Importing a module

[snippsat]

I use IDLE Python 3.5.2 running on Windows 7.

Can give demo,can use IDLE but not a fan it at all  

In IDLE file --> New file paste in code under,save it as chaos.py(in Python 3.5 folder).

# File: chaos.py
# A simple program illustrating chaotic behavior.
def main():
    print("This program illustrates a chaotic function")
    inp = float(input("Enter a number between 0 and 1: "))
    for i in range(10):
        inp = 3.9 * inp * (1 -inp)
        print(inp)

if __name__ == '__main__':
    # Will now run as a script
    # But will not run when you import it(have to call main())
    main()

Close all(IDLE) then open:
File --> open chaos.py.
Run --> Run Module(F5)

Output:
Python 3.4.2 (v3.4.2:ab2c023a9432, Oct  6 2014, 22:15:05) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.
>>> ================================ RESTART ================================
>>> 
This program illustrates a chaotic function
Enter a number between 0 and 1: .5
0.975
0.09506250000000008
0.33549992226562525
0.8694649252590003
0.44263310911310905
0.962165255336889
0.1419727793616139
0.4750843861996143
0.9725789275369049
0.1040097132674683

>>> #Now will import it an run the same
>>> import chaos
>>> main()
This program illustrates a chaotic function
Enter a number between 0 and 1: .5
0.975
0.09506250000000008
0.33549992226562525
0.8694649252590003
0.44263310911310905
0.962165255336889
0.1419727793616139
0.4750843861996143
0.9725789275369049
0.1040097132674683
>>> 

If your using a tutorial that puts in eval() in from direct input of a user, and does not inform you of the security risks...get a new tutorial.

It's now an old book 2003 i think,and yes he use eval() in a lot places(not just in input) as he should not have done.
Had to check,has a copy of the book as pdf