Install_package_for_language_pair shortcut function

Argos Translate
1

I just added a new function (available in the upcoming Argos Translate 1.10 release) for installing specific packages in Argos Translate. I think the current method may be a bit confusing for people.

Manual way:

import argostranslate.package
import argostranslate.translate

from_code = "en"
to_code = "es"

# Download and install Argos Translate package
argostranslate.package.update_package_index()
available_packages = argostranslate.package.get_available_packages()
package_to_install = next(
    filter(
        lambda x: x.from_code == from_code and x.to_code == to_code, available_packages
    )
)
argostranslate.package.install_from_path(package_to_install.download())

# Translate
translatedText = argostranslate.translate.translate("Hello World", from_code, to_code)
print(translatedText)
# '¡Hola Mundo!'

New Shortcut:

import argostranslate.package
import argostranslate.translate

from_code = "en"
to_code = "es"

# Download and install Argos Translate package
argostranslate.package.update_package_index()
argostranslate.package.install_package_for_language_pair(from_code, to_code)

# Translate
translatedText = argostranslate.translate.translate("Hello World", from_code, to_code)
print(translatedText)
# '¡Hola Mundo!'
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