Commits on Sep 8, 2023

1. Blank line between nested and function def in stub files. …

   The idea behind this change is that we stop looking into previous body to determine if there should be a blank before a function or class definition.
   
   Input:
   
   ```python
   import sys
   
   if sys.version_info > (3, 7):
       class Nested1:
           assignment = 1
           def function_definition(self): ...
       def f1(self) -> str: ...
       class Nested2:
           def function_definition(self): ...
           assignment = 1
       def f2(self) -> str: ...
   
   if sys.version_info > (3, 7):
       def nested1():
           assignment = 1
           def function_definition(self): ...
       def f1(self) -> str: ...
       def nested2():
           def function_definition(self): ...
           assignment = 1
       def f2(self) -> str: ...
   ```
   
   Stable style
   ```python
   import sys
   
   if sys.version_info > (3, 7):
       class Nested1:
           assignment = 1
           def function_definition(self): ...
   
       def f1(self) -> str: ...
   
       class Nested2:
           def function_definition(self): ...
           assignment = 1
       def f2(self) -> str: ...
   
   if sys.version_info > (3, 7):
       def nested1():
           assignment = 1
           def function_definition(self): ...
   
       def f1(self) -> str: ...
       def nested2():
           def function_definition(self): ...
           assignment = 1
       def f2(self) -> str: ...
   ```
   
   In the stable formatting, we have a blank line sometimes, not depending on the previous statement on the same level, but on the last (potentially nested) statement in the previous body.
   
   psf#2783/psf#3564 fixes this for classes in preview style:
   
   ```python
   import sys
   
   if sys.version_info > (3, 7):
       class Nested1:
           assignment = 1
           def function_definition(self): ...
   
       def f1(self) -> str: ...
   
       class Nested2:
           def function_definition(self): ...
           assignment = 1
   
       def f2(self) -> str: ...
   
   if sys.version_info > (3, 7):
       def nested1():
           assignment = 1
           def function_definition(self): ...
   
       def f1(self) -> str: ...
       def nested2():
           def function_definition(self): ...
           assignment = 1
       def f2(self) -> str: ...
   ```
   
   This PR additionally fixes this for function definitions:
   
   ```python
   if sys.version_info > (3, 7):
       if sys.platform == "win32":
           assignment = 1
           def function_definition(self): ...
   
       def f1(self) -> str: ...
       if sys.platform != "win32":
           def function_definition(self): ...
           assignment = 1
   
       def f2(self) -> str: ...
   
   if sys.version_info > (3, 8):
       if sys.platform == "win32":
           assignment = 1
           def function_definition(self): ...
   
       class F1: ...
       if sys.platform != "win32":
           def function_definition(self): ...
           assignment = 1
   
       class F2: ...
   ```
   
   You can see the effect of this change on typeshed in https://github.com/konstin/typeshed/pull/1/files. As baseline, the preview mode changes without this PR are at konstin/typeshed#2.

   

   konstin committed Sep 8, 2023
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2. Update src/black/lines.py

   

   JelleZijlstra authored Sep 8, 2023
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