python · youtux · Feb 26, 2016 · Feb 27, 2016
diff --git a/stdlib/2and3/fractions.pyi b/stdlib/2and3/fractions.pyi
@@ -0,0 +1,59 @@
+from typing import overload, Union, TypeVar
+
+import numbers
+import decimal
+
+Number_ish = Union[int, float, str, numbers.Rational, decimal.Decimal]
+
+UpToComplexT = TypeVar('UpToComplexT', numbers.Rational,
+                       numbers.Real, numbers.Complex)
+UpToRealT = TypeVar('UpToRealT', numbers.Rational, numbers.Real)
+
+class Fraction(numbers.Rational):
+    @overload
+    def __init__(self, numerator: numbers.Rational = ...,
+                 denominator: numbers.Rational = ...,
+                 _normalize: bool = ...) -> None: ...
+
+    @overload
+    def __init__(self, number: Number_ish) -> None: ...
+
+    @classmethod
+    def from_float(flt: float) -> Fraction: ...
+
+    @classmethod
+    def from_decimal(dec: decimal.Decimal) -> Fraction: ...
+
+    def limit_denominator(max_denominator: int = ...) -> Fraction: ...
+
+    def __add__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __radd__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __sub__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __rsub__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __mul__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __rmul__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __truediv__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __rtruediv__(self, other: UpToComplexT) -> UpToComplexT: ...
+    def __floordiv__(self, other: UpToComplexT) -> numbers.Integral: ...
+    def __rfloordiv__(self, other: UpToComplexT) -> numbers.Integral: ...
+
+    def __mod__(self, other: UpToRealT) -> UpToRealT: ...
+    def __rmod__(self, other: UpToRealT) -> UpToRealT: ...
+
+    @overload
+    def __pow__(self, other: numbers.Integral) -> Fraction: ...
+    @overload
+    def __pow__(self, other: numbers.Complex) -> numbers.Complex: ...
+
+    def __rpow__(self, other: numbers.Complex) -> numbers.Complex: ...
+    def __pos__(self) -> Fraction: ...
+    def __neg__(self) -> Fraction: ...
+    def __abs__(self) -> Fraction: ...
+
+    # TODO: __floor__, __ceil__ and __round__ are Python 3 only
+    def __floor__(self) -> int: ...
+    def __ceil__(self) -> int: ...
+    def __round__(self, ndigits: int = ...) -> Fraction: ...
+
+
+def gcd(a: int, b: int) -> int: ...