2.9. Modul decimal
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[zurück] | 2.9. Modul decimal |
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Mit dem Befehl dir lassen sich alle Funktionen des Moduls decimal anzeigen.
| print(dir(decimal)) | ['BasicContext', 'Clamped', 'Context', 'ConversionSyntax', 'Decimal', 'DecimalException', 'DecimalTuple', 'DefaultContext', 'DivisionByZero', 'DivisionImpossible', 'DivisionUndefined', 'ExtendedContext', 'Inexact', 'InvalidContext', 'InvalidOperation', 'Overflow', 'ROUND_05UP', 'ROUND_CEILING', 'ROUND_DOWN', 'ROUND_FLOOR', 'ROUND_HALF_DOWN', 'ROUND_HALF_EVEN', 'ROUND_HALF_UP', 'ROUND_UP', 'Rounded', 'Subnormal', 'Underflow', '_ContextManager', '_Infinity', '_Log10Memoize', '_NaN', '_NegativeInfinity', '_NegativeOne', '_One', '_SignedInfinity', '_WorkRep', '_Zero', '__all__', '__builtins__', '__doc__', '__file__', '__name__', '__package__', '_all_zeros', '_condition_map', '_convert_other', '_copy', '_dec_from_triple', '_dexp', '_div_nearest', '_dlog', '_dlog10', '_dpower', '_exact_half', '_format_align', '_iexp', '_ilog', '_log10_digits', '_log10_lb', '_namedtuple', '_nbits', '_normalize', '_numbers', '_parse_format_specifier', '_parse_format_specifier_regex', '_parser', '_rshift_nearest', '_signals', '_sqrt_nearest', 'getcontext', 'localcontext', 'setcontext'] |
Das Moduls decimal ermöglicht Berechnungen mit hoher Genauigkeit.
1/7 mit verschiedenen Genauigkeiten
| print(1.0/7.0) | 0.142857142857 |
| decimal.getcontext().prec = 20 a = decimal.Decimal(1) b = decimal.Decimal(7) c = a/b print(c) |
0.14285714285714285714 |
| decimal.getcontext().prec = 50 a = decimal.Decimal(1) b = decimal.Decimal(7) c = a/b print(c) |
0.14285714285714285714285714285714285714285714285714 |
wurzel(2)
| a = decimal.Decimal(2) b =0.5 c = decimal.Decimal(str(b)) d = a**c print(d) |
1.4142135623730950488016887242096980785696718753769 |
| print(decimal.Decimal(2).sqrt()) | 1.4142135623730950488016887242096980785696718753769 |
| print(d**2) | 1.9999999999999999999999999999999999999999999999999 |
Berechnung von e über eine Reihenentwicklung
| decimal.getcontext().prec = 100 a = decimal.Decimal(1) b = decimal.Decimal(1) for k in range(1, 70): b = b*k a = a + 1 / b print(a) |
2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166428 |
| print(decimal.Decimal(1).exp()) | 2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427 |
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