<s>[INST] # Description
This function will create a new branch in the src branch of an SVN repository and then checkout that branch to a defined directory.

# Task Breakdown
1. Create an svn command to add a new branch to the repository
2. Create an svn command to switch between branches
3. Use Python codes to run these svn commands in the terminal
4. Give the ability to create and checkout a new branch from anywhere

# Step 1
svnadmin create /path/to/repository
svn mkdir ...  does svn mkdir function have the ability for a relative path?[/INST]