From: 7stud -- <bbxx789_05ss@...>
Date: 2009-10-06T14:42:12+09:00
Subject: Re: Ruby for the wrong reason

flebber wrote:
> Hi
> 
> A few months ago, I started learning Python - my first language for a
> project I want to do (personal) which will involve several facets
> including MySql/postgres database and gui frontend I need to create on
> windows xp. So I started this in python and I use Eric 4 ide.
> 
> At the time I had no knowledge and tossed up between Ruby and Python,
> I chose python because I thought it had been around longer so may be
> more mature.
> 
> So why Ruby now, well honestly my 3rd daughter has been born two days
> ago Ruby Jean, why would I program Python when my daughter is Ruby?
> 
> My question would Eric4 still be a good choice for Ide in Ruby, code
> completion, highlighting(syntax) and debugging would be required in
> IDE.
> 
> Secondly I found capturing the date input from a console in python to
> be a little long winded, below is the script I wrote in python would
> this be significantly easier in Ruby.
> 
> Which version of Ruby should I use 1.8.6, 1.9.1 or a preview version
> of 1.9.2?
> 
> My python script to capture date input and check for errors.
> 
> import datetime as dt
> def ObtainDate():
>     isValid=False
>     while not isValid:
>         userIn = raw_input("Type Date dd/mm/yy: ")
>         try: # strptime throws an exception if the input doesn't match
> the pattern
>             d1 = dt.datetime.strptime(userIn, "%d/%m/%y")
>             isValid=True
>             print d1, type(d1)  # 2003-07-15 00:00:00 <type
> 'datetime.datetime'>
>             "convert datetime object to a 10 character string"
>             d2 = str(d1)[:10]
>             print d2, type(d2)  # 2003-07-15 <type 'str'>
>         except:
>             print "Try again! dd/mm/yy\n"
>     Fname = "data.dat"
>     newFname = d2 + Fname
>     return newFname
> print ObtainDate()

This is a good example for you to investigate on your own.  It will 
introduce you to ruby's documentation(or lack thereof).

Here's how I would do it in python:

def get_new_fname(fname):
    while True:
        try:
            s = raw_input("Enter a date (dd/mm/yy): ")
            in_format = "%d/%m/%y"
            dt_obj = dt.datetime.strptime(s, in_format)
            break
        except ValueError:
            print "Wrong format! Try again."

    out_format = "%Y-%m-%d"
    prefix = dt_obj.strftime(out_format)

    new_fname = "%s%s" % (prefix, fname)
    return new_fname



name = "data.dat"
new_name = get_new_fname(name)
print new_name

--output:--
2009-10-05data.dat
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