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Subject: Re: problem with function
From: leonardo <tampucciolina@libero.it>
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Date: Fri, 22 Mar 2013 08:04:23 +0100
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Xref: csiph.com comp.lang.python:41684


thank you all



Il giorno 22/mar/2013, alle ore 00:20, Terry Reedy <tjreedy@udel.edu> ha =
scritto:

> On 3/21/2013 2:31 PM, leonardo selmi wrote:
>=20
>> i wrote the following code:
>>=20
>> def find(word, letter):
>>     index =3D 0
>>     while index < len(word):
>>         if word[index] =3D=3D letter:
>>             return index
>>         index =3D index + 1
>>     return -1
>=20
> Since this is a learning exercise, consider the following.
>=20
> def find(word, letter):
>    for index, let in enumerate(word):
>        if let  =3D=3D letter:
>            return index
>    return -1
>=20
> for w, l, n in (('abc', 'a', 0), ('abc', 'c', 2), ('abc', 'd', -1)):
>    assert find(w, l)  =3D=3D n
> print("no news is good news")
>=20
> I copied the code, wrote the test, ran it, and it passed. I then =
re-wrote until syntax errors were gone and the new version passed. For =
loops are specialized, easier-to-write version of while loops that scan =
the items of a collection (iterable). Learn them and use them well. =
Learn to write automated tests as soon as possible.
>=20
> --=20
> Terry Jan Reedy
>=20
> --=20
> http://mail.python.org/mailman/listinfo/python-list