadata\nmetadata = {}\nwith open('plasmapy/_metadata.py', 'r') as metadata_file:\n    exec(metadata_file.read(), metadata)\n\n# Requirements\nwith open('requirements/base.txt', 'r') as req_file:\n    requirements = req_file.read().splitlines()\n\nsetup(name=metadata['name'],\n      version=metadata['version'],\n      description=\"Python package for plasma physics\",\n      requires=requirements,\n      install_requires=requirements,\n      provides=[metadata['name']],\n      author=metadata['author'],\n      author_email=\"namurphy@cfa.harvard.edu\",  # until we get an email address\n      license=\"BSD\",\n      url=\"https://github.com/PlasmaPy/PlasmaPy\",  # until we make a webpage\n      long_description=metadata['description'],\n      keywords=['plasma', 'plasma physics', 'science'],\n      classifiers=[\n        'Intended Audience :: Science/Research',\n        'License :: OSI Approved :: BSD License',\n        'Operating System :: OS Independent',\n        'Programming Language :: Python :: 3 :: Only',\n        'Programming Language :: Python :: 3.6',\n        'Topic :: Scientific/Engineering :: Physics',\n        'Topic :: Scientific/Engineering :: Astronomy',\n        'Development Status :: 2 - Pre-Alpha',\n        ],\n      packages=[\"plasmapy\"],\n      zip_safe=False,\n      use_2to3=False,\n      python_requires='>=3.6',\n      )\n", "path": "setup.py"}]}