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def function(foo):
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lang-mma
Symbol["name"]: "refers to a symbol with the specified name." $\endgroup$Evaluate[ToExpression["d"~~ToString[i]]] = 30$\endgroup$x[i]? It's not exactly what you asked for; but if you don't know you can usex[i]as a variable, which representsx[10]wheniis10, then you might not know to ask for it. $\endgroup$