"""Util functions for development tools."""
import os


def source(file_name):
    """Export variables to environment from .env file.

    Args:
        file_name (str): filename with variables.
    """
    with open(file_name) as file:
        for line in file.readlines():
            parts = line.split('=')
            if len(parts) == 2:
                variable, value = parts
                os.environ[variable.strip()] = value.strip()