How to use 'how to break line in python' in Python

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def linebreaker(l,break_pt=16):
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    """
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    used for adding labels in plots.
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    :param l: list of strings
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    :param break_pt: number, insert new line after this many letters 
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    """
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    l_out=[]
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    for i in l:
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        if len(i)>break_pt:
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            i_words=i.split(' ')
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            i_out=''
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            line_len=0
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            for w in i_words:
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                line_len+=len(w)+1
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                if i_words.index(w)==0:
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                    i_out=w
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                elif line_len>break_pt:
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                    line_len=0
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                    i_out="%s\n%s" % (i_out,w)
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                else:
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                    i_out="%s %s" % (i_out,w)
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            l_out.append(i_out)    
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#             l_out.append("%s\n%s" % (i[:break_pt],i[break_pt:]))
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        else:
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            l_out.append(i)
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    return l_out