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It's a always a good idea using the existing functionality rather than reinventing the wheel. Without the factor $q^{1/24}$ the expansion of eta function in Sage can be expanded as follows:

from sage.modular.etaproducts import qexp_eta
N=20
qexp_eta(ZZ[['q']], N)

It's a always a good idea using the existing functionality rather than reinventing the wheel. Without the factor $q^{1/24}$ the expansion of eta function in Sage can be expanded computed as follows:

from sage.modular.etaproducts import qexp_eta
N=20
qexp_eta(ZZ[['q']], N)