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Date: Fri, 22 Feb 2013 16:09:22 +0100
Subject: Number validation issue
From: Morten Engvoldsen <mortenengv@gmail.com>
To: python-list@python.org
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Hi ,
I have wrote the below code to validate a number using modulus 10 and 11:

def is_valid_number(checknum, mod):
    if mod == 10:
        if not len(checknum) >= 2 and len(checknum) <=25:
            return False
        number = tuple(int(i) for i in reversed(str(checknum)) )
        return (sum(int(num) * 2 for num in number[1::2]) % 10) == 0
    elif mod == 11:
        if not len(checknum)!= 11:
            return False
        weights = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1]
        return (sum(w * int(x) for w, x in zip(weights, checknum)) % 11) ==
0

is_valid_number("12345678217", 10)

The above code is able to validate 25 length number for modulus 10 , but
for modulus 11 i have done the validation only for 11 digit,  Since for
modulus 11 the weight should be in
.............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1  in this format.

Could you please let me know how can i validate the 25 length number for
modulus 11 with weight ...............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3,
2, 1  in this format.

Regards,
Morten

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Hi ,<br>I have wrote the below code to validate a number using modulus 10 a=
nd 11:<br><br>def is_valid_number(checknum, mod):<br>=A0=A0=A0 if mod =3D=
=3D 10:<br>=A0=A0=A0=A0=A0=A0=A0 if not len(checknum) &gt;=3D 2 and len(che=
cknum) &lt;=3D25:<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 return False<br>
=A0=A0=A0=A0=A0=A0=A0 number =3D tuple(int(i) for i in reversed(str(checknu=
m)) )<br>=A0=A0=A0=A0=A0=A0=A0 return (sum(int(num) * 2 for num in number[1=
::2]) % 10) =3D=3D 0<br>=A0=A0=A0 elif mod =3D=3D 11:<br>=A0=A0=A0=A0=A0=A0=
=A0 if not len(checknum)!=3D 11:<br>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 retur=
n False<br>
=A0=A0=A0=A0=A0=A0=A0 weights =3D [5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1]<br>=A0=
=A0=A0=A0=A0=A0=A0 return (sum(w * int(x) for w, x in zip(weights, checknum=
)) % 11) =3D=3D 0<br><br>is_valid_number(&quot;12345678217&quot;, 10)<br><b=
r>The above code is able to validate 25 length number for modulus 10 , but =
for modulus 11 i have done the validation only for 11 digit,=A0 Since for m=
odulus 11 the weight should be in=A0 <br>
.............4,3,2,7,6, 5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1=A0 in this format.=
=A0 <br><br>Could you please let me know how can i validate the 25 length n=
umber for modulus 11 with weight ...............4,3,2,7,6, 5, 4, 3, 2, 7, 6=
, 5, 4, 3, 2, 1=A0 in this format.<br>
<br>Regards,<br>Morten <br><br><br>

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