#### Previous topic

scipy.constants.precision

#### Next topic

scipy.constants.ConstantWarning

# scipy.constants.find

`scipy.constants.``find`(sub=None, disp=False)

  Return list of codata.physical_constant keys containing a given string.

  Parameters: | 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.
  Returns: | keys : list or None If disp is False, the list of keys is returned. Otherwise, None is returned.

  See also

  `codata`
    Contains the description of `physical_constants`, which, as a dictionary literal object, does not itself possess a docstring.