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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 docstring_section_lines(docstring, section_name):
 """ Return a section of a numpydoc string Paramters --------- docstring : str Docstring section_name : str Name of section to return Returns ------- section : str Section minus the header """

    lines = []
    inside_section = False
    underline = '-' * len(section_name)
    expect_underline = False
    for line in docstring.splitlines():
        _line = line.strip().lower()

        if expect_underline:
            expect_underline = False
            if _line == underline:
                inside_section = True
                continue

        if _line == section_name:
            expect_underline = True
        elif _line in DOCSTRING_SECTIONS:
            # next section
            break
        elif inside_section:
            lines.append(line)
    return '\n'.join(lines)