added reference to float.as_integer_ratio

ex_01_03.py

@@ -1,6 +1,7 @@
 #!/usr/bin/python3
 
 import math
+import cmath
 
 def bailey_borwein_plouffe_pi(n):
 	"""
@@ -26,3 +27,16 @@ if( __name__ == "__main__"):
 	# Because ``a/b`` **cannot** return the same object as ``math.pi``,
 	# the latter was created when the module ``math`` was initialized,
 	# this will **always** evaluate to False.
+
+	# As it turns out there is also the ``float.as_integer_ratio``.
+	# Now I kind of assume that this exercise aims torward this crap.
+	# You can use this method to construct two integers that are a 
+	# fractional representation of the float.
+	#
+	# I doubt very much that there is a use case for this crap.
+	# There is the built-in module ``decimal`` that provides 
+	# a proper way of dealing with floating point arithmetics, 
+	# rounding and precision.
+	
+	a,b = math.pi.as_integer_ratio()
+	assert a/b == math.pi