import requests

​

# Define the repository details

owner = "your-username"

repo = "your-repo"

old_default = "master"  # replace with the current default branch name

new_default = "main"  # replace with the desired new default branch name

​

# Authenticate to access the GitHub API (replace with your personal access token)

headers = {

    "Authorization": "Bearer YOUR_PERSONAL_ACCESS_TOKEN"

}

​

# Get the current repository details

url = f"https://api.github.com/repos/{owner}/{repo}"

response = requests.get(url, headers=headers)

repo_details = response.json()

​

# Update the default branch setting

repo_details["default_branch"] = new_default

​

# Update the repository using the GitHub API

response = requests.patch(url, json=repo_details, headers=headers)

​

# Check the response status code to verify if the default branch was changed successfully

if response.status_code == 200:

    print("Default branch updated successfully.")

else:

    print("Failed to update the default branch.")