Hello,

is there a simple way to check in Sage that something is a real number in some form? That is, I am looking for a predicate which returns True on all the following things:


int(2)
ZZ(2)
float(2.3)
QQ(23/10)
RR(2.3)
RDF(2.3)
SR(2.3)
2*pi

but not on things like

"2.3"
CC(2.3, 0)
SR.symbol("x")

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