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diff --git a/doc/fibo.py b/doc/fibo.py
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+# Fibonacci numbers demo
+
+def fib(n): # write Fibonacci series up to n
+ a, b = 0, 1
+ while b <= n:
+ print b,
+ a, b = b, a+b
+
+def fib2(n): # return Fibonacci series up to n
+ ret = []
+ a, b = 0, 1
+ while b <= n:
+ ret.append(b)
+ a, b = b, a+b
+ return ret