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If you want to see what Sage does when you type in 12.34 into the command line, you can do

sage: preparse('12.34')

You can see that it's just passing a string version of what you type in to the global function RealNumber. Currently, that just returns a RealNumber object with 53 bits of precision. You can replace that with whatever you want. For example,

sage: R = RealField(100); R
Real Field with 100 bits of precision
sage: RealNumber = R
sage: 12.34
sage: (12.34).parent()
Real Field with 100 bits of precision