code: def get_alias(alias):
      r"""Find an alias value with the given key.
  
      Parameters
      ----------
      alias : str
          Key for finding the alias value.
  
      Returns
      -------
      alias_value : str
          Value for the corresponding key.
  
      Examples
      --------
  
      >>> alias_value = get_alias('atr')
      >>> alias_value = get_alias('hc')
  
      """
      if alias in Alias.aliases:
          return Alias.aliases[alias]
      else:
          return None
  
file_path: AlphaPy/alphapy/alias.py
imports: import logging
  import parser
  import re
label_desc: Use image node_id 1 for calling a global function with example usage: get_alias(alias) and returns: Alias, None