prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  v0.43.0 requires pydantic, but is marked optional
  Attempting to start a very simple server results in:
  
  ```
  $ strawberry server app
  Traceback (most recent call last):
    File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/bin/strawberry", line 5, in <module>
      from strawberry.cli import run
    File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/__init__.py", line 1, in <module>
      from . import experimental, federation
    File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/__init__.py", line 1, in <module>
      from . import pydantic
    File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/__init__.py", line 1, in <module>
      from .error_type import error_type
    File "/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/error_type.py", line 4, in <module>
      from pydantic import BaseModel
  ModuleNotFoundError: No module named 'pydantic'
  ```
  
  Even though pyproject.toml has pydantic marked as optional: https://github.com/strawberry-graphql/strawberry/blob/master/pyproject.toml#L37
  
  app.py is:
  
  ```
  import asyncio
  
  import strawberry
  
  
  async def resolve_hello(root, info, name: str) -> str:
      await asyncio.sleep(1)
      return f"Hello {name}"
  
  
  @strawberry.type
  class Query:
      hello: str = strawberry.field(resolver=resolve_hello)
  
  
  schema = strawberry.Schema(query=Query)
  ```
  
  </issue>
  <code>
  [start of strawberry/experimental/__init__.py]
  1 from . import pydantic
  2 
  3 
  4 __all__ = ["pydantic"]
  5
  [end of strawberry/experimental/__init__.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/strawberry/experimental/__init__.py b/strawberry/experimental/__init__.py
  --- a/strawberry/experimental/__init__.py
  +++ b/strawberry/experimental/__init__.py
  @@ -1,4 +1,6 @@
  -from . import pydantic
  -
  -
  -__all__ = ["pydantic"]
  +try:
  +    from . import pydantic
  +except ImportError:
  +    pass
  +else:
  +    __all__ = ["pydantic"]
  
verification_info: {"golden_diff": "diff --git a/strawberry/experimental/__init__.py b/strawberry/experimental/__init__.py\n--- a/strawberry/experimental/__init__.py\n+++ b/strawberry/experimental/__init__.py\n@@ -1,4 +1,6 @@\n-from . import pydantic\n-\n-\n-__all__ = [\"pydantic\"]\n+try:\n+    from . import pydantic\n+except ImportError:\n+    pass\n+else:\n+    __all__ = [\"pydantic\"]\n", "issue": "v0.43.0 requires pydantic, but is marked optional\nAttempting to start a very simple server results in:\r\n\r\n```\r\n$ strawberry server app\r\nTraceback (most recent call last):\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/bin/strawberry\", line 5, in <module>\r\n    from strawberry.cli import run\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/__init__.py\", line 1, in <module>\r\n    from . import experimental, federation\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/__init__.py\", line 1, in <module>\r\n    from . import pydantic\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/__init__.py\", line 1, in <module>\r\n    from .error_type import error_type\r\n  File \"/home/ossareh/.local/share/virtualenvs/vega-IIh8dIOy/lib/python3.9/site-packages/strawberry/experimental/pydantic/error_type.py\", line 4, in <module>\r\n    from pydantic import BaseModel\r\nModuleNotFoundError: No module named 'pydantic'\r\n```\r\n\r\nEven though pyproject.toml has pydantic marked as optional: https://github.com/strawberry-graphql/strawberry/blob/master/pyproject.toml#L37\r\n\r\napp.py is:\r\n\r\n```\r\nimport asyncio\r\n\r\nimport strawberry\r\n\r\n\r\nasync def resolve_hello(root, info, name: str) -> str:\r\n    await asyncio.sleep(1)\r\n    return f\"Hello {name}\"\r\n\r\n\r\n@strawberry.type\r\nclass Query:\r\n    hello: str = strawberry.field(resolver=resolve_hello)\r\n\r\n\r\nschema = strawberry.Schema(query=Query)\r\n```\n", "before_files": [{"content": "from . import pydantic\n\n\n__all__ = [\"pydantic\"]\n", "path": "strawberry/experimental/__init__.py"}]}