page.py 文件源码

def convertPrintParameterToInches(parameter: Union[None, int, float, str]
                                  ) -> Optional[float]:
    """Convert print parameter to inches."""
    if parameter is None:
        return None
    if isinstance(parameter, (int, float)):
        pixels = parameter
    elif isinstance(parameter, str):
        text = parameter
        unit = text[-2:].lower()
        if unit in unitToPixels:
            valueText = text[:-2]
        else:
            unit = 'px'
            valueText = text
        try:
            value = float(valueText)
        except ValueError:
            raise ValueError('Failed to parse parameter value: ' + text)
        pixels = value * unitToPixels[unit]
    else:
        raise TypeError('page.pdf() Cannot handle parameter type: ' +
                        str(type(parameter)))
    return pixels / 96