Return list of physical_constant keys containing a given string.
sub : str, unicode
Sub-string to search keys for. By default, return all keys.
disp : bool
If True, print the keys that are found, and return None. Otherwise, return the list of keys without printing anything.
keys : list or None
If disp is False, the list of keys is returned. Otherwise, None is returned.
- Contains the description of
physical_constants, which, as a dictionary literal object, does not itself possess a docstring.