1.
Localization Internationalization

2.
catgets VS gettext
1995

3.
[language[_territory][.codeset][@modifier]]
Locale
en_GB.UTF-8@variant

4.
Messages
Dates
Numbers
Currency
en_GB
Locale

5.
More about Localization
• Images
• Sound
• Video
• Cultural perception
• Taxes

6.
gettext features
• Messages
• Plural forms
• Context

7.
Django I18n tools

8.
• gettext
• Formats
• Timezones
I18n features

9.
workflow
Me InterpreterLocalized
Product
P
O
M
O

10.
from django.utils.translation import gettext_noop as _noop
from django.utils.translation import gettext as _
{
_noop(”Winnie rhyme”):
_("It's a very funny thought that, if Bears were Bees,"
"They'd build their nests at the bottom of trees."
"And that being so (if the Bees were Bears),"
"We shouldn't have to climb up all these stairs.”)
}
✪ python manage.py makemessages

11.
Portable Objects
PO files
#: main.py:3
msgid ""
"It's a very funny thought that, if Bears were Bees,"
"They'd build their nests at the bottom of trees."
"And that being so (if the Bees were Bears),"
"We shouldn't have to climb up all these stairs.”
msgstr ""

12.
Pootle Server

13.
Custom Solution
http://rannts.ru/meetups/1/l10n/
Legacy?
Customer?

14.
#: main.py:3
msgid ""
"It's a very funny thought that, if Bears were Bees,"
"They'd build their nests at the bottom of trees."
"And that being so (if the Bees were Bears),"
"We shouldn't have to climb up all these stairs.”
msgstr ""
"Если б мишки были пчёлами, то они бы нипочём, никогда ”
"и не подумали так высо́ко строить дом… Ой!"
✪ python manage.py compilemessages

15.
Provide more context
@classmethod
def get_table_caption(cls):
# Translators: Taxable or Non-Taxable Donations
return cls.prefix + _(' Donations')
#: Translators: Taxable or Non-Taxable Donations
#: source.py:3
msgid ""
"Donations"
msgstr ""
source
PO

16.
Avoid dynamic string creating
@property
def prefix(self):
if self.gov_state in ['CA', 'TX', 'FL']:
# Translators: Taxable Donations
return _('Taxable')
else:
# Translators: Non-Taxable Donations
return _('Non-Taxable')
def get_table_caption(self):
# Translators: Taxable or Non-Taxable Donations
return self.prefix + _('Donations'))
Words sequence cannot be changed

17.
What if nothing to do?
Insert right to the PO files

18.
python-babel
Flask-Babel
Same features. Both uses gettext.
babel-django

19.
Python gettext standard library
GNU gettext API
import gettext
gettext.gettext('EOD Report')

20.
More – pymorphy – pymorphy2
Русский, Белорусский, Украинский.
Морфологический анализ.
(род, число, падеж)
pymorphy-django

21.
mystem
Yandex
Морфологический анализ
cli интерфейс

22.
Informative Links
• History of GNU gettext
https://www.gnu.org/software/gettext/manual/html_node/gettext_219.html#History
https://www.w3.org/International/questions/qa-i18n.ru.php