1927 

  1928 _sizeunits = (('m', 2**20), ('k', 2**10), ('g', 2**30),

  1929               ('kb', 2**10), ('mb', 2**20), ('gb', 2**30), ('b', 1))

  1930 

  1931 def sizetoint(s):

  1932     '''Convert a space specifier to a byte count.

  1933 

  1934     >>> sizetoint('30')

  1935     30

  1936     >>> sizetoint('2.2kb')

  1937     2252

  1938     >>> sizetoint('6M')

  1939     6291456

  1940     '''

  1941     t = s.strip().lower()

  1942     try:

  1943         for k, u in _sizeunits:

  1944             if t.endswith(k):

  1945                 return int(float(t[:-len(k)]) * u)

  1946         return int(t)

  1947     except ValueError:

  1948         raise error.ParseError(_("couldn't parse size: %s") % s)