如何将 Python Babel 与动态构造的字符串一起使用

Question

I'm trying to use babel to extract and update a constructed string but I still haven't found a good way to do it (without any hassle)

My current approach to construct the string:

def calculate_money(amount):
    (usd, cent) = calculate(amount)

    if not (usd or cent):
        return ''

    params = {}
    result = 'Buying this will cost you '
    if usd:
        result += '%(usd) USD'
        params['usd'] = usd
    if cent:
        if params:
            result += ' and '
        result += '%(cent) cent'
        params['cent'] = cent

    result += '.'
    return gettext(result, **params)

I know that pybabel won't extract the dynamic string, so I put this into the en.po , de.po , zh.po etc. files

msgid "Buying this will cost you %(usd) USD."
msgstr ""

msgid "Buying this will cost you %(cent) cent."
msgstr ""

msgid "Buying this will cost you %(usd) USD and %(cent) cent."
msgstr ""

But when I run

pybabel update -i messages.pot -d translations --previous

It put my precious msgid parts into comments with #~ !

Could you help me to find a better way to handle this specific usecase? Many thanks and hugs in advance!

Answer 1

Try this

po catalog entry:

msgid = 'Buying this will cost you %s USD'

python:

result += {{ _("Buying this will cost you (%s) USD" % usd) }}