Load a PWInput object from a dictionary.
        
        Args:
            pwinput_dict (dict): dictionary with PWInput data
            
        Returns:
            PWInput object

def from_dict(cls, pwinput_dict):
        """
        Load a PWInput object from a dictionary.
        
        Args:
            pwinput_dict (dict): dictionary with PWInput data
            
        Returns:
            PWInput object
        """
        pwinput = cls(structure=Structure.from_dict(pwinput_dict['structure']),
                          pseudo=pwinput_dict['pseudo'],
                          control=pwinput_dict['sections']['control'],
                          system=pwinput_dict['sections']['system'],
                          electrons=pwinput_dict['sections']['electrons'],
                          ions=pwinput_dict['sections']['ions'],
                          cell=pwinput_dict['sections']['cell'],
                          kpoints_mode=pwinput_dict['kpoints_mode'],
                          kpoints_grid=pwinput_dict['kpoints_grid'],
                          kpoints_shift=pwinput_dict['kpoints_shift'])
        return pwinput