[Tutor] eval func with floating...

[Christopher King]

>     if c:
>         print *eval("float(%s)"%a)*
>     else:
>         print "error! please use -defined operators-!"
>
I would use a assert statement for more readability, like so.
*try: assert c*
*except AssertionError: print "error! please use -defined operators-!"*
else: *print *eval("float(%s)"%a)
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