  BasisGen is a Python package for the automatic generation of bases of
operators in effective field theories. It accepts any semisimple symmetry group
and fields in any of its finite dimensional irreducible representations. It
takes into account integration by parts redundancy and, optionally, the use of
equations of motion. The implementation is based in well-known methods to
generate and decompose representations using roots and weights, which allow for
fast calculations, even with large numbers of fields and high-dimensional
operators. BasisGen can also be used to do some representation-theoretic
operations, such as finding the weight system of an irreducible representation
from its highest weight or decomposing a tensor product of representations.
