def youtube(keyword=None):
    """Open youtube.

    Args:
        keyword (optional): Search word.
    """
    if keyword is None:
        web.open('https://www.youtube.com/watch?v=L_mBVT2jBFw')
    else:
        web.open(quote('https://www.youtube.com/results?search_query={}'.format(keyword), RESERVED))
def youtube ( keyword = None ) : if keyword is None : web . open ( 'https://www.youtube.com/watch?v=L_mBVT2jBFw' ) else : web . open ( quote ( 'https://www.youtube.com/results?search_query={}' . format ( keyword ) , RESERVED ) )
Open youtube.

    Args:
        keyword (optional): Search word.