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# scipy.constants.unit

`scipy.constants.``unit`(key)

  Unit in physical_constants indexed by key

  Parameters: | key : Python string or unicode Key in dictionary `physical_constants`
  Returns: | unit : Python string Unit in `physical_constants` corresponding to key

  See also

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

  Examples

      >>> from scipy import constants
      >>> constants.unit(u'proton mass')
      'kg'