prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  collection.keys returns data objects
  should return names, but get objects
  
  </issue>
  <code>
  [start of WrightTools/collection/_collection.py]
  1 """Collection."""
  2 
  3 
  4 # --- import --------------------------------------------------------------------------------------
  5 
  6 
  7 import os
  8 import shutil
  9 
  10 import numpy as np
  11 
  12 import h5py
  13 
  14 from .. import data as wt_data
  15 from .._base import Group
  16 
  17 
  18 # --- define --------------------------------------------------------------------------------------
  19 
  20 
  21 __all__ = ['Collection']
  22 
  23 
  24 # --- classes -------------------------------------------------------------------------------------
  25 
  26 
  27 class Collection(Group):
  28     """Nestable Collection of Data objects."""
  29     class_name = 'Collection'
  30 
  31     def __iter__(self):
  32         self.__n = 0
  33         return self
  34 
  35     def __len__(self):
  36         return len(self.item_names)
  37 
  38     def __next__(self):
  39         if self.__n < len(self):
  40             out = self[self.__n]
  41             self.__n += 1
  42         else:
  43             raise StopIteration
  44         return out
  45 
  46     def __repr__(self):
  47         return '<WrightTools.Collection \'{0}\' {1} at {2}>'.format(self.natural_name,
  48                                                                     self.item_names,
  49                                                                     '::'.join([self.filepath,
  50                                                                                self.name]))
  51 
  52     def __getitem__(self, key):
  53         if isinstance(key, int):
  54             key = self.item_names[key]
  55         out = h5py.Group.__getitem__(self, key)
  56         if 'class' in out.attrs.keys():
  57             if out.attrs['class'] == 'Data':
  58                 return wt_data.Data(filepath=self.filepath, parent=self.name, name=key,
  59                                     edit_local=True)
  60             elif out.attrs['class'] == 'Collection':
  61                 return Collection(filepath=self.filepath, parent=self.name, name=key,
  62                                   edit_local=True)
  63             else:
  64                 return Group(filepath=self.filepath, parent=self.name, name=key,
  65                               edit_local=True)
  66         else:
  67             return out
  68 
  69     def __setitem__(self, key, value):
  70         raise NotImplementedError
  71 
  72     @property
  73     def item_names(self):
  74         if 'item_names' not in self.attrs.keys():
  75             self.attrs['item_names'] = np.array([], dtype='S')
  76         return [s.decode() for s in self.attrs['item_names']]
  77 
  78     def create_collection(self, name='collection', position=None, **kwargs):
  79         collection = Collection(filepath=self.filepath, parent=self.name, name=name,
  80                                 edit_local=True, **kwargs)
  81         if position is None:
  82             self._items.append(collection)
  83             self.attrs['item_names'] = np.append(self.attrs['item_names'],
  84                                                  collection.natural_name.encode())
  85         else:
  86             self._items.insert(position, collection)
  87             self.attrs['item_names'] = np.insert(self.attrs['item_names'], position,
  88                                                  collection.natural_name.encode())
  89         setattr(self, name, collection)
  90         return collection
  91 
  92     def create_data(self, name='data', position=None, **kwargs):
  93         data = wt_data.Data(filepath=self.filepath, parent=self.name, name=name, edit_local=True,
  94                             **kwargs)
  95         if position is None:
  96             self._items.append(data)
  97             self.attrs['item_names'] = np.append(self.attrs['item_names'],
  98                                                  data.natural_name.encode())
  99         else:
  100             self._items.insert(position, data)
  101             self.attrs['item_names'] = np.insert(self.attrs['item_names'], position,
  102                                                  data.natural_name.encode())
  103         setattr(self, name, data)
  104         return data
  105 
  106     def index(self):
  107         raise NotImplementedError
  108 
  109     def flush(self):
  110         for item in self._items:
  111             item.flush()
  112         self.file.flush()
  113 
  114     def save(self, filepath=None, verbose=True):
  115         # TODO: documentation
  116         self.flush()  # ensure all changes are written to file
  117         if filepath is None:
  118             filepath = os.path.join(os.getcwd(), self.natural_name + '.wt5')
  119         elif len(os.path.basename(filepath).split('.')) == 1:
  120             filepath += '.wt5'
  121         filepath = os.path.expanduser(filepath)
  122         shutil.copyfile(src=self.filepath, dst=filepath)
  123         if verbose:
  124             print('file saved at', filepath)
  125         return filepath
  126
  [end of WrightTools/collection/_collection.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/WrightTools/collection/_collection.py b/WrightTools/collection/_collection.py
  --- a/WrightTools/collection/_collection.py
  +++ b/WrightTools/collection/_collection.py
  @@ -37,7 +37,7 @@
   
