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importer

ImportCache

Keeps track on and optionally caches imported items.

Handles paths in keys case-insensitively on case-insensitive OSes. Unlike dicts, this storage accepts mutable values in keys.

Source code in src/robot/running/importer.py 
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class ImportCache:
    """Keeps track on and optionally caches imported items.

    Handles paths in keys case-insensitively on case-insensitive OSes.
    Unlike dicts, this storage accepts mutable values in keys.
    """

    def __init__(self):
        self._keys = []
        self._items = []

    def __setitem__(self, key, item):
        if not isinstance(key, (str, tuple)):
            raise FrameworkError('Invalid key for ImportCache')
        key = self._norm_path_key(key)
        if key not in self._keys:
            self._keys.append(key)
            self._items.append(item)
        else:
            self._items[self._keys.index(key)] = item

    def add(self, key, item=None):
        self.__setitem__(key, item)

    def __getitem__(self, key):
        key = self._norm_path_key(key)
        if key not in self._keys:
            raise KeyError
        return self._items[self._keys.index(key)]

    def __contains__(self, key):
        return self._norm_path_key(key) in self._keys

    def values(self):
        return self._items

    def _norm_path_key(self, key):
        if self._is_path(key):
            return normpath(key, case_normalize=True)
        if isinstance(key, tuple):
            return tuple(self._norm_path_key(k) for k in key)
        return key

    def _is_path(self, key):
        return isinstance(key, str) and os.path.isabs(key) and os.path.exists(key)