code: def value(key):
      """
      Value in physical_constants indexed by key
  
      Parameters
      ----------
      key : Python string or unicode
          Key in dictionary `physical_constants`
  
      Returns
      -------
      value : float
          Value 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.value(u'elementary charge')
          1.6021766208e-19
  
      """
      _check_obsolete(key)
      return physical_constants[key][0]
  
file_path: catboost/contrib/python/scipy/py2/scipy/constants/codata.py
imports: from __future__ import division, print_function, absolute_import
  import warnings
  from math import pi, sqrt
label_desc: Use image node_id 3 for calling a global function with example usage: value(key) and returns: physical_constants