要对同一仓库下同一change ID的不同分支的改动进行比较，并给出差异提示和内容，您可以使用Gerrit REST API来获取特定变更的不同版本，并使用Python的difflib库来比较它们的差异。以下是一个示例代码：

import requests
import difflib

# Gerrit REST API endpoint
api_url = 'https://your-gerrit-instance.com/a/changes/'

# Your Gerrit username and password
username = 'your_username'
password = 'your_password'

# Function to authenticate with Gerrit and get a session cookie
def authenticate():
    auth = (username, password)
    response = requests.get(api_url, auth=auth)
    return response.cookies

# Function to fetch different revisions of a change
def fetch_revisions(change_id):
    revisions_url = api_url + '{}/revisions/'.format(change_id)
    response = requests.get(revisions_url, cookies=authenticate())
    revisions = response.json()
    return revisions

# Function to compare revisions and print differences
def compare_revisions(revisions):
    if len(revisions) > 1:
        for i in range(1, len(revisions)):
            old_revision = revisions[i - 1]['commit']['commit']
            new_revision = revisions[i]['commit']['commit']

            # Fetching content of old and new revisions
            old_content = fetch_content(old_revision)
            new_content = fetch_content(new_revision)

            # Comparing the content using difflib
            differ = difflib.Differ()
            diff = list(differ.compare(old_content.splitlines(), new_content.splitlines()))

            # Printing differences
            print("Differences between revision {} and revision {}:".format(i, i + 1))
            print('\n'.join(diff))
    else:
        print("Only one revision found for the change.")

# Function to fetch content of a revision
def fetch_content(revision):
    revision_url = api_url + '{}/content'.format(revision)
    response = requests.get(revision_url, cookies=authenticate())
    content = response.text
    return content

# Main function
def main():
    change_id = 'your_change_id'  # Change ID to compare revisions
    revisions = fetch_revisions(change_id)
    compare_revisions(revisions)

if __name__ == "__main__":
    main()

请确保替换示例代码中的以下内容：

• api_url：您的Gerrit实例的API URL。
• username和password：您的Gerrit用户名和密码。
• change_id：您要比较的变更的ID。

要在比对没有差异后，分别对各分支进行审阅（+1或+2），您可以在比较完差异后，根据需要添加Gerrit审阅的代码。以下是更新后的示例代码：

import requests
import difflib

# Gerrit REST API endpoint
api_url = 'https://your-gerrit-instance.com/a/changes/'

# Your Gerrit username and password
username = 'your_username'
password = 'your_password'

# Function to authenticate with Gerrit and get a session cookie
def authenticate():
    auth = (username, password)
    response = requests.get(api_url, auth=auth)
    return response.cookies

# Function to fetch different revisions of a change
def fetch_revisions(change_id):
    revisions_url = api_url + '{}/revisions/'.format(change_id)
    response = requests.get(revisions_url, cookies=authenticate())
    revisions = response.json()
    return revisions

# Function to compare revisions and print differences
def compare_revisions(revisions):
    if len(revisions) > 1:
        for i in range(1, len(revisions)):
            old_revision = revisions[i - 1]['commit']['commit']
            new_revision = revisions[i]['commit']['commit']

            # Fetching content of old and new revisions
            old_content = fetch_content(old_revision)
            new_content = fetch_content(new_revision)

            # Comparing the content using difflib
            differ = difflib.Differ()
            diff = list(differ.compare(old_content.splitlines(), new_content.splitlines()))

            # Printing differences
            print("Differences between revision {} and revision {}:".format(i, i + 1))
            print('\n'.join(diff))

            # Reviewing the changes if there are no differences
            if not diff:
                review_change(revisions[i]['_number'], 2)  # Reviewing with +2
            else:
                print("Differences found. Manual review required.")

    else:
        print("Only one revision found for the change.")

# Function to fetch content of a revision
def fetch_content(revision):
    revision_url = api_url + '{}/content'.format(revision)
    response = requests.get(revision_url, cookies=authenticate())
    content = response.text
    return content

# Function to review a change
def review_change(change_number, score):
    review_url = api_url + '{}/review'.format(change_number)
    data = {
        "message": "Automated review message",
        "labels": {
            "Code-Review": score  # +1 or +2 based on the parameter passed
        }
    }
    response = requests.post(review_url, cookies=authenticate(), json=data)
    print("Reviewed change {}: {}".format(change_number, response.status_code))

# Main function
def main():
    change_id = 'your_change_id'  # Change ID to compare revisions
    revisions = fetch_revisions(change_id)
    compare_revisions(revisions)

if __name__ == "__main__":
    main()

在此示例中，如果比对没有差异，将自动对每个分支进行审阅。您可以根据需要调整审阅的分数（+1或+2）。