从字典中删除词条

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}
if "key2" in my_dict:
    del my_dict["key2"]

Map<String, String> myMap = new HashMap<>();
myMap.put("key1", "value1");
myMap.put("key2", "value2");
myMap.put("key3", "value3");
if (myMap.containsKey("key2")) {
    myMap.remove("key2");
}

std::map<std::string, std::string> myMap;
myMap["key1"] = "value1";
myMap["key2"] = "value2";
myMap["key3"] = "value3";
if (myMap.count("key2")) {
    myMap.erase("key2");
}