class_docstr: Lightweight configuration object which stores key/value pairs.
class_docstr_tok: ["Lightweight","configuration","object","which","stores","key\/value","pairs","."]
docstr: Checks whether there is an entry with the specified key.
  
  :param key: Key of entry.
  :return: True if the key is stored, false otherwise.
docstr_tok: ["Checks","whether","there","is","an","entry","with","the","specified","key",".",":","param","key",":","Key","of","entry",".",":","return",":","True","if","the","key","is","stored",",","false","otherwise","."]
code: def contains_key(self, key: str) -> bool:
      """
      Checks whether there is an entry with the specified key.
  
      :param key: Key of entry.
      :return: True if the key is stored, false otherwise.
      """
      return self._j_configuration.containsKey(key)
  
imports: from typing import Set, Dict
  from py4j.java_gateway import JavaObject
  from pyflink.java_gateway import get_gateway
  from pyflink.util.java_utils import add_jars_to_context_class_loader
label_desc: Use image node_id 15 for calling the Configuration obj's underlying member method code with example usage: obj.contains_key(key) and returns: self