import sys running = 1 while running == 1: def mystery (n): a = 0 b = 1 while a < n: print (a) a, b = b, a + b changed = 0 while changed == 0: user = raw_input("Enter length of sequence: ") print(user) try: n = int(user) changed = 1 except ValueError: print("Not a number entered, try again.") print mystery(n) print changed = 0 while changed == 0: user = raw_input("Do you wish to continue (0/1)? ") print(user) try: z = int(user) if z == 0: sys.exit() elif z == 1: changed = 1 else: print("Invalid number entered.") except ValueError: print("Not a number entered, try again.") print
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