[Python] Using Azure Devops API in Python to fetch PR modified files and get the diff

I have this function of getting modified files in Azure Devops PR:

def fetch_pr_diff(pr_id):
try:
# Establish connection and get the Git client
connection = get_azure_devops_connection()
git_client = connection.clients.get_git_client()

# Retrieve pull request iterations
iterations = git_client.get_pull_request_iterations(
repository_id=repository_id,
project=project_name,
pull_request_id=pr_id
)

# Get the latest iteration
latest_iteration = max(iterations, key=lambda x: x.id)

# Fetch changes for the latest iteration
iteration_changes = git_client.get_pull_request_iteration_changes(
repository_id=repository_id,
project=project_name,
pull_request_id=pr_id,
iteration_id=latest_iteration.id
)

# Initialize the diff content
diff_content = ""

# Loop through the changes to extract diffs for each file
for change in iteration_changes.change_entries:
if change.additional_properties['item'] is not None: # Only process items with valid file information
change = change.additional_properties['item']
file_path = change['path']

# Check the change type (e.g., modified, added, deleted)
change_type = iteration_changes.change_entries[0].additional_properties['changeType']

# Process modified files
if change_type in ['edit', 'add']:
# Fetch the file content of the latest version
file_content = git_client.get_item_content(
repository_id=repository_id,
project=project_name,
path=file_path
)
file_content_ = ''.join(chunk.decode('utf-8') for chunk in file_content)
# Add file details to the diff content
diff_content += f"File: {file_path}\n"
diff_content += f"Change Type: {change_type}\n"
diff_content += f"Content:\n{file_content_}\n\n"
elif change_type == 'delete':
# If the file is deleted, just log the deletion
diff_content += f"File: {file_path}\n"
diff_content += f"Change Type: {change_type}\n"
diff_content += "Content: File deleted.\n\n"

return diff_content


the problem is that i want fetch only the modified part, and not the whole file. how can i just get the modified part between the commited file and the master? thanks!

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