[Tutor] string conversion and formatters

[Lloyd Kvam]

I made this change:
     elif choice == "b":
         hex_string = raw_input("Hex: ")
         hex = int(hex_string, 16)
         print "Decimal: %d" % (hex)

The raw_input is a string.  The %d print format expects an integer.
Fortunately, the int function allows you to specify the base for your string
when converting to integer.  You will get an error if you specify a base
larger than 36.

Spiffy wrote:

> Hello! I am just beginning to learn programming and
> Python. I am teaching myself using online tutorials
> and documentation. Concerning output formatters...as
> in "%d", "%s", etc. I know I have seen a listing of
> all the types somewhere in the documentation, but for
> the life of me I cannot relocate it. Where can I find
> it?
>  Now for the real question. Here is my first real
> program. It is supposed to be a decimal/hex
> convertor...
> #Decimal/Hex Convertor
> 
> def print_options():
>     print "Options:"
>     print " 'a' decimal to hex"
>     print " 'b' hex to decimal"
>     print " 'c' print options"
>     print " 'd' quit"
> 
> choice = "c"
> while choice != "d":
>     if choice == "a":
>         dec = input("Decimal: ")
>         print "Hex: %X" % (dec)
>     elif choice == "b":
>         hex = raw_input("Hex: ")
>         print "Decimal: %d" % (hex)
>     elif choice != "d":
>         print_options()
>     choice = raw_input("option: ")
>     
> If you run this program, it works fine until you try
> to convert hex to decimal. Why does this not work? I
> have tried using "string.atoi" and some other things,
> but no luck. I am stumped. Please, give me some
> explanations or hints to point me in the right
> direction...I would very much appreciate it!
> 
> By the way, I'm using Python2.2 on Windows 98.
> Thanks,
> 
>    Spiffy
> 
> 
> 
> 
> 
> 
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Lloyd Kvam
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