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venv/Lib/site-packages/django/conf/urls/i18n.py

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+import functools
+
+from django.conf import settings
+from django.urls import LocalePrefixPattern, URLResolver, get_resolver, path
+from django.views.i18n import set_language
+
+
+def i18n_patterns(*urls, prefix_default_language=True):
+    """
+    Add the language code prefix to every URL pattern within this function.
+    This may only be used in the root URLconf, not in an included URLconf.
+    """
+    if not settings.USE_I18N:
+        return list(urls)
+    return [
+        URLResolver(
+            LocalePrefixPattern(prefix_default_language=prefix_default_language),
+            list(urls),
+        )
+    ]
+
+
+@functools.lru_cache(maxsize=None)
+def is_language_prefix_patterns_used(urlconf):
+    """
+    Return a tuple of two booleans: (
+        `True` if i18n_patterns() (LocalePrefixPattern) is used in the URLconf,
+        `True` if the default language should be prefixed
+    )
+    """
+    for url_pattern in get_resolver(urlconf).url_patterns:
+        if isinstance(url_pattern.pattern, LocalePrefixPattern):
+            return True, url_pattern.pattern.prefix_default_language
+    return False, False
+
+
+urlpatterns = [
+    path('setlang/', set_language, name='set_language'),
+]