get_from_env#
- langchain_core.utils.env.get_from_env(key: str, env_key: str, default: str | None = None) str[source]#
Get a value from a dictionary or an environment variable.
- Parameters:
key (str) – The key to look up in the dictionary.
env_key (str) – The environment variable to look up if the key is not in the dictionary.
default (str | None) – The default value to return if the key is not in the dictionary or the environment. Defaults to None.
- Returns:
The value of the key.
- Return type:
str
- Raises:
ValueError – If the key is not in the dictionary and no default value is provided or if the environment variable is not set.