I went thru all questions raised in this topic but my case seems to be slightly different.
In different file from class below I’m importing get_pressure function. Because it’s related to main I get error:

TypeError: PressureGauge.get_pressure() missing 1 required positional argument: 'self'

Class I’m importing from:

class PressureGauge:
    def __init__(
        self,
        measurementRange = ( None, None ),
        hasDegas = False,
        deviceSupportedUnits = [ PressureGaugeUnit.MBAR ],
        debug = False
    ):
        if not isinstance(measurementRange, tuple) and not isinstance(measurementRange, list):
            raise ValueError("Measurement range has to be tuple or list with two components")
        if len(measurementRange) != 2:
            raise ValueError("Measurement range can only have two component")
        if measurementRange[0] > measurementRange[1]:
            raise ValueError("Measurement range minimum is larger than maximum")
        if len(deviceSupportedUnits) < 1:
            raise ValueError("Measurement units of device are unknown")

        self._debug = debug

        self._usesContext = False
        self._usedConnect = False

        self._supportedUnits = deviceSupportedUnits
        self._hasDegas = hasDegas

    def get_pressure(self, unit = PressureGaugeUnit.MBAR):
        if not isinstance(unit, PressureGaugeUnit):
            raise ValueError("Unit has to be one the supported pressuage gauge units")

        resp = self._get_pressure()

        if resp is None:
            return None

        if unit in resp['value']:
            return resp['value'][unit]

        # Check if we can perform the conversion from MBAR to the given unit
        if unit == PressureGaugeUnit.MBAR:
            return resp['mbar']
        elif unit == PressureGaugeUnit.TORR:
            return resp['mbar'] * 0.750062
        elif unit == PressureGaugeUnit.PASCAL:
            return resp['mbar'] * 100.0
        else:
            raise ValueError(f"Unknown unit {unit}")

How I should “wrap” whole class to avoid error?