python写的一些小功能合集(持续更新ing)

获取字典中的objkey对应的值，适用于字典嵌套

# dict:字典
# objkey:目标key
# default:找不到时返回的默认值
def dict_get(dict, objkey, default):
    for k, v in dict.items():
        if k == objkey:
            return v
        else:
            if type(v) is types.DictType:  # 如果字典的值同为字典，进行递归调用
                ret = dict_get(v, objkey, default)
                if ret is not default:
                    return ret
    return default  # 如果未找到key对应的值，返回default

# 示例
dicttest={"result":{"code":"110002","msg":"设备设备序列号或验证码错误"},'a':1}
ret=dict_get(dicttest, 'msg', None)
print(ret)

 

去除重复的字典

# items:仅包含字典的可迭代对象（tuple/list）
# key:获取字典值的规则
def dedupe(items, key=None):
    seen = set()
    for item in items:
        val = item if key is None else key(item)
        if val not in seen:
            yield item
            seen.add(val)

# 示例
a = {'x': 1, 'y': 2}, {'x': 1, 'y': 3}, {'x': 1, 'y': 2}, {'x': 2, 'y': 4}
print list(dedupe(a, key=lambda d: (d['x'],d['y'])))