<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_config_variables(repo, variables):
 """Set config variables Args: repo (git.Repo):
 repo variables (dict):
 entries of the form 'user.email': 'you@example.com' """

    with repo.config_writer() as writer:
        for k, value in variables.items():
            section, option = k.split('.')
            writer.set_value(section, option, value)
        writer.release()