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This is a known bug, tracked at

• Sage Trac ticket 27788: Make Sage reals and rationals more friendly to Python string formatting

The workaround is to convert to a float:

 print(f'{float(val):.2f}')

This is a known bug, tracked at

• Sage Trac ticket 27788: Make Sage reals and rationals more friendly to Python string formatting

The workaround is to Two workarounds exist:

• either convert to a float:

   sage: val = 12.3
  sage: print(f'{float(val):.2f}')
  

• or use a raw float from the start

  sage: val = 12.3r
  sage: print(f'{val:.2f}')