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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def install_strategy_plugins(directories):
 """ Loads the given strategy plugins, which is a list of directories, a string with a single directory or a string with multiple directories separated by colon. As these plugins are globally loaded and cached by Ansible we do the same here. We could try to bind those plugins to the Api instance, but that's probably not something we'd ever have much of a use for. Call this function before using custom strategies on the :class:`Api` class. """

    if isinstance(directories, str):
        directories = directories.split(':')

    for directory in directories:
        strategy_loader.add_directory(directory)