Return list of codata.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 : None or list
If disp is False, the list of keys is returned. Otherwise, None is returned.
See also
scipy.constants.precision
scipy.constants.C2K
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