How to use the metar.Datatypes.precipitation function in metar

def test_trace():
    """How do we handle trace reports"""
    assert precipitation("0000", "IN").string() == "Trace"
    assert precipitation("0000", "IN").istrace()
    assert not precipitation("0010", "IN").istrace()

def test_trace():
    """How do we handle trace reports"""
    assert precipitation("0000", "IN").string() == "Trace"
    assert precipitation("0000", "IN").istrace()
    assert not precipitation("0010", "IN").istrace()

def test_trace():
    """How do we handle trace reports"""
    assert precipitation("0000", "IN").string() == "Trace"
    assert precipitation("0000", "IN").istrace()
    assert not precipitation("0010", "IN").istrace()

def value(self, units=None):
        """Return the precipitation in the specified units."""
        if not units:
            return self._value
        else:
            if not units.upper() in precipitation.legal_units:
                raise UnitsError("unrecognized precipitation unit: '" + units + "'")
            units = units.upper()
        if units == self._units:
            return self._value
        if self._units == "CM":
            i_value = self._value * 2.54
        else:
            i_value = self._value
        if units == "CM":
            return i_value * 2.54
        else:
            return i_value

def _handlePrecip24hrRemark(self, d):
        """
        Parse a 3-, 6- or 24-hour cumulative preciptation remark group.
        """
        value = float(d["precip"]) / 100.0
        if d["type"] == "6":
            if self.cycle in [3, 9, 15, 21]:
                self.precip_3hr = precipitation(value, "IN")
            else:
                self.precip_6hr = precipitation(value, "IN")
        else:
            self.precip_24hr = precipitation(value, "IN")

def _handlePrecip24hrRemark(self, d):
        """
        Parse a 3-, 6- or 24-hour cumulative preciptation remark group.
        """
        value = float(d["precip"]) / 100.0
        if d["type"] == "6":
            if self.cycle in [3, 9, 15, 21]:
                self.precip_3hr = precipitation(value, "IN")
            else:
                self.precip_6hr = precipitation(value, "IN")
        else:
            self.precip_24hr = precipitation(value, "IN")

self._units = "IN"
        else:
            if not units.upper() in precipitation.legal_units:
                raise UnitsError("unrecognized precipitation unit: '" + units + "'")
            self._units = units.upper()

        try:
            if value.startswith("M"):
                value = value[1:]
                gtlt = "<"
            elif value.startswith("P"):
                value = value[1:]
                gtlt = ">"
        except:
            pass
        if gtlt and gtlt not in precipitation.legal_gtlt:
            raise ValueError(
                "unrecognized greater-than/less-than symbol: '" + gtlt + "'"
            )
        self._gtlt = gtlt
        self._value = float(value)
        # In METAR world, a string of just four or three zeros denotes trace
        self._istrace = value in ["0000", "000"]

def _handlePrecip1hrRemark(self, d):
        """Parse an hourly precipitation remark group."""
        value = float(d["precip"]) / 100.0
        self.precip_1hr = precipitation(value, "IN")

def _handlePrecip24hrRemark(self, d):
        """
        Parse a 3-, 6- or 24-hour cumulative preciptation remark group.
        """
        value = float(d["precip"]) / 100.0
        if d["type"] == "6":
            if self.cycle in [3, 9, 15, 21]:
                self.precip_3hr = precipitation(value, "IN")
            else:
                self.precip_6hr = precipitation(value, "IN")
        else:
            self.precip_24hr = precipitation(value, "IN")

def _handleIceAccretionRemark(self, d):
        """
        Parse the I/ group ice accretion report.
        """
        myattr = "ice_accretion_%shr" % (d["ice_accretion_hours"],)
        value = precipitation(float(d["ice_accretion_depth"]) / 100.0, "IN")
        setattr(self, myattr, value)