[python] don't add too-many-lines disable if already exists

.gitignore

@@ -225,4 +225,4 @@ BenchmarkDotnet.Artifacts/
 packages/http-client-python/generator/test/**/generated/
 packages/http-client-python/generator/test/**/cadl-ranch-coverage.json
 !packages/http-client-python/package-lock.json
-micropip.lock
+packages/http-client-python/micropip.lock

packages/http-client-python/CHANGELOG.md

@@ -4,14 +4,19 @@
 
 ### Bug Fixes
 
-- Generate `__init__` for all DPG models to ensure stability
+- Only add linting disables for a file with too many lines if the file doesn't already disable this linter rule
+- Generate `__init__` for internal models to allow for discriminator needs
 
 ## 0.6.0
 
 ### Features
 
 - Add support for typespec namespace
 
+### Bug Fixes
+
+- Only add linting disables for a file with too many lines if the file doesn't already disable this linter rule
+
 ## 0.5.1
 
 ### Bug Fixes

packages/http-client-python/generator/pygen/black.py

@@ -60,7 +60,7 @@ def format_file(self, file: Path) -> None:
         except:
             _LOGGER.error("Error: failed to format %s", file)
             raise
-        if len(file_content.splitlines()) > 1000:
+        if len(file_content.splitlines()) > 1000 and "pylint: disable=too-many-lines" not in file_content:
             file_content = "# pylint: disable=too-many-lines\n" + file_content
         self.write_file(file, file_content)