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Just a little help to decifer a command

I need some help to decifer the following command

[u.operator()(*map(lambda v:v.log().log_expand(), u.operands())) for u in Sys0]

The problem is not the following part (*map(lambda v:v.log().log_expand(), u.operands())) I know that * unpack the u.operands() and I know lambda functions. But I find nothing in the docs on operator (there is a documentation on operators but I find nothing on operator). Then what troubles me is the syntax u.operator()().

By advance thanks for the explanation.