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| -rw-r--r-- | Doc/library/importlib.rst | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/Doc/library/importlib.rst b/Doc/library/importlib.rst index 99bfeac..f7286d2 100644 --- a/Doc/library/importlib.rst +++ b/Doc/library/importlib.rst @@ -1719,6 +1719,29 @@ To import a Python source file directly, use the following recipe spec.loader.exec_module(module) +Implementing lazy imports +''''''''''''''''''''''''' + +The example below shows how to implement lazy imports:: + + >>> import importlib.util + >>> import sys + >>> def lazy_import(name): + ... spec = importlib.util.find_spec(name) + ... loader = importlib.util.LazyLoader(spec.loader) + ... spec.loader = loader + ... module = importlib.util.module_from_spec(spec) + ... sys.modules[name] = module + ... loader.exec_module(module) + ... return module + ... + >>> lazy_typing = lazy_import("typing") + >>> #lazy_typing is a real module object, + >>> #but it is not loaded in memory yet. + >>> lazy_typing.TYPE_CHECKING + False + + Setting up an importer '''''''''''''''''''''' |