code: def discard(evolver, key):
      """Discard the element and returns a structure without the discarded elements"""
      try:
          del evolver[key]
      except KeyError:
          pass
  
file_path: catboost/contrib/python/pyrsistent/py3/pyrsistent/_transformations.py
imports: import re
label_desc: Use image node_id 3 for calling a global function with example usage: discard(evolver, key) without return types