Source code for langchain_core.utils.env

from __future__ import annotations

import os
from typing import Any, Dict, Optional


def env_var_is_set(env_var: str) -> bool:
    """检查环境变量是否已设置。

参数：
    env_var（str）：环境变量的名称。

返回：
    bool：如果环境变量已设置，则为True，否则为False。
"""
    return env_var in os.environ and os.environ[env_var] not in (
        "",
        "0",
        "false",
        "False",
    )


def get_from_dict_or_env(
    data: Dict[str, Any], key: str, env_key: str, default: Optional[str] = None
) -> str:
    """从字典或环境变量中获取一个值。"""
    if key in data and data[key]:
        return data[key]
    else:
        return get_from_env(key, env_key, default=default)


def get_from_env(key: str, env_key: str, default: Optional[str] = None) -> str:
    """从字典或环境变量中获取一个值。"""
    if env_key in os.environ and os.environ[env_key]:
        return os.environ[env_key]
    elif default is not None:
        return default
    else:
        raise ValueError(
            f"Did not find {key}, please add an environment variable"
            f" `{env_key}` which contains it, or pass"
            f" `{key}` as a named parameter."
        )