importjson# 定义一个Python字典data={"name":"Alice","age":25,"city":"London"}# 将数据写入JSON文件withopen("data.json","w")asfile:json.dump(data,file,indent=2)# 从JSON文件中读取数据withopen("data.json","r")asfile:loaded_data=json.load(file)# 打印加载后的数据print(loaded_data) 这...
自定义异常顾名思义就是自己去写一个异常处理器,不过也是继承python中异常的基类Exception。 from fastapi import FastAPI from fastapi import Request from fastapi.responses import JSONResponse class UnicornException(Exception): def __init__(self, name): self.name = name app = FastAPI() @app.exception...
(file) return data except FileNotFoundError: print(f"文件 {file_path} 不存在") except json.JSONDecodeError: print(f"文件 {file_path} 中的 JSON 格式错误") except Exception as e: print(f"加载文件 {file_path} 时发生错误: {e}") # 使用示例 data = load_json_to_dict('valid.json') ...
JSON解码: >>> >>>importjson>>>json.loads('["foo", {"bar":["baz", null, 1.0, 2]}]')['foo', {'bar': ['baz', None, 1.0, 2]}]>>>json.loads('"\\"foo\\bar"')'"foo\x08ar'>>>fromioimportStringIO>>>io=StringIO('["streaming API"]')>>>json.load(io)['streaming API...
json.dump json对象写入text.txt defrun2():try: file ="text.txt"a = {"name":"zhangsan","age":18}withopen(file,'w')asf: json.dump(a, f)exceptExceptionase:print(e) 当前目录下输出一个文件text.txt,内容如下 {"name":"zhangsan","age":18} ...
importjson# create function to check instance is complex or notdefcomplex_encode(object):# check using isinstance methodifisinstance(object,complex):return[object.real,object.imag]# raised error using exception handling if object is not complexraiseTypeError(repr(object) +" is not JSON serialized"...
for JSON integers (e.g. float). ``parse_constant``, if specified, will be called with one of the following strings: -Infinity, Infinity, NaN. This can be used to raise an exception if invalid JSON numbers are encountered. To use a custom ``JSONDecoder`` subclass, specify it with the...
To get a first impression of JSON, have a look at this example code: JSON hello_world.json { "greeting": "Hello, world!" } You’ll learn more about the JSON syntax later in this tutorial. For now, recognize that the JSON format is text-based. In other words, you can create JS...
步骤1：导入json模块 首先，我们需要导入Python的json模块，以便使用其提供的方法来处理JSON数据。代码如下...
但是强烈建议用户自定义一个serialVersionUID,因为默认的serialVersinUID对于class的细节非常敏感,反序列化时可能会导致InvalidClassException这个异常。 在前面我们已经新建了一个实体类SysUser实现Serializable接口,并且定义了serialVersionUID变量。 SysUser实体类