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is_type_isbn.py
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Created
Fri, May 10, 20:20
Size
1 KB
Mime Type
text/x-python
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Sun, May 12, 20:20 (2 d)
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blob
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17601281
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R3600 invenio-infoscience
is_type_isbn.py
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## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
def
_convert_x_to_10
(
x
):
if
x
!=
'X'
:
return
int
(
x
)
else
:
return
10
def
is_type_isbn10
(
val
):
"""
Test if argument is an ISBN-10 number
Courtesy Wikipedia:
http://en.wikipedia.org/wiki/International_Standard_Book_Number
"""
val
=
val
.
replace
(
"-"
,
""
)
.
replace
(
" "
,
""
)
if
len
(
val
)
!=
10
:
return
False
r
=
sum
([(
10
-
i
)
*
(
_convert_x_to_10
(
x
))
for
i
,
x
in
enumerate
(
val
)])
return
not
(
r
%
11
)
def
is_type_isbn13
(
val
):
"""
Test if argument is an ISBN-13 number
Courtesy Wikipedia:
http://en.wikipedia.org/wiki/International_Standard_Book_Number
"""
val
=
val
.
replace
(
"-"
,
""
)
.
replace
(
" "
,
""
)
if
len
(
val
)
!=
13
:
return
False
total
=
sum
([
int
(
num
)
*
weight
for
num
,
weight
in
zip
(
val
,
(
1
,
3
)
*
6
)])
ck
=
(
10
-
total
)
%
10
return
ck
==
int
(
val
[
-
1
])
def
is_type_isbn
(
val
):
""" Test if argument is an ISBN-10 or ISBN-13 number """
return
is_type_isbn10
(
val
)
or
is_type_isbn13
(
val
)
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