PyCharm报错 TypeError: add

下文描述的出错情况一般不太会出现，我遇到是因为在调整框架，在大量的复制粘贴中函数的调用和申明没有及时同步修改

# add_integer函数是为了描述这种出错情况写的一个简易示例
def add_integer(a, b, params):
    if params is None:
        params = {}
    if not isinstance(params, dict):
        raise ValueError("parameter 'params' must be dict.".format(type(params)))
    c = params.get("c", None)
    result = a + b
    if c is not None:
        result = result + c
    print(result)


data = {
    "c": 10
}
add_integer(3, 3, **data)

>>>C:UsersAdministratorAppDataLocalProgramsPythonPython38python.exe C:/Users/Administrator/PycharmProjects/pythonProject2/test3.py
Traceback (most recent call last):
  File "C:/Users/Administrator/PycharmProjects/pythonProject2/test3.py", line 16, in 
    add_integer(3, 3, **data)
TypeError: add_integer() got an unexpected keyword argument 'c'

Process finished with exit code 1

将add_integer声明的参数列表中的params变为可变参**params

取消调用add_integers时参数data前的双星号

在data外再封一层字典（个人感觉可以但没必要）

def add_integer(a, b, params):
    if params is None:
        params = {}
    if not isinstance(params, dict):
        raise ValueError("parameter 'params' must be dict.".format(type(params)))
    c = params.get("c", None)
    result = a + b
    if c is not None:
        result = result + c
    print(result)


data = {
    "c": 10
}
kwargs = {
    "params": data
}
add_integer(3, 3, **kwargs)


>>>C:UsersAdministratorAppDataLocalProgramsPythonPython38python.exe C:/Users/Administrator/PycharmProjects/pythonProject2/test3.py
16

Process finished with exit code 0

主要是理解在函数调用时**起解包字典对象中的元素，并将其作为关键字参数传入函数中的作用，更细致的描述可见：

(43条消息) python中的*和**_阿莫12138的博客-CSDN博客

内容如有错误，敬请指正！