[Tutor] Exception Handling

[David]

> On Mon, 29 Dec 2008 16:57:44 +0100, spir wrote:
> 
>> > On Mon, 29 Dec 2008 09:10:45 -0000
>> > "Alan Gauld" <alan.gauld at btinternet.com> wrote:
>> > 
>> > 
>>> >> "bob gailer" <bgailer at gmail.com> wrote
>>> >> 
>>>> >> > Also IMHO it is bad design to put a lot of code inside a try block.
>>>> >> > In this case the user might make a mistake on day and then is forced
>>>> >> > to reenter the year and month!
>>> >> 
>>> >> Obviously there is no absolute rule here but I disagree. One of the
>>> >> biggest advantages of try/except error handling is that it keeps the
>>> >> mess of handling errors out of the main logic of the code. This has two
>>> >> effects:
>>> >> 1) Code that is much easier to read
>>> >> 2) a lot less error handling code
> Also, I'd rather ask for the dates in one raw_input, cuts much of the 
> mess for the user (although it's a bit of extra codes)
Thank you all for the tips. Next to do is to get the dates in one 
raw_input with the correct format and to check for a valid year, month, 
and day. Here is what I have now;
#!/usr/bin/python
import time

curr_date = time.strftime("%Y %m %d", time.gmtime())
print "Please enter the date format as: ", curr_date

while True:
     yr = raw_input("\nWhat year were you born? ")
     mn = raw_input("What month were you born? ")
     dy = raw_input("What day were you born? ")
     try:
         ynum = int(time.strftime("%Y", time.gmtime())) - int(yr)
         mnum = int(time.strftime("%m", time.gmtime()))
         dnum = int(time.strftime("%d", time.gmtime()))
     except ValueError:
         print "Oops, You must enter a number!"
     else:
         mn = int(mn)
         dy = int(dy)

         if mn <= mnum:
             print "You are", ynum, "years old."
             break
         elif mn == mnum and dy < dnum:
             print "You are", ynum, "years old."
             break
         else:
             ret = int(ynum) - 1
             print "You are", ret, "years old."
             break


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