Index: fractions.py
===================================================================
--- fractions.py	(revision 64715)
+++ fractions.py	(working copy)
@@ -138,6 +138,15 @@
         else:
             return cls(digits, 10 ** -exp)
 
+    @classmethod
+    def from_any(cls, numerator=0, denominator=1):
+        """Lossless conversion to a Fraction including decimals and floats"""
+        if denominator == 1 and isinstance(numerator, Decimal):
+            return cls.from_decimal(numerator)
+        if denominator == 1 and isinstance(numerator, float):
+            return cls.from_float(numerator)
+        return cls(numerator, denominator)
+
     def limit_denominator(self, max_denominator=1000000):
         """Closest Fraction to self with denominator at most max_denominator.