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import numpy as np
from ase import Atoms, Atom
a = Atoms([Atom('Cu')])
a.positions[:] += 1.0
print(a.get_positions(), a.positions)
a = a + a
a += a
a.append(Atom('C'))
a += Atoms([])
a += Atom('H', magmom=1)
print(a.get_initial_magnetic_moments())
print(a[0].number)
print(a[[0, 1]].get_atomic_numbers())
print(a[np.array([1, 1, 0, 0, 1, 0], bool)].get_atomic_numbers())
print(a[::2].get_atomic_numbers())
print(a.get_chemical_symbols())
del a[2]
print(a.get_chemical_symbols())
del a[-2:]
print(a.get_chemical_symbols())
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