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  1. #!/usr/bin/env python3
  2.  
  3. from math import gcd
  4.  
  5. class Rational(object):
  6.     def __init__(self, n, d = 1):
  7.         if d != 0:
  8.             g = gcd(abs(n), abs(d))
  9.             self.numer, self.denom = n // g, d // g
  10.         else:
  11.             raise ZeroDivisionError
  12.     def __add__(self, that):
  13.         match type(that).__name__:
  14.             case 'Rational':
  15.                 return Rational(
  16.                     self.numer * that.denom + that.numer * self.denom,\
  17.                     self.denom * that.denom
  18.                     )
  19.             case 'int':
  20.                 return Rational(self.numer + that * self.denom, self.denom)
  21.             case _:
  22.                 return NotImplemented
  23. ##        if isinstance(that, Rational):
  24. ##            return Rational(
  25. ##                self.numer * that.denom + that.numer * self.denom,\
  26. ##                self.denom * that.denom
  27. ##                )
  28. ##        elif isinstance(that, int):
  29. ##            return Rational(self.numer + that * self.denom, self.denom)
  30. ##        else:
  31. ##            return NotImplemented
  32.     def __sub__(self, that):
  33.         match type(that).__name__:
  34.             case 'Rational':
  35.                 return Rational(
  36.                     self.numer * that.denom - that.numer * self.denom,\
  37.                     self.denom * that.denom
  38.                     )
  39.             case 'int':
  40.                 return Rational(self.numer - that * self.denom, self.denom)
  41.             case _:
  42.                 return NotImplemented
  43. ##        if isinstance(that, Rational):
  44. ##            return Rational(
  45. ##                self.numer * that.denom - that.numer * self.denom,\
  46. ##                self.denom * that.denom
  47. ##                )
  48. ##        elif isinstance(that, int):
  49. ##            return Rational(self.numer - that * self.denom, self.denom)
  50. ##        else:
  51. ##            return NotImplemented
  52.     def __mul__(self, that):
  53.         match type(that).__name__:
  54.             case 'Rational':
  55.                 return Rational(self.numer * that.numer, self.denom * that.denom)
  56.             case 'int':
  57.                 return Rational(self.numer * that, self.denom)
  58.             case _:
  59.                 return NotImplemented
  60. ##        if isinstance(that, Rational):
  61. ##            return Rational(self.numer * that.numer, self.denom * that.denom)
  62. ##        elif isinstance(that, int):
  63. ##            return Rational(self.numer * that, self.denom)
  64. ##        else:
  65. ##            return NotImplemented
  66.     def __truediv__(self, that):
  67.         match type(that).__name__:
  68.             case 'Rational':
  69.                 return Rational(self.numer * that.denom, self.denom * that.numer)
  70.             case 'int':
  71.                 return Rational(self.numer, self.denom * that)
  72.             case _:
  73.                 return NotImplemented
  74. ##        if isinstance(that, Rational):
  75. ##            return Rational(self.numer * that.denom, self.denom * that.numer)
  76. ##        elif isinstance(that, int):
  77. ##            return Rational(self.numer, self.denom * that)
  78. ##        else:
  79. ##            return NotImplemented
  80.     def __repr__(self):
  81.         return f'{self.numer}/{self.denom}'
  82.  
  83. if __name__ == '__main__':
  84.     oneHalf = Rational(1, 2)
  85.     print(oneHalf)
  86.     twoThirds = Rational(2, 3)
  87.     print(twoThirds)
  88.     print(oneHalf / 7)
  89.     print(Rational(1, 2))
  90.     x = Rational(1, 3)
  91.     print(x)
  92.     y = Rational(5, 7)
  93.     print(y)
  94.     print(oneHalf + twoThirds)
  95.     y = Rational(3)
  96.     print(y)
  97.     print(Rational(66, 42))
  98.     print(oneHalf + twoThirds)
  99.     print(oneHalf + oneHalf * twoThirds)
  100.     print((oneHalf + oneHalf) * twoThirds)
  101.     print(oneHalf + (oneHalf * twoThirds))
  102.     r = Rational(2, 3)
  103.     print(r * r)
  104.     print(r * 2)
  105.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Traceback (most recent call last):
  File "/usr/lib/python3.9/py_compile.py", line 144, in compile
    code = loader.source_to_code(source_bytes, dfile or file,
  File "<frozen importlib._bootstrap_external>", line 918, in source_to_code
  File "<frozen importlib._bootstrap>", line 228, in _call_with_frames_removed
  File "./prog.py", line 13
    match type(that).__name__:
          ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.9/py_compile.py", line 150, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 13
    match type(that).__name__:
          ^
SyntaxError: invalid syntax
stdout
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Standard output is empty
https://ideone.com/VUvGC5
language:
Python 3 (python  3.12)
created:
274 days ago
visibility:
secret

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