How to use the gc3pie.gc3libs.quantity.Duration function in gc3pie

val1, val2 = val.split(':')
                val1 = int(val1)
                val2 = int(val2)
            except ValueError:
                # `val1` or `val2` cannot be converted to int
                raise ValueError("Cannot parse %r as a time duration." % val)
            raise ValueError("Duration '%s' is ambiguous:"
                             " use '%dm %ds' for %d minutes and %d seconds,"
                             " or '%dh %dm' for %d hours and %d minutes."
                             % (val,
                                val1, val2, val1, val2,
                                val1, val2, val1, val2))
        else:
            # strings like `30 seconds` can be parsed by `_Quantity._new_from_string`;
            # see http://blogs.gnome.org/jamesh/2005/06/23/overriding-class-methods-in-python/
            return super(Duration, cls)._new_from_string(val)

r'((?P[0-9]+) \s* h((ou)?rs?))? \s*'
    r'((?P[0-9]+) \s* m(in(ute)?s?))? \s*'
    r'((?P[0-9]+) \s* s(ecs?))?'
    # 3. everything else is forwarded to `_Quantity._new_from_string`
    r')',
    re.X|re.I)
_TIMESPEC_VALS = [
    # regexp group name
    # |          unit time lapse as seconds
    # |          |         corresponding `Duration` unit
    # |          |         |
    ('days1',    24*60*60, Duration.day),
    ('hours1',   60*60,    Duration.hour),
    ('minutes1', 60,       Duration.minute),
    ('secs1',    1,        Duration.s),
    ('days2',    24*60*60, Duration.day),
    ('hours2',   60*60,    Duration.hour),
    ('minutes2', 60,       Duration.minute),
    ('secs2',    1,        Duration.s),
    ]


## aliases for common units

B = Memory.B
byte = B
bytes = B

kB = Memory.kB
MB = Memory.MB
GB = Memory.GB
TB = Memory.TB

TB = Memory.TB

KiB = Memory.KiB
MiB = Memory.MiB
GiB = Memory.GiB
TiB = Memory.TiB

s = Duration.s
secs = s
seconds = s

m = Duration.m
mins = m
minutes = m

h = Duration.h
hrs = h
hours = h

d = Duration.d
days = d


## main: run tests

if "__main__" == __name__:
    import doctest
    doctest.testmod(name="quantity",
                    optionflags=doctest.NORMALIZE_WHITESPACE)

r'|'
    # 2. allow `4days 3hrs`, `1 hour 4 minutes` and abbreviations `1d 2h 4m`
    r'((?P[0-9]+) \s* d(ays?))? \s*'
    r'((?P[0-9]+) \s* h((ou)?rs?))? \s*'
    r'((?P[0-9]+) \s* m(in(ute)?s?))? \s*'
    r'((?P[0-9]+) \s* s(ecs?))?'
    # 3. everything else is forwarded to `_Quantity._new_from_string`
    r')',
    re.X|re.I)
_TIMESPEC_VALS = [
    # regexp group name
    # |          unit time lapse as seconds
    # |          |         corresponding `Duration` unit
    # |          |         |
    ('days1',    24*60*60, Duration.day),
    ('hours1',   60*60,    Duration.hour),
    ('minutes1', 60,       Duration.minute),
    ('secs1',    1,        Duration.s),
    ('days2',    24*60*60, Duration.day),
    ('hours2',   60*60,    Duration.hour),
    ('minutes2', 60,       Duration.minute),
    ('secs2',    1,        Duration.s),
    ]


## aliases for common units

B = Memory.B
byte = B
bytes = B

kB = Memory.kB

GiB = Memory.GiB
TiB = Memory.TiB

s = Duration.s
secs = s
seconds = s

m = Duration.m
mins = m
minutes = m

h = Duration.h
hrs = h
hours = h

d = Duration.d
days = d


## main: run tests

if "__main__" == __name__:
    import doctest
    doctest.testmod(name="quantity",
                    optionflags=doctest.NORMALIZE_WHITESPACE)

kB = Memory.kB
MB = Memory.MB
GB = Memory.GB
TB = Memory.TB

KiB = Memory.KiB
MiB = Memory.MiB
GiB = Memory.GiB
TiB = Memory.TiB

s = Duration.s
secs = s
seconds = s

m = Duration.m
mins = m
minutes = m

h = Duration.h
hrs = h
hours = h

d = Duration.d
days = d


## main: run tests

if "__main__" == __name__:
    import doctest
    doctest.testmod(name="quantity",

# 2. allow `4days 3hrs`, `1 hour 4 minutes` and abbreviations `1d 2h 4m`
    r'((?P[0-9]+) \s* d(ays?))? \s*'
    r'((?P[0-9]+) \s* h((ou)?rs?))? \s*'
    r'((?P[0-9]+) \s* m(in(ute)?s?))? \s*'
    r'((?P[0-9]+) \s* s(ecs?))?'
    # 3. everything else is forwarded to `_Quantity._new_from_string`
    r')',
    re.X|re.I)
_TIMESPEC_VALS = [
    # regexp group name
    # |          unit time lapse as seconds
    # |          |         corresponding `Duration` unit
    # |          |         |
    ('days1',    24*60*60, Duration.day),
    ('hours1',   60*60,    Duration.hour),
    ('minutes1', 60,       Duration.minute),
    ('secs1',    1,        Duration.s),
    ('days2',    24*60*60, Duration.day),
    ('hours2',   60*60,    Duration.hour),
    ('minutes2', 60,       Duration.minute),
    ('secs2',    1,        Duration.s),
    ]


## aliases for common units

B = Memory.B
byte = B
bytes = B

kB = Memory.kB
MB = Memory.MB

def to_timedelta(duration):
        """
        Convert a duration into a Python `datetime.timedelta` object.

        This is useful to operate on Python's `datetime.time` and
        `datetime.date` objects, which can be added or subtracted to
        `datetime.timedelta`.
        """
        return datetime.timedelta(seconds=duration.amount(Duration.s))