       def __next__(self):
           if self.__n < len(self):
  -            out = self[self.__n]
  +            out = self.item_names[self.__n]
               self.__n += 1
           else:
               raise StopIteration
  
verification_info: {"golden_diff": "diff --git a/WrightTools/collection/_collection.py b/WrightTools/collection/_collection.py\n--- a/WrightTools/collection/_collection.py\n+++ b/WrightTools/collection/_collection.py\n@@ -37,7 +37,7 @@\n \n     def __next__(self):\n         if self.__n < len(self):\n-            out = self[self.__n]\n+            out = self.item_names[self.__n]\n             self.__n += 1\n         else:\n             raise StopIteration\n", "issue": "collection.keys returns data objects\nshould return names, but get objects\n", "before_files": [{"content": "\"\"\"Collection.\"\"\"\n\n\n# --- import --------------------------------------------------------------------------------------\n\n\nimport os\nimport shutil\n\nimport numpy as np\n\nimport h5py\n\nfrom .. import data as wt_data\nfrom .._base import Group\n\n\n# --- define --------------------------------------------------------------------------------------\n\n\n__all__ = ['Collection']\n\n\n# --- classes -------------------------------------------------------------------------------------\n\n\nclass Collection(Group):\n    \"\"\"Nestable Collection of Data objects.\"\"\"\n    class_name = 'Collection'\n\n    def __iter__(self):\n        self.__n = 0\n        return self\n\n    def __len__(self):\n        return len(self.item_names)\n\n    def __next__(self):\n        if self.__n < len(self):\n            out = self[self.__n]\n            self.__n += 1\n        else:\n            raise StopIteration\n        return out\n\n    def __repr__(self):\n        return '<WrightTools.Collection \\'{0}\\' {1} at {2}>'.format(self.natural_name,\n                                                                    self.item_names,\n                                                                    '::'.join([self.filepath,\n                                                                               self.name]))\n\n    def __getitem__(self, key):\n        if isinstance(key, int):\n            key = self.item_names[key]\n        out = h5py.Group.__getitem__(self, key)\n        if 'class' in out.attrs.keys():\n            if out.attrs['class'] == 'Data':\n                return wt_data.Data(filepath=self.filepath, parent=self.name, name=key,\n                                    edit_local=True)\n            elif out.attrs['class'] == 'Collection':\n                return Collection(filepath=self.filepath, parent=self.name, name=key,\n                                  edit_local=True)\n            else:\n                return Group(filepath=self.filepath, parent=self.name, name=key,\n                              edit_local=True)\n        else:\n            return out\n\n    def __setitem__(self, key, value):\n        raise NotImplementedError\n\n    @property\n    def item_names(self):\n        if 'item_names' not in self.attrs.keys():\n            self.attrs['item_names'] = np.array([], dtype='S')\n        return [s.decode() for s in self.attrs['item_names']]\n\n    def create_collection(self, name='collection', position=None, **kwargs):\n        collection = Collection(filepath=self.filepath, parent=self.name, name=name,\n                                edit_local=True, **kwargs)\n        if position is None:\n            self._items.append(collection)\n            self.attrs['item_names'] = np.append(self.attrs['item_names'],\n                                                 collection.natural_name.encode())\n        else:\n            self._items.insert(position, collection)\n            self.attrs['item_names'] = np.insert(self.attrs['item_names'], position,\n                                                 collection.natural_name.encode())\n        setattr(self, name, collection)\n        return collection\n\n    def create_data(self, name='data', position=None, **kwargs):\n        data = wt_data.Data(filepath=self.filepath, parent=self.name, name=name, edit_local=True,\n                            **kwargs)\n        if position is None:\n            self._items.append(data)\n            self.attrs['item_names'] = np.append(self.attrs['item_names'],\n                                                 data.natural_name.encode())\n        else:\n            self._items.insert(position, data)\n            self.attrs['item_names'] = np.insert(self.attrs['item_names'], position,\n                                                 data.natural_name.encode())\n        setattr(self, name, data)\n        return data\n\n    def index(self):\n        raise NotImplementedError\n\n    def flush(self):\n        for item in self._items:\n            item.flush()\n        self.file.flush()\n\n    def save(self, filepath=None, verbose=True):\n        # TODO: documentation\n        self.flush()  # ensure all changes are written to file\n        if filepath is None:\n            filepath = os.path.join(os.getcwd(), self.natural_name + '.wt5')\n        elif len(os.path.basename(filepath).split('.')) == 1:\n            filepath += '.wt5'\n        filepath = os.path.expanduser(filepath)\n        shutil.copyfile(src=self.filepath, dst=filepath)\n        if verbose:\n            print('file saved at', filepath)\n        return filepath\n", "path": "WrightTools/collection/_collection.py"}]}