code: def find(bucket, key):
      # find prev node of this key
      node = bucket
      prev = None
      while node is not None and node.key != key:
          prev = node
          node = node.next
      return prev
  
file_path: python-java-leetcode/python/706_Design_HashMap.py
label_desc: Use image node_id 1 for calling a global function with example usage: find(bucket, key) and returns: prev