#defining a function #the keyword 'def' introduces a function definition #the function name follows #parenthesis follow the name and include within these are the parameters #the following statements must be indented def fib(n): # write Fibonacci series up to n """Print a Fibonacci series up to n.""" a, b = 0, 1 while a < n: print a, a, b = b, a+b #call the function we just defined: fib(2000) print'' #renaming a function f = fib f(10) print'' #function example 2 def fib2(n): # return Fibonacci series up to n """Return a list containing the Fibonacci series up to n.""" result = [] a, b = 0, 1 while a < n: result.append(a) # adds the value of a to the end of the result[] List a, b = b, a+b return result # return outputs the value of a function. without an expression after return, the ouput = None fib_res = fib2(100) print fib_res
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