[Python] My git operation through GitPython results in the same file be treated as completely...

I'm working on a script that clone a project, modify the specific file, and then make a git push. Currently I'm encountering a problem that when I'm trying to update the content of the file, git will treat the whole file as a complete diff from the original file. I'm wondering whether that's the problem with my git operations or file modify strategy. Here's my code:

def main():
print("开始处理本地仓库...")
try:
repo = Repo.clone_from(AUTH_REPO_URL, LOCAL_REPO_PATH, branch=SOURCE_BRANCH)

repo.git.checkout(SOURCE_BRANCH)

target_path = os.path.join(LOCAL_REPO_PATH, TARGET_FILE)

if os.path.isfile(target_path):
with open(target_path, 'r', encoding='utf-8') as f:
original_content = f.read()

repo.git.checkout('-b', TARGET_BRANCH)

modify_file(target_path)


with repo.config_writer() as config:
config.set_value("user", "name", "Automation Script")
config.set_value("user", "email", "automation@example.com")


if repo.is_dirty():
repo.index.add([TARGET_FILE])

repo.index.commit(COMMIT_MSG)

origin = repo.remote(name="origin")
origin.push(TARGET_BRANCH)
else:
origin = repo.remote(name="origin")
origin.push(TARGET_BRANCH)

except git.exc.GitCommandError as e:
print(f"❌ {str(e)}")
except Exception as e:
print(f"❌ {str(e)}")
finally:
print(" Done")


def modify_file(file_path):

try:
with open(file_path, 'r', encoding='utf-8') as f:
content = f.read()
f.close()

new_content = content + "test docsss"


#AI's suggestion to keep file unchanged
import stat
original_stats = os.stat(file_path)

with open(file_path, 'r+', encoding='utf-8') as f:
f.seek(0)
f.write(new_content)
f.truncate()

os.chmod(file_path, original_stats.st_mode)
os.utime(file_path, (original_stats.st_atime, original_stats.st_mtime))


return True

except Exception as e:
...




Any answers are appreciated!

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