def find_primitive(cell, symprec=1e-5):
    """
    A primitive cell is searched in the input cell. When a primitive
    cell is found, an object of Atoms class of the primitive cell is
    returned. When not, None is returned.
    """
    lattice, positions, numbers = spg.find_primitive(cell.totuple(), symprec)
    if lattice is None:
        return None
    else:
        return Atoms(numbers=numbers,
                     scaled_positions=positions,
                     cell=lattice,
                     pbc=True)
def find_primitive ( cell , symprec = 1e-5 ) : lattice , positions , numbers = spg . find_primitive ( cell . totuple ( ) , symprec ) if lattice is None : return None else : return Atoms ( numbers = numbers , scaled_positions = positions , cell = lattice , pbc = True )
A primitive cell is searched in the input cell. When a primitive
    cell is found, an object of Atoms class of the primitive cell is
    returned. When not, None is returned.