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| author | Arthur de Jong <arthur@arthurdejong.org> | 2011-08-19 10:22:13 +0200 |
|---|---|---|
| committer | Arthur de Jong <arthur@arthurdejong.org> | 2011-08-19 10:22:13 +0200 |
| commit | 881e8a6a2429b43180e1ece0148077bdb77c59d5 (patch) | |
| tree | a68cb2dc12bd38f3d73528b9bb7ec705b5fe2093 /stdnum/isbn.py | |
| parent | 8dbcedd38baa7b04ae66fd4c1908b8eb2dddc613 (diff) | |
make source code layout follow PEP8 more
git-svn-id: http://arthurdejong.org/svn/python-stdnum/python-stdnum@76 9dea7c4f-944c-4273-ac1a-574ede026edc
Diffstat (limited to 'stdnum/isbn.py')
| -rw-r--r-- | stdnum/isbn.py | 17 |
1 files changed, 12 insertions, 5 deletions
diff --git a/stdnum/isbn.py b/stdnum/isbn.py index 05f311c..d2fbe4d 100644 --- a/stdnum/isbn.py +++ b/stdnum/isbn.py @@ -47,19 +47,22 @@ def compact(number, convert=False): of any valid ISBN separators and removes surrounding whitespace. If the covert parameter is True the number is also converted to ISBN-13 format.""" - number = number.replace(' ','').replace('-','').strip().upper() + number = number.replace(' ', '').replace('-', '').strip().upper() if len(number) == 9: number = '0' + number if convert: return to_isbn13(number) return number + def _calc_isbn10_check_digit(number): """Calculate the ISBN check digit for 10-digit numbers. The number passed should not have the check bit included.""" - check = sum( (i + 1) * int(n) for i, n in enumerate(number) ) % 11 + check = sum((i + 1) * int(n) + for i, n in enumerate(number)) % 11 return 'X' if check == 10 else str(check) + def isbn_type(number): """Check the passed number and returns 'ISBN13', 'ISBN10' or None (for invalid) for checking the type of number passed.""" @@ -82,6 +85,7 @@ def isbn_type(number): else: return None + def is_valid(number): """Checks to see if the number provided is a valid ISBN (either a legacy 10-digit one or a 13-digit one). This checks the length and the check @@ -89,12 +93,13 @@ def is_valid(number): for that).""" return isbn_type(number) is not None + def to_isbn13(number): """Convert the number to ISBN-13 format.""" number = number.strip() min_number = compact(number) if len(min_number) == 13: - return number # nothing to do, already ISBN-13 + return number # nothing to do, already ISBN-13 # put new check digit in place number = number[:-1] + ean.calc_check_digit('978' + min_number[:-1]) # add prefix @@ -105,6 +110,7 @@ def to_isbn13(number): else: return '978' + number + def split(number, convert=False): """Split the specified ISBN into an EAN.UCC prefix, a group prefix, a registrant, an item number and a check-digit. If the number is in ISBN-10 @@ -121,12 +127,13 @@ def split(number, convert=False): oprefix = prefix = number[:3] number = number[3:] # split the number - result = numdb.get('isbn').split(prefix+number[:-1])[1:] + result = numdb.get('isbn').split(prefix + number[:-1])[1:] itemnr = result.pop() group = result.pop(0) if result else '' publisher = result.pop(0) if result else '' # return results - return ( oprefix, group, publisher, itemnr, number[-1] ) + return (oprefix, group, publisher, itemnr, number[-1]) + def format(number, separator='-', convert=False): """Reformat the passed number to the standard format with the EAN.UCC |