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See the documentation on charts, particularly the arguments coordinates and names.

For example, you can do the following:

sage: x = U.chart(names=tuple('x_%d' % i for i in range(2*p*q)))
sage: x[:]
(x_0, x_1, x_2, x_3)
sage: x[0]
x_0

See the documentation on charts, particularly the arguments coordinates and names.

For example, you can do the following:

sage: x = U.chart(names=tuple('x_%d' % i for i in range(2*p*q)))
sage: x[:]
(x_0, x_1, x_2, x_3)
sage: x[0]
x_0

x_indices = [(i,j,k) for i in range(2) for j in range(2) for k in range(2)]
M = Manifold(len(x_indices), 'M', field='complex')
U = M.open_subset('U')
x_names = tuple('x_{}_{}_{}'.format(i,j,k) for (i,j,k) in x_indices)
x_coords = U.chart(names=x_names)
x = dict(zip(x_indices,x_coords))

sage: x[(0,0,0)]
x_0_0_0